Humans may be reversing the climate clock, by 50 million years

December 11, 2018

Future climate analogs for the years 2020, 2050, 2100 and 2200 according to three well-established models. If greenhouse gas emissions are not curbed, the study says, the climate will continue to warm until it begins to resemble the Eocene in 2100. Credit: Courtesy of the authors

Our future on Earth may also be our past.

In a study published Monday (Dec. 10, 2018) in the Proceedings of the National Academy of Sciences, researchers show that humans are reversing a long-term cooling trend tracing back at least 50 million years. And it’s taken just two centuries.

By 2030, Earth’s climate is expected to resemble that of the mid-Pliocene, going back more than 3 million years in geologic time. Without reductions in our greenhouse gas emissions, our climates by 2150 could compare to the warm and mostly ice-free Eocene, an epoch that characterized the globe 50 million years ago.

“If we think about the future in terms of the past, where we are going is uncharted territory for human society,” says the study’s lead author, Kevin Burke, who conducted the work while a graduate student in the lab of paleoecologist John “Jack” Williams, professor of geography at the University of Wisconsin-Madison. “We are moving toward very dramatic changes over an extremely rapid time frame, reversing a planetary cooling trend in a matter of centuries.”

All of the species on Earth today had an ancestor that survived the Eocene and the Pliocene, but whether humans and the flora and fauna we are familiar with can adapt to these rapid changes remains to be seen. The accelerated rate of change appears to be faster than anything life on the planet has experienced before.

The new study builds upon work Williams and colleagues first published in 2007, which compared future climate projections to historical climate data from the early 20th century. The new study relies on extensive data about climate conditions to probe much deeper in Earth’s geologic past and expand those comparisons.

“We can use the past as a yardstick to understand the future, which is so different from anything we have experienced in our lifetimes,” says Williams. “People have a hard time projecting what the world will be like five or 10 years from now. This is a tool for predicting that — how we head down those paths, and using deep geologic analogs from Earth’s history to think about changes in time.”

During the Eocene, Earth’s continents were packed more closely together and global temperatures averaged 23.4 degrees Fahrenheit (13 degrees Celsius) warmer than they are today. Dinosaurs had recently gone extinct and the first mammals, like ancestral whales and horses, were spreading across the globe. The Arctic was occupied by swampy forests like those found today in the southern U.S.

In the Pliocene, North and South America joined tectonically, the climate was arid, land bridges allowed animals to spread across continents and the Himalayas formed. Temperatures were between 3.2 and 6.5 degrees Fahrenheit (1.8 to 3.6 degrees Celsius) warmer than they are today.

For the study, Burke and Williams — along with colleagues at the University of Bristol, Columbia University, University of Leeds, NASA Goddard Institute for Space Studies and the National Center for Atmospheric Research — examined the similarities between future climate projections as set forth by the Intergovernmental Panel on Climate Change Fifth Assessment Report and several periods of geologic history.

These included the Early Eocene, the mid-Pliocene, the Last Interglacial (129 to 116 thousand years ago), the mid-Holocene (6,000 years ago), the pre-industrial era (before A.D. 1850) and the early 20th century.

They used Representative Concentration Pathway 8.5 (RCP8.5), which represents a future climate scenario in which we do not mitigate greenhouse gas emissions, and RCP4.5, a scenario in which we moderately reduce greenhouse gas emissions, and climate simulations using three different but well-established models: the Hadley Centre Coupled Model version 3, the Goddard Institute for Space Studies ModelE2-R and the Community Climate System Model.

While not without their flaws, each of these models represents the best available data and state-of-the-art techniques.

Under both scenarios and across each model, compared to previous eras, the Earth’s climate most closely resembled the mid-Pliocene by 2030 (under RCP8.5) or 2040 (under RCP4.5). Under the greenhouse gas stabilization scenario of RCP4.5, the climate then stabilizes at mid-Pliocene-like conditions, but under the higher greenhouse gas emissions of RCP8.5, the climate continues to warm until it begins to resemble the Eocene in 2100, achieving Eocene-like conditions more broadly by 2150.

The models showed these deep-geological climates emerging first from the center of continents and then expanding outward over time. Temperatures rise, precipitation increases, ice caps melt and climates become temperate near the Earth’s poles.

“Madison (Wisconsin) warms up more than Seattle (Washington) does, even though they’re at the same latitude,” Williams explains. “When you read that the world is expected to warm by 3 degrees Celsius this century, in Madison we should expect to roughly double the global average.”

The study also showed that under RCP8.5, “novel” climates emerge across nearly 9 percent of the planet. These are conditions that do not have known geologic or historical precedent and they concentrate in eastern and southeastern Asia, northern Australia and the coastal Americas.

“Based on observational data, we are tracking on the high end of the emissions scenarios, but it’s too soon to tell,” says Burke. “We may be somewhere between RCP4.5 and RCP8.5, though if we increase our climate mitigation efforts — like switching to renewable energy — we could find ourselves closer to the low end.”

About a decade ago, Swedish scientist Johan Rockström and colleagues introduced the idea of “safe operating space,” referring to the climate conditions under which modern agricultural societies developed. By comparing to the deep past, Williams and Burke say, we are able to better understand the planetary boundaries and thresholds that delineate this space.

“The further we move from the Holocene, the greater the potential that we move out of safe operating space,” says Williams, a faculty affiliate with the UW-Madison Nelson Institute Center for Climatic Research. “In the roughly 20 to 25 years I have been working in the field, we have gone from expecting climate change to happen, to detecting the effects, and now, we are seeing that it’s causing harm. People are dying, property is being damaged, we’re seeing intensified fires and intensified storms that can be attributed to climate change. There is more energy in the climate system, leading to more intense events.”

In their paper, the researchers try to strike a balance between alarm and optimism. On the one hand, Earth is headed into the unknown in our children’s and grandchildren’s lifetimes. On the other, life has long proven to be resilient. And, Williams says, in many places we are moving away from fossil fuels toward more sustainable and carbon-free energy sources. But more needs to be done.

“We’ve seen big things happen in Earth’s history — new species evolved, life persists and species survive. But many species will be lost, and we live on this planet,” says Williams. “These are things to be concerned about, so this work points us to how we can use our history and Earth’s history to understand changes today and how we can best adapt.”

Reference:
K. D. Burke, J. W. Williams, M. A. Chandler, A. M. Haywood, D. J. Lunt, B. L. Otto-Bliesner. Pliocene and Eocene provide best analogs for near-future climates. Proceedings of the National Academy of Sciences, 2018; 201809600 DOI: 10.1073/pnas.1809600115

Note: The above post is reprinted from materials provided by University of Wisconsin-Madison. Original written by Kelly April Tyrrell.

Alaska earthquakes offer new insight into improving hazard assessment

December 11, 2018

Transportable Array station P19K is one of the closest stations to the Iniskin earthquake origin. Solar panels power the station, and the seismometer is buried in a specially drilled borehole to insulate it from surface noise. Photo taken in 2017 during a service site visit by Incorporated Research Institutions for Seismology (IRIS). IRIS manages the Transportable Array station installation and maintenance. Credit: Doug Bloomquist, IRIS

The 2016 Iniskin earthquake (magnitude 7.1) that shook Anchorage, Alaska, was captured by the seismometers of the EarthScope Transportable Array. This data is helping Geoff Abers, a professor at Cornell University’s Department of Earth and Atmospheric Sciences, and Michael Mann, a graduate student in his group, explore answers to fill crucial gaps in understanding intra-slab earthquakes. Their work may provide insight into the November 30, 2018 magnitude 7.0 earthquake near Anchorage. It could also help improve earthquake hazard assessments in the future.

Intra-slab earthquakes usually occur deep in the earth, within tectonic plates descending into the mantle at subduction zones. Because they are so deep, intra-slab earthquakes can be large magnitude and felt over a broad area; however, they usually don’t exhibit strong seismic wave acceleration or ground motion since the fault causing the earthquake is deep. Iniskin was different.

The Iniskin earthquake originated within the Pacific Plate, which is slowly being forced under the North American Plate. “The Iniskin earthquake was 125 km deep, but caused some very high ground motion that was felt and recorded in Anchorage, and in particular where there’s a dense network of accelerometers. When it occurred in 2016 it was actually the strongest ground shaking in Anchorage since the great 1964 earthquake that destroyed half the town,” said Abers in early November, before the damaging earthquake of November 30. The Iniskin earthquake was more than 270 km from Anchorage.

The magnitude 7.0 earthquake that occurred on November 30 was also an intra-slab earthquake within the subducting Pacific Plate, but it was only 44 km deep and only a few miles from Anchorage. It produced extensive damage, and while initial data are still being processed, it serves as a reminder of the hazard posed by this kind of earthquake.

The Iniskin earthquake provided a prime opportunity to study the mechanics of an intra-slab earthquake, and how local geology can dramatically change the earthquake’s effects. The Iniskin earthquake rattled Anchorage shortly after seismometers from EarthScope’s Transportable Array were installed in southcentral Alaska. The Transportable Array consists of hundreds of seismic stations deployed in a grid; it has leapfrogged its way every two years across swaths of the continent for more than a decade and is currently in Alaska. The grid, with a spacing of about 85 km, covers Alaska from the southeast panhandle to the North Slope.

“We are only able to do this study because the Transportable Array installed high-quality, state-of-the-art instruments in many otherwise inaccessible places,” Mann said.

“We’ve known for some time that you occasionally do get big intra-slab earthquakes and there’s been some concern they are underrepresented globally in hazard estimates in the places in the world where they occur. So this is an opportunity to delve a little bit deeper to try to understand what was going on here,” Abers said.

What caused such unexpected movement from the Iniskin earthquake? Abers and Mann think there are two possible factors based on local geology: one is the temperature of the mantle the seismic waves travel through to reach the surface, and another is that the seismic waves can sometimes ricochet between the layers of a subducting tectonic plate.

Anchorage sits near the edge of the North American Plate, where the continental plate pushes the Pacific Plate down into the mantle. The plate from the surface is cooler, and therefore more solid, than the surrounding mantle, so seismic waves travel faster.

“At very low temperatures the earth is like a bell, it just rings and waves can propagate,” Abers said. “We could only see that for the Iniskin earthquake because the Transportable Array actually deployed stations for the first time west of Anchorage and north of the Alaska Range.”

The Transportable Array allowed a comparison of seismic waves the same distance from the source of the earthquake, but in different directions. North of the Alaska Range, where the distance from the subduction zone means the crust lies above the mantle, the seismic waves have to travel through hot mantle to get to Anchorage. The heated rock is softer and “mushier,” so seismic waves don’t travel as quickly as through cooler crust.

