Researchers identify genetic mutation contributing to reproductive isolation between carrion and hooded crows due to differences in plumage color. The mutation appears to have been favored by natural selection, potentially providing a selective advantage in hot regions.
Scientists analyzed mineral data from glaciers to determine Earth's climate before the Neoproterozoic glaciation. They found that the planet may have experienced a gradual cool-off into a Snowball Earth state, rather than an abrupt transition.
Ancient sediment analysis reveals mangrove ecosystems can survive up to a 7mm per year sea-level rise threshold. Mangroves provide essential ecosystem services but are threatened by rapid sea-level rise, with current rates expected to surpass the survival limit within 30 years.
A study by the University of the Basque Country reveals 12 former coastlines under the sea off the Basque coast, formed due to major climate changes and fluctuations in sea levels. The researchers used advanced technology to create 3D maps of the seabed, showing irregularly distributed rocky platforms that had not been predefined.
Researchers determined that the Great Oxidation Event occurred within a time interval spanning the Paleoproterozoic Era's two sedimentary formations. The study suggests the GOE predated global glaciation, contrary to previous assumptions.
A study published in BMC Biology suggests that northern and southern Italian populations diverged genetically as early as 19,000-12,000 years ago. The research found distinct genetic variants between individuals from different regions, with adaptations to climate-specific genes.
New Rutgers research confirms that modern sea-level rise is linked to human activities and not changes in Earth's orbit. Surprisingly, the Earth had nearly ice-free conditions with carbon dioxide levels similar to today.
Researchers propose that catastrophic outburst floods, triggered by warm periods, carved Greenland's megacanyon over time. The floods are believed to have occurred hundreds of times, carving the Grand Canyon and influencing ocean circulation and present-day ice-sheet stability.
A team of scientists proposes that catastrophic outburst floods carved Greenland's megacanyon network, influenced by large meltwater-filled lakes. The study suggests that these floods could have impacted ocean circulation and caused abrupt climate changes with regional significance.
The discovery of ancient frog fossils in Antarctica provides insight into a warm and temperate climate before the continent's separation. The 40-million-year-old fossils found on Seymour Island suggest that the Antarctic Peninsula may have had forests similar to those in modern-day South America.
A new record of deglaciations reveals the persistent influence of obliquity and insolation in pacing Earth's glacial-interglacial cycle. The study presents a high-resolution record of the last 11 deglaciations, showing that Earth's obliquity remained the main driver of glacial cycles throughout the Quaternary period.
Researchers found that Antarctic Bottom Water, a deep-water mass in the Southern Hemisphere, was disrupted from spreading northwards into the South Atlantic and Indian Oceans during peak ice ages. The study suggests that weaker circulation in the Southern Ocean during cold periods may have interrupted this process.
A team of researchers from Binghamton University and Emerson College analyzed data from 14,000 years ago and found that Native Americans did not make large-scale changes to the environment. The study suggests that ancient native people thrived under changing forest conditions by adapting to them, rather than intensively managing the land.
A study of 2.7 billion-year-old micrometeorites reveals that the early atmosphere likely contained between 25-50% CO2, leading to a cooler climate with evidence of glaciation. This finding suggests lower nitrogen levels in the ancient atmosphere, allowing for a modest greenhouse effect.
Animal species from low-disturbance environments are more sensitive to modern forest fragmentation, according to a study of global datasets. The researchers found strong support for the extinction filter hypothesis, suggesting that species adapted to high disturbance areas may be more resilient to new disturbances.
A major impact event around 466 Mya may have triggered cooling and biological diversification, leading to late Ordovician glaciation. Cosmic dust enrichment in the stratosphere is believed to be a key factor in this process.
Researchers found that American bellflowers' colonization of new areas led to beneficial adaptations, such as self-fertilization, but also detrimental mutations reducing overall vigor. This study draws attention to climate change's potential legacies and the inherent perils of species expansion.
A single amino acid change in the light-sensing rhodopsin protein is crucial for herring adaptation to the Baltic Sea. Over 1/3 of all fish in brackish or freshwater carry this genetic change, enabling them to thrive in the region.
A new study suggests that glacial sediments played a crucial role in the emergence and evolution of global plate tectonics. The research found two major periods of worldwide glaciation, each boosting the rate of plate tectonics, which resulted in massive deposits of glacier-scrubbed sediment.
A comprehensive passerine evolutionary tree reveals the relationships among major groups, with divergence dating back to the Middle Eocene. The study suggests complex mechanisms drove diversification, contradicting associations with global temperatures or continental colonization.