“Those signals are really small compared to the very large signals you’ll see in Anchorage at comparable distances, by a factor of 20 to 50 at the frequencies we care about,” said Abers. “These aren’t subtle effects.”

The other possible reason why the Iniskin earthquake shook the ground so much has to do with the local structure of the crust. Abers and Mann found that at some frequencies, seismic waves seemed to be amplified. The crust is made up of multiple layers of different kinds of rock. If a weaker layer is sandwiched between stronger layers in the sinking crust of the subduction zone, seismic waves may travel up the subducting plate and be caught in the sandwiched layer, bouncing back and forth and amplifying the wave’s energy.

“We’ve known about this problem for a while, but it hasn’t really made it into how hazards are assessed from these earthquakes very clearly, because we haven’t worked out how to determine the parameters,” said Abers. In places such as Anchorage, earthquake hazard assessment may need to include information about the deep earth, tens of miles down, and not just the near-surface geology. Puzzling out what happened during the Iniskin earthquake and possibly the November 30 one, and having good data coverage to compare the earthquakes from different locations, is a step forward for improving hazard assessment for intra-slab earthquakes in the future.

Note: The above post is reprinted from materials provided by EarthScope National Office.

The complex history of Earth’s magnetic reversals

December 11, 2018

Earth creates its own magnetic field, suggests new research. Credit: TU Wien

Throughout Earth’s long geologic history, the magnetic pole has not remained stable.

For reasons that are still little understood, the Earth’s magnetic field can suddenly – and without warning – weaken, start to shift around, and even completely reverse direction.

Records indicate that over the last 160 million years, the magnetic pole has reversed its polarity at least several hundred times. Called a “geomagnetic field reversal,” this has resulted in the poles swapping positions, with magnetic north becoming magnetic south, and vice versa. The magnetic pole has also undergone what are called “excursions.” During an excursion event, the earth’s magnetic field weakens and begins to drift but does not reverse itself. The field re-strengthens and the poles finally return to their initial position.

UC Santa Cruz geology professor Robert Coe will be presenting his paper, “What We Know and Don’t Know about Reversals” during the upcoming American Geophysical Union (AGU) meeting in Washington, D.C. this December.

Coe is an emeritus professor of geophysics, and has had a long and distinguished career. He has received numerous awards and recognition for his many research accomplishments. He received his Ph.D. at the University of California, Berkeley, and did postgraduate work in Australia before returning to the States where he joined the UC Santa Cruz faculty in 1968. He has made significant contributions in a number of areas, including volcanology, geochemistry, and tectonics. In the 1970s, he developed a method of more accurately measuring the intensity of the magnetic field in rocks – a method that bears his name. Perhaps his most significant contribution, however, has been in paleomagnetism, where he has been a pioneer in the study of magnetic field reversals.

“The Earth’s magnetic field is restless,” said Coe in a recent interview.

Evidence for this restlessness first came to light in the early twentieth century when geologists recognized that certain rocks exhibited magnetism that was different in orientation from the Earth’s then current magnetic field. While given little consideration at the time, geologists eventually acknowledged the significance of this observation and became interested in investigating the phenomenon. A number of influential papers published in the 1960s – including a number of papers authored by Coe – shed considerable light on the process by identifying polarity transitions in both lava flows and sediments.

The process by which rocks get magnetized occurs when they are formed, Coe explained. Scientists know much more about how volcanic rocks become magnetized than they do about sedimentary rocks. As igneous rocks cool, for example, they become magnetized in the direction of the field prevailing at the moment. This process may take a few days or a few years and provides a “snapshot” of the Earth’s magnetic field, he added. Consequently, by studying many different rocks formed during different geologic periods, researchers can create a record of the Earth’s history of magnetic wanderings.

One of the best records of the earth’s magnetic reversals comes from Steens Mountain in southeastern Oregon. Here, a series of overlapping Miocene-age basaltic lava flows record a complex history of several thousand years of Earth’s geomagnetic history. Significantly, the Steens Mountain record bears evidence of a complete magnetic reversal that occurred at an extraordinarily rapid pace (between 3 and 8 degrees per day) some15.5 million years ago.

Unfortunately, magnetic reversals can be far more complex than even the best, most detailed paleomagnetic record on hand. Volcanic records are limited by the “discontinuous and episodic nature of volcanic eruptions,” Coe said. To better understand Earth’s geomagnetic history, Coe emphasized, we need to have excellent records not only from volcanic contexts but also from sedimentary data.

Highly detailed deep-sea cores recently obtained during drilling operations in the North Atlantic might provide the lynchpin. These were obtained from a vertical section of the ocean floor and provide a continuous sequence of magnetized strata.

“The North Atlantic records give one hope,” Coe said.

Today, much has been learned about reversals in the Earth’s magnetic field.

It is now known, for example, that magnetic reversals happen much more frequently than previously surmised, and that they can often occur at incredibly rapid clips. It is also known that the last complete reversal, which occurred 770,000 years ago, occurred over a span of less than 100 years.

Much more, however, is still to be learned.

Most importantly, geologists continue to debate the cause of these reversals.

“A magnetic reversal certainly has a large random or chaotic aspect,” Coe said. “And it’s active over many time scales.”

Although a number of theories have been posited, the prevailing explanation suggests that reversals are ultimately tied to the Earth’s convective motion.

“The Earth’s magnetic field comes from a dynamo-like action arising from the motion of the metallic fluids in the outer core,” he said.

Scientists have also debated whether a reversal can cause major hazards, especially to technology. Some have argued that a reversal would cause the failure of the worldwide electronic and communication systems. The question, however, is controversial and remains unanswered.

Note: The above post is reprinted from materials provided by University of California – Santa Cruz.

Scientists find new giant dinosaur

December 8, 2018

Volgatitan simbirskiensis anterior caudal vertebra (holotype), in right lateral (A), anterior (B), left lateral (C), posterior (D), dorsal (E), and ventral (F) views; photographs. Credit: Alexander Averianov and Vladimir Efimov

Paleontologists from Russia have described a new dinosaur, the Volgatitan. Seven of its fossilized vertebrae, buried in the ground for about 130 million years, were found on the banks of the Volga, not far from the village of Slantsevy Rudnik, five kilometers from Ulyanovsk. The study has been published in the latest issue of Biological Communications.

The Volgatitan belongs to the group of sauropods—giant herbivorous dinosaurs with a long necks and tails, which lived about 200 to 65 million years ago. Weighing around 17 tons, the ancient reptile from the banks of the Volga was not the largest among its relatives. The scientists described it from seven caudal vertebrae. The bones belonged to an adult dinosaur characterized by neural arches (parts of the vertebrae protecting the nerves and blood vessels), which completely merged with the bodies of the vertebrae.

The remains of the dinosaur were discovered near the village of Slantsevy Rudnik. This is where, in 1982, Vladimir Efimov discovered three large vertebrae that had fallen out of a high cliff. Later, in 1984-1987, three nodules of limestone fell off, which contained the remaining vertebrae. In his works, the head of the Undorovsky Paleontology Museum called the unusual finds “giant vertebrae of unknown taxonomic affiliation.”

Alexander Averianov said, “In the early 1990s, Vladimir Efimov showed photographs of the bones to Lev Nesov, a well-known Leningrad paleontologist. Lev Nesov thought that the vertebrae belonged to sauropods, giant herbivorous dinosaurs. In 1997, Vladimir Efimov published a preliminary note about this find in the Paleontological Journal. He referred to the vertebrae as a sauropod of the Brachiosauridae family. Last July, I finally managed to visit him in Undory and study the bones, and also managed to determine that they belonged to the new taxon of titanosaurs.”

The dinosaur received a scientific name—Volgatitan simbirskiensis. It comes from the Volga River and the city of Simbirsk (currently, Ulyanovsk). Titans are ancient Greek gods known for their large size. Therefore, according to a paleontological tradition, this word is used in many scientific names of sauropods from the group of titanosaurs. It is also part of the name of the group.

Today, along with the Volgatitan from Russia, 12 valid dinosaur taxa have been described. There are only three sauropods among them: Tengrisaurus starkovi, Sibirotitan astrosacralis and Volgatitan simbirskiensis. The first two are the first sauropods in Russia, which were also studied by St. Petersburg University scientists in 2017. According to Aleksandr Averianov, the description of dinosaur taxa in recent years has become possible due to progress in understanding the anatomy and phylogeny of dinosaurs. In addition, the Russian sauropod allowed scientists to learn more about how these species of ancient reptiles had lived and developed.

“Previously, it was believed that the evolution of titanosaurs took place mainly in South America, with some taxa moving into North America, Europe and Asia only in the Late Cretaceous,” explained the St. Petersburg University professor. In Asia, representatives of a broader group of titanosauriform, such as the recently described Siberian titanium, dominated in the early Cretaceous. However, the recent description of the Tengrisaurus from the Early Cretaceous of Transbaikal Region and the finding of the Volgatitan indicate that titanosaurs in the Early Cretaceous were distributed much more widely; and, perhaps, important stages of their evolution took place in Eastern Europe and Asia.”

Reference:
et al, The oldest titanosaurian sauropod of the Northern Hemisphere, Biological Communications (2018). DOI: 10.21638/spbu03.2018.301

Note: The above post is reprinted from materials provided by AKSON Russian Science Communication Association.

Scientists discover possible mantle mineral

December 8, 2018

Scientists long believed that Earth’s lower mantle was composed of Bridgmanite (Mg,Fe)SiO3 and magnesiowüstite (Mg,Fe)O, in which Fe2+ dwells. This view changed when experiments showed that Fe2+ simply can’t exist at the pressure and temperature of the lower mantle. What is present is Fe3+. The two phases (Mg,Fe)SiO3 and (Mg,Fe)O both shed Fe2+ and, in turn, MgSiO3 and MgO remain. However, what mineral hosts Fe3+ had remained unknown.

Now, scientists have a possible answer: Maohokite, a newly discovered high-pressure mineral. It may be what composes the Earth’s lower mantle along with Bridgmanite MgSiO3 and magnesiowüstite MgO. The study reporting this new mineral was published in Meteoritics & Planetary Science.

Maohokite was discovered by Chen Ming’s team from the Guangzhou Institute of Geochemistry of the Chinese Academy of Sciences and SHU Jinfu from the Center for High Pressure Science and Technology Advanced Research. The mineral was named after Hokwang Mao, in honor of his great contribution to high-pressure research.

The mineral and its name have been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association under the designator IMA 2017-047.

Natural minerals can be divided into two types: low-pressure minerals and high-pressure minerals, depending on their formation pressures. The pressure and temperature required for the formation of high-pressure minerals can only be provided by the environment of the mantle or the hypervelocity collision between celestial bodies.

Maohokite is the second case. It was found in shock-metamorphosed rocks from the Xiuyan impact crater in China.

This high-pressure mineral was formed from the decomposition of ferromagnesian carbonate via a self-oxidation-reduction reaction at a temperature >900 degrees C and impact pressure >25 GPa (a pressure range found at depths more than 670km below Earth’s surface). In this reaction, Fe2+ oxidizes into Fe3+ and then later combines with Mg2+ to form maohokite, thus making it a possible important constituent of the lower mantle.

Maohokite, with a composition of MgFe2O4, has an orthorhombic CaFe2O4-type structure. The existing mineralogical model of the Earth’s mantle shows that the ferromagnesian lower mantle is mainly composed of Bridgmanite (Mg,Fe)SiO3 and magnesiowüstite (Mg,Fe)O. Therefore, the fact that Maohokite contains Mg and Fe, two major components of the lower mantle, only makes the case stronger that Maokohite is a key mineral in the lower mantle.

Reference:
Ming Chen et al. Maohokite, a post-spinel polymorph of MgFe2 O4 in shocked gneiss from the Xiuyan crater in China, Meteoritics & Planetary Science (2018). DOI: 10.1111/maps.13222

Note: The above post is reprinted from materials provided by Chinese Academy of Sciences.

Biggest mass extinction caused by global warming leaving ocean animals gasping for breath

December 8, 2018

This illustration shows the percentage of marine animals that went extinct at the end of the Permian era by latitude, from the model (black line) and from the fossil record (blue dots). A greater percentage of marine animals survived in the tropics than at the poles. The color of the water shows the temperature change, with red being most severe warming and yellow less warming. At the top is the supercontinent Pangaea, with massive volcanic eruptions emitting carbon dioxide. The images below the line represent some of the 96 percent of marine species that died during the event. Includes fossil drawings by Ernst Haeckel/Wikimedia; Blue crab photo by Wendy Kaveney/Flickr; Atlantic cod photo by Hans-Petter Fjeld/Wikimedia; Chambered nautilus photo by ©2010 John White/CalPhotos. Credit: Justin Penn and Curtis Deutsch/University of Washington

The largest extinction in Earth’s history marked the end of the Permian period, some 252 million years ago. Long before dinosaurs, our planet was populated with plants and animals that were mostly obliterated after a series of massive volcanic eruptions in Siberia.

Fossils in ancient seafloor rocks display a thriving and diverse marine ecosystem, then a swath of corpses. Some 96 percent of marine species were wiped out during the “Great Dying,” followed by millions of years when life had to multiply and diversify once more.

What has been debated until now is exactly what made the oceans inhospitable to life—the high acidity of the water, metal and sulfide poisoning, a complete lack of oxygen, or simply higher temperatures.

New research from the University of Washington and Stanford University combines models of ocean conditions and animal metabolism with published lab data and paleoceanographic records to show that the Permian mass extinction in the oceans was caused by global warming that left animals unable to breathe. As temperatures rose and the metabolism of marine animals sped up, the warmer waters could not hold enough oxygen for them to survive.

The study is published in the Dec. 7 issue of Science.

“This is the first time that we have made a mechanistic prediction about what caused the extinction that can be directly tested with the fossil record, which then allows us to make predictions about the causes of extinction in the future,” said first author Justin Penn, a UW doctoral student in oceanography.

Researchers ran a climate model with Earth’s configuration during the Permian, when the land masses were combined in the supercontinent of Pangaea. Before ongoing volcanic eruptions in Siberia created a greenhouse-gas planet, oceans had temperatures and oxygen levels similar to today’s. The researchers then raised greenhouse gases in the model to the level required to make tropical ocean temperatures at the surface some 10 degrees Celsius (20 degrees Fahrenheit) higher, matching conditions at that time.

The model reproduces the resulting dramatic changes in the oceans. Oceans lost about 80 percent of their oxygen. About half the oceans’ seafloor, mostly at deeper depths, became completely oxygen-free.

To analyze the effects on marine species, the researchers considered the varying oxygen and temperature sensitivities of 61 modern marine species—including crustaceans, fish, shellfish, corals and sharks—using published lab measurements. The tolerance of modern animals to high temperature and low oxygen is expected to be similar to Permian animals because they had evolved under similar environmental conditions. The researchers then combined the species’ traits with the paleoclimate simulations to predict the geography of the extinction.

“Very few marine organisms stayed in the same habitats they were living in—it was either flee or perish,” said second author Curtis Deutsch, a UW associate professor of oceanography.

The model shows the hardest hit were organisms most sensitive to oxygen found far from the tropics. Many species that lived in the tropics also went extinct in the model, but it predicts that high-latitude species, especially those with high oxygen demands, were nearly completely wiped out.

To test this prediction, co-authors Jonathan Payne and Erik Sperling at Stanford analyzed late-Permian fossil distributions from the Paleoceanography Database, a virtual archive of published fossil collections. The fossil record shows where species were before the extinction, and which were wiped out completely or restricted to a fraction of their former habitat.

The fossil record confirms that species far from the equator suffered most during the event.

“The signature of that kill mechanism, climate warming and oxygen loss, is this geographic pattern that’s predicted by the model and then discovered in the fossils,” Penn said. “The agreement between the two indicates this mechanism of climate warming and oxygen loss was a primary cause of the extinction.”

The study builds on previous work led by Deutsch showing that as oceans warm, marine animals’ metabolism speeds up, meaning they require more oxygen, while warmer water holds less. That earlier study shows how warmer oceans push animals away from the tropics.

The new study combines the changing ocean conditions with various animals’ metabolic needs at different temperatures. Results show that the most severe effects of oxygen deprivation are for species living near the poles.

“Since tropical organisms’ metabolisms were already adapted to fairly warm, lower-oxygen conditions, they could move away from the tropics and find the same conditions somewhere else,” Deutsch said. “But if an organism was adapted for a cold, oxygen-rich environment, then those conditions ceased to exist in the shallow oceans.”

The so-called “dead zones” that are completely devoid of oxygen were mostly below depths where species were living, and played a smaller role in the survival rates.”At the end of the day, it turned out that the size of the dead zones really doesn’t seem to be the key thing for the extinction,” Deutsch said. “We often think about anoxia, the complete lack of oxygen, as the condition you need to get widespread uninhabitability. But when you look at the tolerance for low oxygen, most organisms can be excluded from seawater at oxygen levels that aren’t anywhere close to anoxic.”

Warming leading to insufficient oxygen explains more than half of the marine diversity losses. The authors say that other changes, such as acidification or shifts in the productivity of photosynthetic organisms, likely acted as additional causes.

The situation in the late Permian—increasing greenhouse gases in the atmosphere that create warmer temperatures on Earth—is similar to today.

“Under a business-as-usual emissions scenarios, by 2100 warming in the upper ocean will have approached 20 percent of warming in the late Permian, and by the year 2300 it will reach between 35 and 50 percent,” Penn said. “This study highlights the potential for a mass extinction arising from a similar mechanism under anthropogenic climate change.”

Reference:
J.L. Penn el al., “Temperature-dependent hypoxia explains biogeography and severity of end-Permian marine mass extinction,” Science (2018). DOI: 10.1126/science.aat1327

Note: The above post is reprinted from materials provided by University of Washington.

Enhancing our vision of the past

December 6, 2018

A fossil trilobite with its complex eye. These ancient animals were inferred to have minimally possessed four opsins, like many modern arthropods, and should have therefore been able to see colors. Credit: University of Bristol

An international group of scientists led by researchers from the University of Bristol have advanced our understanding of how ancient animals saw the world by combining the study of fossils and genetics.

Ancestors of insects and crustaceans that lived more than 500 million years ago in the Cambrian period were some of the earliest active predators, but not much is known about how their eyes were adapted for hunting.

Work published in the Proceedings of the Royal Society B today suggests that when fossil and genetic data are assessed in tandem, previously inaccessible and exciting conclusions about long dead species can be made.

By examining the morphological characteristics of fossils’ eyes, alongside the genetic visual pigment clues, a cross-disciplinary team led by a collaboration between the University of Bristol’s Davide Pisani, Professor of Phylogenomics in the School of Earth Sciences and Nicholas Roberts, Professor of Sensory Ecology in the School of Biological Sciences, were able to find that ancient predators with more complex eyes are likely to have seen in colour.

Professor Pisani remarked: “Being able to combine fossil and genetic data in this way is a really exciting frontier of modern palaeontological and biological research. Vision is key to many animals’ behaviour and ecology, and understanding how extinct animals perceived their environment will help enormously to clarify how they evolved.”

By calculating the time of emergence of different visual pigments, and then comparing them to the inferred age of origin of key fossil lineages, the researchers were able to work out the number of pigments likely to have been possessed by different fossil species. They found that fossil animals with more complex eyes appeared to have more visual pigments, and that the great predators of the Cambrian period may have been able to see in colour.

Dr James Fleming, Professor Pisani and Roberts’ former PhD student, explained: “Animal genomes and therefore opsin genes (constituting the base of different visual pigments) evolve by processes of gene duplication. The opsin and the pigment that existed before the duplication is like a parent, and the two new opsins (and pigments) that emerge from the duplication process are like children on a family tree.

“We calculated the birth dates of these children and this allowed understanding of what the ancient world must have seemed like to the animals that occupied it. We found that while some of the fossils we considered had only one pigment and were monochromat, i.e. they saw the world as if looking into a black and white TV, forms with more complex eyes, like iconic trilobites, had many pigments and most likely saw their world in colours.”

The combinations of complex eyes and multiple kinds of visual pigments are what allows animals to distinguish between different objects based on colour alone — what we know as colour vision.

Professor Roberts commented: “It is remarkable to see how in only a very few million years the view those animals’ had of their world changed from greys to the colourful world we see today.”

The project involved scientists from all across the world — from the UK as well as Denmark, Italy, Korea and Japan, where Dr Fleming has now moved to work as a postdoctoral researcher. Each of them brought their own specialities to this multidisciplinary work, providing expertise in genetics, vision, taxonomy and palaeontology.

Reference:
James F. Fleming, Reinhardt Møbjerg Kristensen, Martin Vinther Sørensen, Tae-Yoon S. Park, Kazuharu Arakawa, Mark Blaxter, Lorena Rebecchi, Roberto Guidetti, Tom A. Williams, Nicholas W. Roberts, Jakob Vinther, Davide Pisani. Molecular palaeontology illuminates the evolution of ecdysozoan vision. Proceedings of the Royal Society B: Biological Sciences, 2018; 285 (1892): 20182180 DOI: 10.1098/rspb.2018.2180

Note: The above post is reprinted from materials provided by University of Bristol.