Dust particles from glacial outwash plains can serve as efficient nuclei for ice nucleation, contributing significantly to ice nucleation in Arctic low-level clouds. This study highlights the impact of high-latitude dusts on glaciation and adds to our understanding of climate regulation by clouds.
Researchers from Heidelberg University discovered a large igneous province that could have triggered the Gaskiers glaciation approximately 580 million years ago. The basaltic eruptions covered an area of over 1,000 kilometers and may have led to short-term global warming before causing long-term climate effects.
Scientists have discovered the first Neanderthal footprints in Gibraltar, dated to around 29 thousand years ago. The footprints, along with those of other species, provide significant insight into the wildlife community of the Rock's past.
The discovery of ancient molecules, including bisnorgammacerane, reveals that predatory plankton played a crucial role in shaping the evolution of modern ecosystems. This finding suggests that massive predation helped 'clear' out bacteria-dominated oceans and create space for algae, paving the way for more complex lifeforms to evolve.
A team of researchers found that the closure of the Bering Strait due to glaciation caused stratification in the North Pacific, removing CO2 from the atmosphere and leading to global cooling. This discovery provides new insights into the driving factors behind the Mid-Pleistocene Transition.
A 3,980-year-old volcanic eruption on Deception Island had a Volcanic Explosive Index of 6 and ejected 30-60 cubic kilometers of ash. The caldera collapse triggered a seismic event and had significant climatic impacts in the southern region.
The Geological Society of America's 130th Annual Meeting & Exposition will offer science journalists the opportunity to meet geoscience experts face-to-face and cover scientific findings. Twenty-six pre- and post-meeting field trips will explore geological landscapes in the Midwest.
A landmark international study found the Great Barrier Reef is more resilient to sea-level rise and temperature changes than thought, but highly sensitive to sediment input and poor water quality. The reef's ability to survive is uncertain due to current stresses and projected future changes.
A team of researchers led by Maya Elrick found that a global marine anoxic event occurred during the Late Ordovician Mass Extinction, which lasted for at least 1 million years and coincided with the extinction of 85% of marine life. The study suggests that low oxygen concentrations in the ocean were a major driver of the mass extinction.
Researchers found a prolonged ocean anoxic event worldwide during the Late Ordovician mass extinction, coinciding with peak glaciation and suggesting global cooling may have driven ocean anoxia. This finding could support the theory that global cooling played a role in triggering the LOME.
A recent study suggests that early Mars was modestly warm and prone to rain, with only small patches of ice. The research challenges the long-held idea of an icy climate on Mars.
New research pushes back the first glaciation and early human appearance in central Germany by 100,000 years. The study used luminescence dating to determine the age of river deposits containing Lower- and Middle Paleolithic stone artefacts.
The study reveals that methane hydrate melts from the Arctic sea floor due to sea floor uplift, causing a slow and steady methane release over 8000 years. The research suggests that this process is more likely than ocean warming as the cause of methane seeps in the region.
A team of researchers from the University of Kansas is collecting fossilized plant remains in Antarctica to understand how plants will respond to contemporary climate change. By studying ancient plants, they aim to reconstruct the history of flora and ecosystems on a warming Earth.
A study reveals that massive coal formation 300 million years ago nearly led to global glaciation due to low CO2 concentrations. The research indicates that current levels of CO2 in the atmosphere pose a significant threat to climate stability.
Climate model simulations suggest that a significant decrease in atmospheric CO2 concentrations could have led to global glaciation. The study indicates that Earth's coal deposits formed during this period may have been the trigger for such an event.
Scientists confirm weathering of rocks is key to planet's recovery from extreme temperatures, enabling life to thrive for over 4 billion years. However, rapid global warming poses a threat to this recovery process, highlighting the need for urgent action.
A new study suggests that glaciers may have played a role in releasing carbon dioxide into the atmosphere, potentially warming the planet. The research found that glacial weathering increased the rate of carbon dioxide release, with oscillating glaciers changing atmospheric levels by up to 25 parts per million over 10,000 years.
Researchers found elevated sulfur acidification in glacial samples due to oxidized pyrite, leading to CO2 release into the atmosphere. This process may play a role in regulating Earth's climate over long cycles.
A new study reveals that the sub-antarctic island of South Georgia was covered by a massive ice cap about 20,000 years ago. The researchers used sonar mapping and gravity corers to find hundreds of distinct ridges bulldozed into the seabed, showing that the ice extended across South Georgia's vast continental shelf.
Researchers propose that massive volcanic eruptions 717 million years ago led to a perfect storm of fire and ice, causing the largest glaciation event in Earth's history. The eruptions released sulfur dioxide into the atmosphere, blocking solar radiation and driving the formation of ice.