Soft tissue shows Jurassic ichthyosaur was warm-blooded, had blubber and camouflage

December 6, 2018

Spectacular soft-tissue fossil (MH 432; Urweltmuseum Hauff, Holzmaden, Germany). Cells, cellular organelles and original biomolecules have been discovered in preserved soft parts of an approximately 180-million-year-old ichthyosaur (literally ‘fish-lizard’). Photographic (top) and diagrammatic (bottom) representation of the 85-cm-long fossil (which corresponds to roughly half of the original length of the animal). Credit: Johan Lindgren

An ancient, dolphin-like marine reptile resembles its distant relative in more than appearance, according to an international team of researchers that includes scientists from North Carolina State University and Sweden’s Lund University. Molecular and microstructural analysis of a Stenopterygius ichthyosaur from the Jurassic (180 million years ago) reveals that these animals were most likely warm-blooded, had insulating blubber and used their coloration as camouflage from predators.

“Ichthyosaurs are interesting because they have many traits in common with dolphins, but are not at all closely related to those sea-dwelling mammals,” says research co-author Mary Schweitzer, professor of biological sciences at NC State with a joint appointment at the North Carolina Museum of Natural Sciences and visiting professor at Lund University. “We aren’t exactly sure of their biology either. They have many features in common with living marine reptiles like sea turtles, but we know from the fossil record that they gave live birth, which is associated with warm-bloodedness. This study reveals some of those biological mysteries.”

Johan Lindgren, associate professor at Sweden’s Lund University and lead author of a paper describing the work, put together an international team to analyze an approximately 180 million-year-old Stenopterygius fossil from the Holzmaden quarry in Germany.

“Both the body outline and remnants of internal organs are clearly visible,” says Lindgren. “Remarkably, the fossil is so well-preserved that it is possible to observe individual cellular layers within its skin.”

Researchers identified cell-like microstructures that held pigment organelles within the fossil’s skin, as well as traces of an internal organ thought to be the liver. They also observed material chemically consistent with vertebrate blubber, which is only found in animals capable of maintaining body temperatures independent of ambient conditions.

Lindgren sent samples from the fossil to international colleagues, including Schweitzer. The team conducted a variety of high-resolution analytical techniques, including time-of-flight secondary ion mass spectrometry (ToF SIMS), nanoscale secondary ion mass spectrometry (NanoSIMS), pyrolysis-gas chromatography/mass spectrometry, as well as immunohistological analysis and various microscopic techniques.

Schweitzer and NC State research assistant Wenxia Zheng extracted soft tissues from the samples and performed multiple, high-resolution immunohistochemical analyses. “We developed a panel of antibodies that we applied to all of the samples, and saw differential binding, meaning the antibodies for a particular protein — like keratin or hemoglobin — only bound to particular areas,” Schweitzer says. “This demonstrates the specificity of these antibodies and is strong evidence that different proteins persist in different tissues. You wouldn’t expect to find keratin in the liver, for example, but you would expect hemoglobin. And that’s what we saw in the responses of these samples to different antibodies and other chemical tools.”

Lindgren’s lab also found chemical evidence for subcutaneous blubber. “This is the first direct, chemical evidence for warm-bloodedness in an ichthyosaur, because blubber is a feature of warm-blooded animals,” Schweitzer says.

Taken together, the researchers’ findings indicate that the Stenopterygius had skin similar to that of a whale, and coloration similar to many living marine animals — dark on top and lighter on the bottom — which would provide camouflage from predators, like pterosaurs from above, or pliosaurs from below.

“Both morphologically and chemically, we found that although Stenopterygius would be loosely considered ‘reptiles,’ they lost the scaly skin associated with these animals — just as the modern leatherback sea turtle has,” Schweitzer says. “Losing the scales reduces drag and increases maneuverability underwater.

“This animal’s preservation is unusual, especially for a marine environment — but then, the Holzmaden formation is known for its exceptional preservation. This specimen has given us more evidence that these tissues and molecules can preserve for extremely long periods, and that soft tissue analysis can shed light on evolutionary patterns, relationships, and how ancient animals functioned in their environment.

“Our results were repeatable and consistent across labs. This work really shows what we’re capable of discovering when we perform a multidisciplinary, multi-institutional study of an exceptional specimen.”

Reference:
Johan Lindgren, Peter Sjövall, Volker Thiel, Wenxia Zheng, Shosuke Ito, Kazumasa Wakamatsu, Rolf Hauff, Benjamin P. Kear, Anders Engdahl, Carl Alwmark, Mats E. Eriksson, Martin Jarenmark, Sven Sachs, Per E. Ahlberg, Federica Marone, Takeo Kuriyama, Ola Gustafsson, Per Malmberg, Aurélien Thomen, Irene Rodríguez-Meizoso, Per Uvdal, Makoto Ojika, Mary H. Schweitzer. Soft-tissue evidence for homeothermy and crypsis in a Jurassic ichthyosaur. Nature, 2018; DOI: 10.1038/s41586-018-0775-x

Note: The above post is reprinted from materials provided by North Carolina State University.

Volcanoes fed by ‘mush’ reservoirs rather than molten magma chambers

December 6, 2018

Volcanoes are not fed by molten magma formed in large chambers finds a new study, overturning classic ideas about volcanic eruptions.

Instead, the study suggests that volcanoes are fed by so-called ‘mush reservoirs’ — areas of mostly solid crystals with magma in the small spaces between the crystals.

Our understanding of volcanic processes, including those leading to the largest eruptions, has been based on magma being stored in liquid-filled ‘magma’ chambers — large, underground caves full of liquid magma. However, these have never been observed.

The new study, by researchers at Imperial College London and the University of Bristol and published today in Nature, suggests the fundamental assumption of a magma chamber needs a re-think.

Lead author Professor Matthew Jackson, from the Department of Earth Sciences and Engineering at Imperial, said: “We now need to look again at how and why eruptions occur from mush reservoirs. We can apply our findings to understanding volcanic eruptions with implications for public safety and also to understand the formation of metal ore deposits associated with volcanic systems.”

In order to erupt, volcanoes need a source of magma — melted, liquid rock — containing relatively few solid crystals. Traditionally, this magma was thought to be formed and stored in a large underground cave, called a magma chamber.

Recent studies of magma chemistry have challenged this view, leading to the suggestion of the mush reservoir model, where smaller pools of magma sit in the small gaps between solid crystals. However, the mush reservoir model could not explain how magmas containing relatively few crystals arise and are delivered to volcanoes in order for them to erupt at the surface.

Now, with sophisticated modelling of mush reservoirs, the research team has come up with a solution. Within the mush reservoir scenario, the magma is less dense than the crystals, causing it to rise up through the spaces between them.

As it rises, the magma reacts with the crystals, melting them and leading to local areas containing magma with relatively few crystals. It is these short-lived areas of increased magma that can lead to eruptions.

Co-author Professor Stephen Sparks, from the University of Bristol’s School of Earth Sciences, said: “A major mystery about volcanoes is that they were thought to be underlain by large chambers of molten rock. Such magma chambers, however, were very difficult to find.

“The new idea developed by geologists at Imperial and Bristol is that molten rock forms within largely crystalline hot rocks, spending most of its time in little pores within the rock rather than in large magma chambers. However, the rock melt is slowly squeezed out to form pools of melt, which can then erupt or form ephemeral magma chambers.”

As well as the initiation of eruptions, the new mush reservoir model can help explain other phenomena in volcanic systems, such as how the magma chemical composition evolves and how much older crystals can be erupted within younger magmas.

Reference:
M. D. Jackson, J. Blundy, R. S. J. Sparks. Chemical differentiation, cold storage and remobilization of magma in the Earth’s crust. Nature, 2018; DOI: 10.1038/s41586-018-0746-2

Note: The above post is reprinted from materials provided by Imperial College London. Original written by Hayley Dunning.

A microbe’s membrane helps it survive extreme environments

December 6, 2018

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Within harsh environments like hot springs, volcanic craters and deep-sea hydrothermal vents — uninhabitable by most life forms — microscopic organisms are thriving. How? It’s all in how they wrap themselves.

Stanford University researchers have identified a protein that helps these organisms form a protective, lipid-linked cellular membrane — a key to withstanding extremely highly acidic habitats.

Scientists had known that this group of microbes — called archaea — were surrounded by a membrane made of different chemical components than those of bacteria, plants or animals. They had long hypothesized that it could be what provides protection in extreme habitats. The team directly proved this idea by identifying the protein that creates the unusual membrane structure in the species Sulfolobus acidocaldarius.

The structures of some organisms’ membranes are retained in the fossil record and can serve as molecular fossils or biomarkers, leaving hints of what lived in the environment long ago. Finding preserved membrane lipids, for example, could suggest when an organism evolved and how that may have been the circumstance of its environment. Being able to show how this protective membrane is created could help researchers understand other molecular fossils in the future, offering new evidence about the evolution of life on Earth. The results appeared the week of Dec. 3 in Proceedings of the National Academy of Sciences.

“Our model is that this organism evolved the ability to make these membranes because it lives in an environment where the acidity changes,” said co-author Paula Welander, an assistant professor of Earth system science at Stanford’s School of Earth, Energy & Environmental Sciences (Stanford Earth). “This is the first time we’ve actually linked some part of a lipid to an environmental condition in archaea.”

Rare chemistry

The hot springs where S. acidocaldarius is found, such as those in Yellowstone National Park that are over 200 degrees Fahrenheit, can experience fluctuating acidity. This organism is also found in volcanic craters, deep-sea hydrothermal vents and other acidic environments with both moderate and cold temperatures.

Welander became interested in studying this microbe because of its rare chemistry, including its unusual lipid membranes. Unlike plants and fungi, archaeal organisms do not produce protective outer walls of cellulose and their membranes do not contain the same chemicals as bacteria. Scientists had explored how the species produced its unusual membrane for about 10 years before experimentation stopped in 2006, she said.

“I think we forget that some things just haven’t been done yet — I’ve been finding that a lot ever since I stepped into the geobiology world,” Welander said. “There are so many questions out there that we just need the basic knowledge of, such as, ‘What is the protein that’s doing this? Does this membrane structure really do what we’re saying it does?'”

From previous research in archaea, Welander and her team knew that the organisms produce a membrane containing a ringed molecule called a calditol. The group thought this molecule might underlie the species’ ability to withstand environments where other organisms perish.

To find out, they first went through the genome of S. acidocaldarius and identified three genes likely to be involved in making a calditol. They then mutated those genes one-by-one, eliminating any proteins the genes made. The experiments revealed one gene that, when mutated, produced S. acidocaldarius that lacked calditol in the membrane. That mutated organism was able to grow at high temperatures but withered in a highly acidic environment, suggesting that the protein is necessary to both make the unusual membrane and withstand acidity.

The work was particularly challenging because Welander’s lab had to replicate those high temperature, acidic conditions in which the microbes thrive. Most of the incubators in her lab could only reach body temperature, so lead author Zhirui Zeng, a postdoctoral researcher in Welander’s lab, figured out how to imitate the organism’s home using a special small oven, she said.

“That was really cool,” Welander said. “We did a lot of experimenting to try to figure out the chemistry.”

Third domain of life

This work is about more than just finding one protein, Welander said. Her research explores lipids found in present-day microbes with the goal of understanding Earth’s history, including ancient climatic events, mass extinctions and evolutionary transitions. But before scientists can interpret evolutionary characteristics, they need to understand the basics, like how novel lipids are created.

Archaea are sometimes called the “third domain of life,” with one domain being bacteria and the other being a group that includes plants and animals — collectively known as eukaryotes. Archaea includes some of the oldest, most abundant lifeforms on the planet, without which the ecosystem would collapse. Archaea are particularly anomalous microbes, confused with bacteria one day and likened to plants or animals the next because of their unique molecular structures.

The research is particularly interesting because the classification for archaea is still debated by taxonomists. They were only separated from the bacteria and eukaryote domains in the past two decades, following the development of genetic sequencing in the 1970s.

“There are certain things about archaea that are different, like the lipids,” Welander said. “Archaea are a big area of research now because they are this different domain that we want to study, and understand — and they’re really cool.”

Reference:
Zhirui Zeng, Xiao-Lei Liu, Jeremy H. Wei, Roger E. Summons, and Paula V. Welander. Calditol-linked membrane lipids are required for acid tolerance in Sulfolobus acidocaldarius. Proceedings of the National Academy of Sciences, 2018; DOI: 10.1073/pnas.1814048115

Note: The above post is reprinted from materials provided by Stanford’s School of Earth, Energy & Environmental Sciences. Original written by Danielle Torrent Tucker.

Tracing iron in the North Pacific

December 6, 2018

The iron cycle in the ocean. Credit: Yuntao Wang

The micronutrient iron (Fe) is recognized as a key factor in controlling oceanic primary productivity, and subsequently impacting the carbon cycle and marine ecosystem. The high-latitude area of the North Pacific is one of the three main high-nutrient and low-chlorophyll (HNLC) regions on Earth. Also, the growth of phytoplankton is limited by the availability of Fe. Climate change, human activities and ocean acidification are expected to influence the availability and transport of Fe in the ocean. Therefore, it is of great importance to study the Fe cycle and make reliable predictions for the future.

“As a result of human activity, the amount and composition of Fe induced by atmospheric decomposition has changed and affected the ocean. After depositing into the ocean, the distribution and transport of Fe is mainly determined by physical processes, e.g., mixing and upwelling. So, clarifying the sources and transport of biologically available Fe are key scientific questions for understanding the marine ecosystem,” explains Dr. Fei Chai, a researcher at the Second Institute of Oceanography and corresponding author of a project report recently published in Atmospheric and Oceanic Science Letters.

“The biological availability of Fe in the ocean also depends on the amount and strength of organic complex ligands. The spatial distribution of Fe-binding ligands is highly variable, with more ligands found in the Northwest Pacific than Northeast Pacific. Also, the strength of ligands is mainly affected by the pH of water, with lower pH reducing the strength of ligands and decreasing the Fe uptake rate of diatoms. Therefore, under the influence of ocean acidification, the distribution and strength of Fe-binding ligands will change considerably, with subsequent impacts on the ecosystem of the North Pacific,” adds Dr. Chai.

Dr. Fei Chai and his team, from the Second Institute of Oceanography, will develop and utilize a coupled physical-biological-Fe model, named ROMS-CoSiNE-Fe, in the North Pacific. The model will incorporate the Fe cycle for the upper North Pacific and make predictions of primary production and marine ecosystems in the future. The project is funded by the National Natural Science Foundation of China from 2018 to 2022.

“These studies will explore the sources and transport of biologically available Fe in the HNLC region. The results can give scientific advice to stakeholders on the feasibility of conducting ocean Fe fertilization,” says Dr. Chai, “In the future, we hope to better understand the rate of Fe uptake by phytoplankton and make predictions of changes in the marine ecosystem of the North Pacific.”

Reference:
Yuntao Wang et al, The sources and transport of iron in the North Pacific and its impact on marine ecosystems, Atmospheric and Oceanic Science Letters (2018). DOI: 10.1080/16742834.2019.1545513

Note: The above post is reprinted from materials provided by Chinese Academy of Sciences.

Medullary bone found in Cretaceous birds

December 6, 2018

Main slab of Pengornithid Enantiornithine, preserved in three-dimensions unlike most compression fossils from the Jehol Biota. Scale bar is one centimeter. Credit: Jingmai O’Connor

A team of scientists led by Jingmai O’Connor from the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP), Chinese Academy of Sciences, reported the first occurrence of medullary bone in Enantiornithes, the dominant clade of birds during the Cretaceous. The findings were published in Nature Communications on Dec. 5.

Medullary bone is a bone tissue unique to birds today. It is present only in females about to lay eggs and forms in the empty spaces within the skeleton. This bone tissue serves as a reservoir for calcium needed to form the eggshell.Medullary bone has been reported in a variety of non-avian dinosaurs including Tyrannosaurus rex, ornithopod dinosaurs like Tenontosaurus, and several sauropods (huge long-necked dinosaurs) including Mussasaurus. It has also been identified in pterosaurs, which are flying reptiles closely related to dinosaurs.

Since the first report of medullary bone in a Mesozoic fossil in 2005, this tissue has attracted great interest because it links birds and dinosaurs. However, the presence of this bone tissue in pterosaurs and non-avian dinosaurs is perplexing. Non-avian dinosaurs were so large and their eggs so small that they shouldn’t have required medullary bone. Since pterosaurs laid soft-shelled eggs, they also shouldn’t have required medullary bone.

Some reported instances of medullary bone are probably actually bone pathologies causing abnormal growth. However, in this report, IVPP scientists, working together with Mark Norell from the American Museum of Natural History and Greg Erickson from Florida State University, argued that no previous description of medullary bone in a Mesozoic reptile was well supported.

The new report is the best support for medullary bone in the Mesozoic so far since it was found throughout the entire preserved skeleton, suggesting it was part of a system-wide process rather than a local pathology. However, the authors concede that scientists still know too little about medullary bone to confirm, without additional evidence (e.g., association with a nest or eggs), that the fossilized individual with this tissue was reproductively active.

In light of the currently available evidence, medullary bone might have been an entirely avian feature even in the Mesozoic. It evolved as a result of the thinned, hollow bones in birds, which lightened the skeleton for flight, as well as their increased egg size.

Reference:
Jingmai O’Connor et al, Medullary bone in an Early Cretaceous enantiornithine bird and discussion regarding its identification in fossils, Nature Communications (2018). DOI: 10.1038/s41467-018-07621-z

Note: The above post is reprinted from materials provided by Chinese Academy of Sciences.

Millook Haven Beach, England

December 4, 2018

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Millook is a deep coastal valley and hamlet in the parish of Poundstock, on the north coast of Cornwall, England.

In 2014 the cliffs at Millook Haven were voted by the Geological Society of London as one of Britain’s top 10 geological sites, leading the “folding and faulting” category. The cliffs display an impressive series of recumbent chevron folds, in Carboniferous age killas of inter-bedded sandstones and shales, originally deposited in deep water.

The stony beach is popular with surfers despite there being few parking spaces and the South West Coast Path passes through the seaward end of the valley. The ancient semi-natural woodland has been described as the best ravine wood in Cornwall and along with the coast is within the Cornwall Area of Outstanding Natural Beauty.

Millook Haven

The coastal section through north Cornwall into Devon that runs to Bude and Hartland Point contains a spectacularly folded series of inter-bedded sandstones and shales originally deposited deeply under water.

The cliffs at Millock Haven are a great site for getting to grips with these deformed rocks.

The folds are recumbent and have a characteristic “chevron” kinky shape that tends to form when strongly layered rocks are buckled.

Photos

Millook Haven Beach, England

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Oxygen could have been available to life as early as 3.5 billion years ago

December 1, 2018

Microbes could have performed oxygen-producing photosynthesis at least one billion years earlier in the history of the Earth than previously thought.

The finding could change ideas of how and when complex life evolved on Earth, and how likely it is that it could evolve on other planets.

Oxygen in the Earth’s atmosphere is necessary for complex forms of life, which use it during aerobic respiration to make energy.

The levels of oxygen dramatically rose in the atmosphere around 2.4 billion years ago, but why it happened then has been debated. Some scientists think that 2.4 billion years ago is when organisms called cyanobacteria first evolved, which could perform oxygen-producing (oxygenic) photosynthesis.

Other scientist think that cyanobacteria evolved long before 2.4 billion years ago but something prevented oxygen from accumulating in the air.

Cyanobacteria perform a relatively sophisticated form of oxygenic photosynthesis — the same type of photosynthesis that all plants do today. It has therefore been suggested that simpler forms of oxygenic photosynthesis could have existed earlier, before cyanobacteria, leading to low levels of oxygen being available to life.

Now, a research team led by Imperial College London have found that oxygenic photosynthesis arose at least one billion years before cyanobacteria evolved. Their results, published in the journal Geobiology, show that oxygenic photosynthesis could have evolved very early in Earth’s 4.5-billion-year history.

Lead author Dr Tanai Cardona, from the Department of Life Sciences at Imperial, said: “We know cyanobacteria are very ancient, but we don’t know exactly how ancient. If cyanobacteria are, for example, 2.5 billion years old that would mean oxygenic photosynthesis could have started as early as 3.5 billion years ago. It suggests that it might not take billions of years for a process like oxygenic photosynthesis to start after the origin of life.”

If oxygenic photosynthesis evolved early, it could mean it is a relatively simple process to evolve. The probability of complex life emerging in a distant exoplanet may then be quite high.

It is difficult for scientists to figure out when the first oxygen-producers evolved using the rock record on Earth. The older the rocks, the rarer they are, and the harder it is to prove conclusively that any fossil microbes found in these ancient rocks used or produced any amount of oxygen.

Instead, the team investigated the evolution of two of the main proteins involved in oxygenic photosynthesis.

In the first stage of photosynthesis, cyanobacteria use light energy to split water into protons, electrons and oxygen with the help of a protein complex called Photosystem II.

Photosystem II is made up of two proteins called D1 and D2. Originally, the two proteins were the same, but although they have very similar structures, their underlying genetic sequences are now different.