Researchers have discovered the first occurrence of in situ preserved trilobite eggs from the Lorraine Group in upstate New York. The eggs are spherical to elliptical in shape and nearly 200 micrometers in size, providing valuable insights into the reproductive biology of ancient arthropods.
A recent study found that oxygen levels in the air began to rise around 2.4 billion years ago, coinciding with global glaciation and a single supercontinent called Kenorland. The research suggests that volcanic activity on this massive landmass may have contributed to the unstable climate leading to fluctuations in oxygen levels.
A new study has determined that the first Paleoproterozoic global glaciation and significant step change in atmospheric oxygenation occurred between 2,460 and 2,426 million years ago. The rise of atmospheric oxygen was characterized by significant oscillations before irreversible oxygenation of the atmosphere 2,250 million years ago.
A study analyzing marine sediment cores reveals East Greenland's ice sheet underwent deep glacial erosion over the past 7.5 million years, responding to global climate change. This finding challenges previous theories on complete and extended deglaciation, suggesting a more complex history of ice sheet dynamics.
Researchers sequenced coral genomes to model population histories and show that corals can recover after environmental disasters. The study confirms fossil evidence and suggests that current reef deterioration can be reversed by reducing environmental stresses.
Researchers at Lund University have mapped out an exceptionally well-preserved Stone Age site in southern Sweden, shedding light on the lives of Mesolithic humans. The discovery includes a 9,000-year-old pick axe made from elk antlers, indicating mass fishing and a semi-permanent settlement.
The Alps are steadily uplifting at a rate of 1-2 millimeters per year, with the majority of this movement attributed to the loss of the Last Glacial Maximum (LGM) ice cap. Researchers have found that 90% of today's uplift is due to the thawing of ice, rather than tectonic activity or erosion.
Scientists at the University of Montana's Flathead Lake Biological Station have documented ancient methane-derived carbon in stonefly biomass across four river floodplains. The research reveals that up to 67% of the carbon in stonefly tissue came from methane, with millennial-aged and ancient carbon sources identified.
A new marine biodiversity study reveals the impact of glacial events on subantarctic seabed animals, providing insights into the extent of South Georgia's ice sheet during the Last Glacial Maximum. The research found that most seabed species have not moved far back to recolonize the coast despite having thousands of years to recover.
New fossil discoveries from the Ediacaran Doushantuo formation in South China reveal embryonic features similar to those of living animals. The fossils display unique structures preserved through discoidal cleavage, supporting the conclusion that animal lineages evolved by the mid-Ediacaran period.
A new study of ancient graptolite fossils reveals that plankton communities began changing in important ways 400,000 years before massive extinctions. The effects of environmental degradation can be subtle until they reach a tipping point, leading to dramatic declines in population.
Scientists have discovered former subglacial lakes in Alberta, Canada, providing insights into lake formation and drainage beneath the ice sheets. The findings offer key constraints for modeling similar lake drainages beneath Antarctica and Greenland, crucial for understanding their impact on ice flow.
Scientists at TGen tracked the likely origins and dispersal of Valley Fever using genomic analysis technologies, revealing a history spanning 2 million years. The study identifies two distinct species of the fungus Coccidioides and estimates their divergence dates, providing insights into future outbreak tracking.
A new book by UC Santa Barbara geologist Arthur Sylvester explores the region's complex geology and notable features like the San Andreas Fault and Joshua Tree National Park. The guide includes 196 geo-referenced photographs, maps, and diagrams to help drivers appreciate the region's geological treasures.
A new ERC Starting Grant will fund the first systematic study on the impact of European earthworms on plant communities and soil food webs in North America. The research aims to examine the effects of higher temperatures and reduced summer rainfall on earthworm invasions, shedding light on biodiversity loss and ecosystem functioning.
A new study published in Reviews of Geophysics strongly suggests that early agriculture helped slow a natural cooling process, leading to the warmer climate we experience today. The research, led by William Ruddiman, analyzed ice-core data and ancient pollen samples to find evidence of human impact on the climate.
Scientists have long struggled to explain the rapid deglaciation of the 'Snowball Earth' period, but new research now offers an explanation for the global formation of hundreds of metres thick deposits known as cap carbonates
Researchers found that arsenic concentrations in ancient oceans varied greatly over time, coinciding with the rise and fall of atmospheric oxygen and global glaciations. This suggests that ocean toxicity played a significant role in shaping the evolution of complex life on Earth.
Researchers have discovered that climate-induced glaciation during ice ages can wear down mountains at a rate comparable to plate tectonics' ability to build them. Over a million-year period, erosion accelerated sharply due to global climate cooling, outpacing mountain building by 50-80 percent.