This shows that D1 and D2 have been evolving separately — in cyanobacteria and plants they only share 30 percent of their genetic sequence. Even in their original form, D1 and D2 would have been able to perform oxygenic photosynthesis, so knowing how long ago they were identical could reveal when this ability first evolved.

To find out the difference in time between D1 and D2 being 100 percent identical, and them being only 30 percent the same in cyanobacteria and plants, the team determined how fast the proteins were changing — their rate of evolution.

Using powerful statistics methods and known events in the evolution of photosynthesis, they determined that the D1 and D2 proteins in Photosystem II evolved extremely slowly — even slower than some of the oldest proteins in biology that are believed to be found in the earliest forms of life.

From this, they calculated that the time between the identical D1 and D2 proteins and the 30 percent similar versions in cyanobacteria and plants is at least a billion years, and could be more than that.

Dr Cardona said: “Usually, the appearance of oxygenic photosynthesis and cyanobacteria are considered to be the same thing. So, to find out when oxygen was being produced for the first time researchers have tried to find when cyanobacteria first evolved.

“Our study instead shows that oxygenic photosynthesis likely got started long before the most recent ancestor of cyanobacteria arose. This is in agreement with current geological data that suggests that whiffs of oxygen or localized accumulations of oxygen were possible before three billion years ago.

“Therefore, the origin of oxygenic photosynthesis and the ancestor of cyanobacteria do not represent the same thing. There could be a very large gap in time between one and the other. It is a massive change in perspective.”

Now, the team are trying to recreate what the photosystem looked like before D1 and D2 evolved in the first place. Using the known variation in photosystem genetic codes across all species alive today, they are trying to piece together the ancestral photosystem genetic code.

Reference:
Tanai Cardona, Patricia Sánchez-Baracaldo, A. William Rutherford, Anthony W. Larkum. Early Archean origin of Photosystem II. Geobiology, 2018; DOI: 10.1111/gbi.12322

Note: The above post is reprinted from materials provided by Imperial College London. Original written by Hayley Dunning.

Whales lost their teeth before evolving hair-like baleen in their mouths

December 1, 2018

This is an artistic reconstruction of a mother and calf of Maiabalaena nesbittae nursing offshore of Oregon during the Oligocene, about 33 million years ago. While Maiabalaena would not have been able to chew or filter feed, muscle attachments on the bones of its throat indicate it likely had strong cheeks and a retractable tongue. These traits would have enabled it to suck water into its mouth, taking up fish and small squid in the process. The ability to suction feed would have rendered teeth, whose development requires a lot of energy to grow, unnecessary. The loss of teeth, then, appears to have set the evolutionary stage for the baleen, which the scientists estimate arose about 5 to 7 million years later.
Credit: Alex Boersma

Rivaling the evolution of feathers in dinosaurs, one of the most extraordinary transformations in the history of life was the evolution of baleen — rows of flexible hair-like plates that blue whales, humpbacks and other marine mammals use to filter relatively tiny prey from gulps of ocean water. The unusual structure enables the world’s largest creatures to consume several tons of food each day, without ever chewing or biting. Now, Smithsonian scientists have discovered an important intermediary link in the evolution of this innovative feeding strategy: an ancient whale that had neither teeth nor baleen.

In the Nov. 29 issue of the journal Current Biology, scientists at the Smithsonian’s National Museum of Natural History and colleagues describe for the first time Maiabalaena nesbittae, a whale that lived about 33 million years ago. Using new methods to analyze long-ago discovered fossils housed in the Smithsonian’s national collection, the team, which includes scientists at George Mason University, Texas A&M University and the Burke Museum of Natural History and Culture in Seattle, have determined that this toothless, 15-foot whale likely had no baleen, showing a surprising intermediary step between the baleen whales that live today and their toothed ancestors.

“When we talk about whale evolution, textbooks tend to focus on the early stages, when whales went from land to sea,” said National Museum of Natural History’s curator of fossil marine mammals. “Maiabalaena shows that the second phase of whale evolution is just as important for evolution over big scales. For the first time, we can now pin down the origin of filter-feeding, which is one of the major innovations in whale history.”

When whales first evolved, they used teeth to chew their food, just like their land-dwelling ancestors. As time went on, many descendants of these early whales continued to chew their food, inheriting this trait from their predecessors. But as the oceans around them changed and animals evolved, entirely new feeding strategies arose, including baleen filter feeding, says National Museum of Natural History predoctoral fellow Carlos Mauricio Peredo, the lead author of the study who analyzed the Maiabalaena fossils.

Whales were the first mammals to evolve baleen, and no other mammal uses any anatomical structure even remotely similar to it to consume its prey. But frustratingly, baleen, whose chemical composition is more like that of hair or fingernails than bone, does not preserve well. It is rarely found in the fossil record, leaving paleontologists without direct evidence of its past or origins. Instead, scientists have had to rely on inferences from fossils and studies of fetal-whale development in the womb to piece together clues about how baleen evolved.

As a result, it has not been clear whether, as they evolved, early baleen whales retained the teeth of their ancestors until a filter-feeding system had been established. An early initial assumption, Peredo said, was that ocean-dwelling mammals must have needed teeth or baleen to eat — but several living whales contradict that idea. Sperm whales have teeth in their bottom jaw, but none on the top, so they cannot bite or chew. Narwhals’ only teeth are their long tusks, which they do not use for feeding. And some species of beaked whales, despite being classified as toothed whales, have no teeth at all.

Because of its age, Peredo said, paleontologists suspected Maiabalaena might hold important clues about baleen’s evolution. The fossil comes from a period of massive geological change during the second major phase of whale evolution, around the time the Eocene epoch was transitioning to the Oligocene. With continents shifting and separating, ocean currents were swirling around Antarctica for the first time, cooling the waters significantly. The fossil record indicates that whales’ feeding styles diverged rapidly during this timeframe, with one group leading to today’s filter-feeding whales and the other leading to echolocating ones.

Consequently, Maiabalaena had received plenty of scrutiny since its discovery in Oregon in the 1970s, but the rock matrix and material that the fossil was collected in still obscured many of its features. It was not until Peredo finally cleaned the fossil and then examined it with state-of-the-art CT scanning technology that its most striking features became clear. Maiabalaena’s lack of teeth was readily apparent from the preserved bone, but the CT scans, which revealed the fossil’s internal anatomy, told the scientists something new: Maiabalaena’s upper jaw was thin and narrow, making it an inadequate surface from which to suspend baleen.

“A living baleen whale has a big, broad roof in its mouth, and it’s also thickened to create attachment sites for the baleen,” Peredo said. “Maiabalaena does not. We can pretty conclusively tell you this fossil species didn’t have teeth, and it is more likely than not that it didn’t have baleen either.”

While Maiabalaena would not have been able to chew or to filter feed, muscle attachments on the bones of its throat indicate it likely had strong cheeks and a retractable tongue. These traits would have enabled it to suck water into its mouth, taking up fish and small squid in the process. The ability to suction feed would have rendered teeth, whose development requires a lot of energy to grow, unnecessary. The loss of teeth, then, appears to have set the evolutionary stage for the baleen, which the scientists estimate arose about 5 to 7 million years later.

Peredo and Pyenson see studying whale evolution as key to understanding their survival in today’s rapidly changing oceans. Like the emergence of baleen, tooth loss in whales is evidence of adaptability, suggesting that whales might be able to adapt to challenges posed in the ocean today. Still, Peredo cautions, evolutionary change may be slow for the largest whales, which have long life spans and take a long time to reproduce.

“Given the scale and rate of changes in the ocean today, we don’t exactly know what that will mean for all of the different species of filter-feeding whales,” he said. “We know that they’ve changed in the past. It’s just a matter of whether they can keep up with whatever the oceans are doing — and we’re changing the oceans pretty quickly right now.”

Reference:
Carlos Mauricio Peredo, Nicholas D. Pyenson, Christopher D. Marshall, Mark D. Uhen. Tooth Loss Precedes the Origin of Baleen in Whales. Current Biology, 2018; DOI: 10.1016/j.cub.2018.10.047

Note: The above post is reprinted from materials provided by Smithsonian.

Oldest-known ancestor of modern primates may have come from North America, not Asia

December 1, 2018

Teilhardina brandti, a 56-million year-old primate found in Wyoming, may be older than its Asian cousin, previously thought to be the earliest ancestor of modern primates. Unusual tooth sockets in this lower jaw of Teilhardina brandti helped make the determination. Credit: Florida Museum image by Paul Morse

About 56 million years ago, on an Earth so warm that palm trees graced the Arctic Circle, a mouse-sized primate known as Teilhardina first curled its fingers around a branch.

The earliest-known ancestor of modern primates, Teilhardina’s close relatives would eventually give rise to today’s monkeys, apes and humans. But one of the persistent mysteries about this distant cousin of ours is where it originated.

Teilhardina (ty-hahr-DEE’-nuh) species quickly spread across the forests of Asia, Europe and North America, a range unparalleled by all other primates except humans. But where did its journey begin?

New research shows that Teilhardina brandti, a species found in Wyoming, is as old or older than its Asian and European relatives, upending the prevailing hypothesis that Teilhardina first appeared in China.

Teilhardina’s origins, however, remain a riddle.

“The scientific conclusion is ‘We just don’t know,'” said Paul Morse, the study’s lead author and a recent University of Florida doctoral graduate. “While the fossils we’ve found potentially overturn past hypotheses of where Teilhardina came from and where it migrated, they definitely don’t offer a clearer scenario.”

What is clear, Morse said, is that T. brandti had a wide variety of features, some of which are as primitive as those found in Teilhardina asiatica, its Asian cousin, previously thought to be the oldest species in the genus.

To make this determination, Morse studied 163 teeth and jaws in the most comprehensive analysis of T. brandti to date.

Teeth contain a treasure-trove of information and often preserve better than bone, thanks to their tough enamel. They can reveal clues about an animal’s evolutionary past, its size, diet and age as an individual and in geological time.

Primate teeth have particularly distinct structures that are immediately recognizable to the trained eye, said Jonathan Bloch, study co-author and curator of vertebrate paleontology at the Florida Museum of Natural History.

“Identifying differences between primate teeth is not so different from a biker recognizing that a Harley is different from a scooter or an art critic evaluating whether an image was created by Picasso or Banksy,” he said. “In detail, they are very different from each other in specific, predictable ways.”

While Teilhardina bones are very rare in the fossil record, its teeth are more plentiful — if you know how to find them. Bloch’s team of paleontologists, Morse included, have spent years combing the surface of Wyoming’s Bighorn Basin on hands and knees and then packing out 50-pound bags of soil to a river to screen wash. The remaining bits of bones and teeth — which can be smaller than a flea — are examined under a microscope back at the museum.

This painstaking search has built up the dental record of T. brandti from a single molar — used to first describe the species in 1993 — to hundreds of teeth, providing a broad look at the primate’s population-level variation.

Still, Morse and Bloch were unprepared for the peculiar variation exhibited by specimen UF 333700, a jagged piece of jaw with T. brandti teeth.

“Jon and I started arguing about the alveoli” — empty tooth sockets — “and how they didn’t look right at all,” said Morse, now a postdoctoral researcher at Duke University. “By the end of the day, we realized that specimen completely overturned both the species definition of T. asiatica and part of the rationale for why it is the oldest Teilhardina species.”

Studies based on a small number of teeth simply missed the diversity in Teilhardina’s physical characteristics, Morse said.

“There’s likely a tremendous amount of variation in the fossil record, but it’s extremely difficult to capture and measure when you have a small sample size,” he said. “That’s one of the reasons collecting additional fossils is so important.”

The analysis also reshuffled the Teilhardina family tree, reducing the number of described species from nine to six and reclassifying two species as members of a new genus, Bownonomys, named for prominent vertebrate paleontologist Thomas Bown.

But the precise ages of Teilhardina species are still impossible to pinpoint and may remain that way.

Teilhardina appeared during the geological equivalent of a flash in the pan, a brief 200,000-year period known as the Paleocene-Eocene Thermal Maximum, or PETM. This era was characterized by a massive injection of carbon into the Earth’s atmosphere, which sent global temperatures soaring. Sea levels surged by 220 feet, ecosystems were overhauled and the waters at the North Pole warmed to 74 degrees.

Scientists can use the distinct carbon signature of the PETM to locate this period in the rock record, and carbon isotopes in teeth can also be used to identify fossil animals from the era.

But among Teilhardina fossil sites across the globe, only Wyoming has the uninterrupted, neatly demarcated layers of rock that allow paleontologists to hone in on more precise dates.

“The humblest statement would be to say that these species are essentially equivalent in age,” Bloch said. “Determining which came earlier in the PETM probably surpasses the level of resolution we have in the rock record. But what we can say is that the only place where you can really establish where Teilhardina appears in this climate event with confidence is in the Bighorn Basin.”

As the Earth warmed, plants and animals expanded their ranges northward, returning south as temperatures cooled at the end of the PETM.

“This dance of plants and animals with climate change happened over vast landscapes, with forests moving from the Gulf Coast to the Rocky Mountains in just a few thousand years,” Bloch said.

Teilhardina likely tracked the shifts in its forest habitats across the land bridges that then connected North America, Greenland and Eurasia, he said.

“Teilhardina is not throwing its bag over its shoulder and walking,” he said. “Its range is shifting from one generation to the next. Over 1,000 years, you get a lot of movement, and over 2,000-3,000 years, you could easily cover continental distances.”

While it was well-suited to Earth’s hothouse environment, Teilhardina disappeared with the PETM, replaced by new and physically distinct primates. It’s a sobering reminder of what can happen to species — including humans — during periods of swift climatic changes, Bloch said.

“A changing planet has dramatic effects on biology, ecosystems and evolution. It’s part of the process that has produced the diversity of life we see today and mass extinctions of life that have happened periodically in Earth’s history,” Bloch said. “One of the unexpected results of global warming 56 million years ago is that it marks the origin of the group that ultimately led to us. How we will fare under future warming scenarios is less certain.”

Reference:
Paul E. Morse, Stephen G.B. Chester, Doug M. Boyer, Thierry Smith, Richard Smith, Paul Gigase, Jonathan I. Bloch. New fossils, systematics, and biogeography of the oldest known crown primate Teilhardina from the earliest Eocene of Asia, Europe, and North America. Journal of Human Evolution, 2018; DOI: 10.1016/j.jhevol.2018.08.005

Note: The above post is reprinted from materials provided by Florida Museum of Natural History.

New automated volcano warning system forecasts imminent eruptions

December 1, 2018

Mount Etna Eruption on Jan. 12, 2011. Credit: gnuckx

Scientists have developed an automated early warning system for volcanic eruptions, according to a new study. The new system helped government officials warn the public of impending eruptions in Italy and could potentially do the same around the globe, according to the study’s authors.

New research in the Journal of Geophysical Research: Solid Earth, a journal of the American Geophysical Union, details the new system that monitors volcanic noises and automatically alerts officials if an eruption is imminent. The study’s authors tested this system over a period of eight years on Mount Etna, a volcano on the island of Sicily. Using the new system, the Italian government activated an emergency plan about one hour prior to an eruption for the first time in late 2015.

A majority of the approximately 1,500 active volcanoes around the world are not monitored in real time. Many volcanoes are monitored with methods based on seismic waves, which are vibrations of the Earth’s layers that can be triggered by eruptions. But seismic waves are often not great at telling volcanic explosions apart from other processes, like internal magma movements, earthquakes, or storms, the study’s authors said. Most of the methods require input from volcano experts and alerts are sent only after volcanoes begin erupting.

Aircraft pilots, for example, should know about volcanic eruptions as early as possible, said Maurizio Ripepe, a geophysicist at the University of Florence in Florence, Italy, and lead author of the new study. On several occasions in the past, aircraft encounters with volcanic ash clouds have led to engine failure.

“Tens of seconds sometimes can save lives and reduce damage, like in the case of an earthquake” Ripepe said. “The need is to have something automatic that can be used to speed up the procedure to reduce risk.”

Volcanic noises can enable early warnings to be issued quickly and dependably, according to Ripepe. Volcanoes generate low-frequency sounds inaudible to human ears during their eruption processes, and these infrasonic waves can travel over thousands of kilometers and are more closely related to volcanic eruptions than seismic waves, he said.

In the new study, researchers listened to sounds produced by Mount Etna for years with arrays of infrasonic sensors placed 6 kilometers (3.7 miles) from the volcano.

They found the infrasound sensors can reliably identify eruption signals. From 2008 to 2016, the sensors detected 57 of 59 eruptions and sent alerts to the researchers about an hour before each eruption.

“When we got this percentage of success, [the Department of Italian Civil Protection] decided to use it as an operational system,” Ripepe said. “Now we send SMS messages and emails to the authorities that are in charge to start an emergency plan in case of volcanic eruption.”

On Dec. 4, 2015, a warning was automatically issued to the Italian government almost two hours before an eruption, which allowed the government to activate emergency plans about one hour in advance of a volcanic eruption for the first time, Ripepe said. For the last four years, the automated system has remained operational in monitoring Etna and has issued warnings without error.

To extend the benefits of automated warnings to the rest of the world, researchers must study infrasound from other types of volcanoes. Early eruption phases in Etna, which allow for early warnings, may be shorter or completely absent in volcanoes with different dynamics, according to the authors.

Another hurdle for global monitoring is the area of coverage required to monitor all active volcanoes around the globe, but infrasound could offer a solution, Ripepe said.

The idea for a global warning system would be to use infrasonic arrays to monitor several volcanoes at once over long distances, Ripepe said. As a first step, the researchers studied an array set up hundreds of kilometers away from Etna. They found these measurements to be favorable and are now studying arrays up to 1,000 kilometers (621.3 miles) away from the volcano.

“This opens a new way to do monitoring of volcanoes at the global scale,” Ripepe said.

Reference:
M. Ripepe et al. Infrasonic Early Warning System for Explosive Eruptions, Journal of Geophysical Research: Solid Earth (2018). DOI: 10.1029/2018JB015561

Note: The above post is reprinted from materials provided by American Geophysical Union.
This story is republished courtesy of AGU Blogs (http://blogs.agu.org), a community of Earth and space science blogs, hosted by the American Geophysical Union.

Fossil algae reveal 500 million years of climate change

December 1, 2018

For her research Witkowski collected seawater with fresh, modern algae to test potential indicators of the past. Credit: Caitlyn Witkowski

Table of Contents

Earth scientists are able to travel far back in time to reconstruct the geological past and paleoclimate to make better predictions about future climate conditions. Scientists at the Netherlands Institute for Sea Research (NIOZ) and Utrecht University succeeded in developing a new indicator (proxy) of ancient CO2-levels, using the organic molecule phytane, a debris product of chlorophyll. This new organic proxy not only provides the most continuous record of CO2-concentrations ever, it also breaks a record in its time span, covering half a billion years. The data show the present idea that rises in CO2-levels that used to take millions of years, are now happening in a century. These findings are published in Science Advances on November 28th.

As CO2 increases today, it’s vital to understand what impact these changes will have. To better predict the future, we must understand long-term changes in CO2 over geologic history. Direct measurements of past CO2 are available, e.g. bubbles in ice cores containing ancient gases. However, ice cores have a limited time span of one million years. To go farther back in time, earth scientists have developed various indirect measurements of CO2 from proxies e.g. from algae, leaves, ancient soils and chemicals stored in ancient sediments to reconstruct past environmental conditions.

Phytane, a new way to travel in time

A new proxy, using a degradation product of chlorophyll, allows geochemists to infer a continuous record of historic CO2-levels in deep time. Scientists at NIOZ have recently developed phytane as a promising new organic proxy that uncovers half a billion years of CO2-levels in the oceans, from the Cambrian until recent times.

Using the new proxy, they were able to make the most continuous record of ancient carbon dioxide levels ever. “We developed and validated a new way to time travel — going farther back in time and to more places,” says NIOZ-scientist Caitlyn Witkowski. “With phytane, we now have the longest CO2-record with one single marine proxy. This new data is invaluable to modelers who can now more accurately make predictions of the future.”

Witkowski and colleagues selected more than 300 samples of marine sediments from deep sea cores and oils from all over the globe, reflecting the majority of geological periods in the last 500 million years.

Fossil molecules

Past chemical reactions can be ‘stored’ in fossil molecules, and so they may reflect various ancient environmental conditions. Geochemists are able to ‘read’ these conditions, such as seawater temperature, pH, salinity and CO2-levels. Organic matter, such as phytane, reflects the pressure of CO2 in ocean water or the atmosphere (pCO2).

Little green miracles

Although all organic matter has the potential to reflect CO2, phytane is special. Phytane is the pigment responsible for our green world. Anything that uses photosynthesis to absorb sunlight, including plants, algae, and some species of bacteria, has chlorophyll from which phytane comes. Plants and algae take in CO2 and produce oxygen. Without these little green miracles, our world just wouldn’t be the same.

Because chlorophyll is found all around the world, phytane is also everywhere and is a major constituent of decayed and fossilized biomass. “Phytane doesn’t chemically change over the course of time, even if it is millions of years old,” Witkowski says.

Carbon isotope fractionation

CO2 of the past is estimated from organic matter, such as phytane, through the phenomenon of carbon isotope fractionation during photosynthesis. When taking up CO2, plants and algae prefer the light carbon isotope (12C) over the heavy carbon isotope (13C). They only use the heavy carbon isotope when CO2-levels in the surrounding water or atmosphere are low. The proportion between these two isotopes therefore reflects the level of carbon dioxide in the environment at the moment of growth.

This also explains why Witkowski didn’t use terrestrial plants as a source for her research, exclusively using phytane from (fossilized) marine sources. The plant world is divided into so-called C3- and C4-plants, each with their own unique ratio of light-to-heavy carbon. Phytoplankton all have very similar ratios compared to their plant counterparts. Witkowski: “By choosing only marine sources, we could limit uncertainty of the phytane source in the dataset.”

“In our data, we see high levels of carbon dioxide, reaching 1000 ppm as opposed to today’s 410 ppm. In this respect, present day levels are not unique, but the speed of these changes have never been seen before. Changes that typically take millions of years are now happening in a century. This additional CO2-data may help us understand the future of our planet.” In future research, phytane can be used to go even further back in time than the Phanerozoic, the earliest found in two billion-year-old samples.

Reference:
Caitlyn R. Witkowski, Johan W. H. Weijers, Brian Blais, Stefan Schouten, and Jaap S. Sinninghe Damst&#2013265929;. Molecular fossils from phytoplankton reveal secular Pco2 trend over the Phanerozoic. Science Advances, 2018 DOI: 10.1126/sciadv.aat4556

Note: The above post is reprinted from materials provided by Royal Netherlands Institute for Sea Research.

Blood-sucking flies have been spreading malaria for 100 million years

December 1, 2018

Mosquitoes in the amber. Credit: © Kriss Szkurlatowski / Fotolia

The microorganisms that cause malaria, leishmaniasis and a variety of other illnesses today can be traced back at least to the time of dinosaurs, a study of amber-preserved blood-sucking insects and ticks show.

In addition to demonstrating the antiquity of vectors and their long-term association with parasitic microorganisms, the findings are remarkable for several reasons.

First, bloodsuckers like mosquitoes, fleas, sand flies, ticks and biting midges aren’t frequently found in amber, and rarer yet is evidence of any microorganisms they might have been carrying.

But a review by entomologist George Poinar of Oregon State University showed that amber from five regions around the world contained hematophagous arthropods carrying preserved, identifiable pathogens and parasites.

“Feeding on vertebrate blood evolved as an efficient way for certain insects and acarines to get protein for growth and reproduction,” said Poinar, professor emeritus in the College of Science and an international expert on plant and animal life forms found preserved in amber. “It’s likely that primitive mosquitoes and other arthropod vectors were present back in the Jurassic and were even transmitting pathogens at that period. This would have resulted in widely dispersed diseases, many of which were probably fatal to vertebrates when they first appeared.”

Poinar looked at bloodsucking insects and ticks encased in Dominican, Mexican, Baltic, Canadian and Burmese amber dating back from 15 million to 100 million years.

Among the vectors were mosquitoes, sand flies, biting midges, bat flies, black flies, fleas, kissing bugs and ticks. They carry a cornucopia of microorganisms that today cause diseases such as filariasis, sleeping sickness, river blindness, typhus, Lyme disease and, perhaps most significantly, malaria.

Malaria remains a relentless public health concern, with multiple nations reporting increases in infections for 2018. In Venezuela alone, Poinar notes, more than 650,000 new cases of malaria have been reported this year.

“Numerous malaria species parasitize vertebrates today, and we now know that over the past 100 million years, malaria was being vectored by mosquitoes, biting midges, bat flies and ticks,” Poinar said. “Obtaining fossil records of pathogens carried by biting arthropods establishes a timeline when and where various diseases appeared and how they could have affected the survival, extinction and distribution of vertebrates over time.”

Poinar stresses, however, that while his research shows what parasites and pathogens specific bloodsuckers were transmitting at particular periods and locations in the past, “these fossils are not old enough to tell us when and how associations between vectors, pathogens and vertebrates originated.”

Poinar believes that the microorganisms first infected blood-sucking arthropods and only after equilibria had been reached between them were the microorganisms then vectored to vertebrates.

“That topic has been and will continue to be under discussion for years to come,” he said.

Reference:
George Poinar. Vertebrate pathogens vectored by ancient hematophagous arthropods. Historical Biology, 2018; 1 DOI: 10.1080/08912963.2018.1545018

Note: The above post is reprinted from materials provided by Oregon State University. Original written by Steve Lundeberg.

A large volcanic eruption shook Deception Island 3,980 years ago

November 27, 2018

A large volcanic eruption shook Deception Island, in Antarctica, 3,980 years ago, and not 8,300, as it was previously thought, according to an international study published in Scientific Reports, in which researchers from the Institute of Earth Sciences Jaume Almera have participated. This event was the largest eruption in the austral continent during the Holocene (the last 11,700 years after the last great glaciation on Earth), and was comparable in volume of ejected rock to the Tambora volcano eruption in 1815. The eruption formed the caldera of the volcano, one of the most active in Antarctica, with more than 20 eruptions registered in the last 200 years.

In the study, whose first author was Dermot Antoniades, from the University of Laval, Canada have taken part researchers from the Universities of Barcelona (UB), Salamanca (USAL), and Cambridge and Leicester (UK), CREAF, the Centre for Research, and Monitoring and Evaluation of the Sierra de Guadarrama National Park, and Centre for Hydrographic Studies (CEDEX).

According to the age published in this new study, a volcanic eruption caldera collapse type took place 3980 years ago. The emptying of the magmatic chamber, the zone of magma accumulation that fuelled the eruption, during this violent eruptive event caused a sudden pressure drop which in turn caused the collapse of the upper part of the volcano. As a result, a depression between 8 and 10 kilometres in diameter was formed, which is what today gives to Deception Island its particular horseshoe shape. The caldera collapse would have caused a seismic event of great magnitude whose trace was recorded in the sediments accumulated in the lakes’ bottom of Livingstone Island.

The lacustrine sediment cores were recovered during the Antarctic campaigns of the HOLOANTAR project, between 2012 and 2014. This fieldwork was lead and coordinated by Marc Oliva, then researcher at Instituto de Geografia e Ordenamento of the University of Lisboa and now Ramon y Cajal researcher at University of Barcelona (UB). Oliva is coauthor of this study.

“The initial objective of the study was purely climatic, since we wanted to reconstruct the climate fluctuations of this region for the last 11,700 years using different proxies found in the sediments of the Byers Peninsula lakes, about 40 kilometres north of Deception Island. However, the presence of a different sediment layer in all lakes and of the same age after a thick layer of tephra surprised us,” said Sergi Pla, researcher at CREAF and coauthor of the study.

“Later geochemical and biological analyses indicated us that these sediments had terrestrial origin and were deposited abruptly in the lake’s bottom. These results suggested the occurrence of a major earthquake that affected all this area; put us on the track that, perhaps, we were not facing a common earthquake but the one generated by the collapse of the caldera of the Deception Island volcano. From here on, we pulled the thread,” explained Santiago Giralt, researcher at ICTJA-CSIC and co-author of the study.

The exact date of the eruption was obtained using different geochemical, petrological and paleolimnological techniques applied on the sediment cores from 4 lakes of the Byers Peninsula from Livingston island.

These sedimentary records contained several direct and indirect pieces of evidence of the volcanic event that occurred in Deception Island. “The recovered sedimentary records showed a common pattern: first the volcanic ash from Deception Island eruption, overlaid by a sediment layer almost one meter thick composed by material dragged from the lakes’ shores to their bottom due to the large earthquake and, finally, the common lake sediments, which are characterized by an alternation of clays and mosses,” explained Santiago Giralt.

One of the challenges that faced this study was to characterize the origin of the ashes produced during the volcanic eruption. For that, pressure and temperature conditions of the magmas that originated this eruption were calculated using the ashes present in the sediment cores. “Using this methodology, we were able to estimate the depth of all studied samples and to determine if they were part of the same magma and eruptive episode,” said Antonio Álvarez Valero, researcher from the University of Salamanca (USAL) and co-author of this study.

The study also estimates that the eruption had a Volcanic Explosive Index (VEI) around 6 which possibly makes it the largest known Holocene eruptive episode in the Antarctic continent.

“This colossal episode of eruptive caldera collapse ejected between 30 and 60 cubic kilometres of ash, comparable in volume to the eruption of the Tambora volcano in 1815, an event that is attributed to a global temperature cooling that resulted in a series of bad harvests in Europe, in what is known as the “year without summer,” explains Adelina Geyer, ICTJA-CSIC researcher and co-author of the study.

“It is very important to be able to date this type of eruptions that allow us to understand the climatic changes caused by volcanic eruptions, in this particular case at high austral latitudes,” adds the Geyer.

As suggested by this study, this eruption could have had significant climatic and ecological impacts in a large area of the southern region, although more studies and new data are needed to precisely characterize what the real effects on the climate of this large eruptive event.

Reference:
Dermot Antoniades, Santiago Giralt, Adelina Geyer, Antonio M. Álvarez-Valero, Sergi Pla-Rabes, Ignacio Granados, Emma J. Liu, Manuel Toro, John L. Smellie, Marc Oliva. The timing and widespread effects of the largest Holocene volcanic eruption in Antarctica. Scientific Reports, 2018; 8 (1) DOI: 10.1038/s41598-018-35460-x

Note: The above post is reprinted from materials provided by Spanish National Research Council (CSIC).

Humans may be reversing the climate clock, by 50 million years

Alaska earthquakes offer new insight into improving hazard assessment

The complex history of Earth’s magnetic reversals

Scientists find new giant dinosaur

Scientists discover possible mantle mineral

Biggest mass extinction caused by global warming leaving ocean animals gasping for breath

Enhancing our vision of the past

Soft tissue shows Jurassic ichthyosaur was warm-blooded, had blubber and camouflage

Volcanoes fed by ‘mush’ reservoirs rather than molten magma chambers

A microbe’s membrane helps it survive extreme environments

Rare chemistry

Third domain of life

Tracing iron in the North Pacific

Medullary bone found in Cretaceous birds

Millook Haven Beach, England

Millook Haven

Photos

Oxygen could have been available to life as early as 3.5 billion years ago

Whales lost their teeth before evolving hair-like baleen in their mouths

Oldest-known ancestor of modern primates may have come from North America, not Asia

New automated volcano warning system forecasts imminent eruptions

Fossil algae reveal 500 million years of climate change

Phytane, a new way to travel in time

Fossil molecules

Little green miracles

Carbon isotope fractionation

Blood-sucking flies have been spreading malaria for 100 million years

A large volcanic eruption shook Deception Island 3,980 years ago

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