Articles tagged with Evolution
Scientists created a fully-resolved family tree for shark, ray, and chimaera species to quantify their evolutionary distinctness. This research identified five priority hotspots for conservation, helping to preserve up to 26 million years of unique evolutionary history.
A new study published in PeerJ found that individuals with trypophobia exhibit a physiological response more associated with disgust than fear. The researchers used eye-tracking technology to measure pupil size and found that images of clusters of holes elicited greater constriction of the pupils, a response linked to feelings of disgust.
A new species of marine worm Xenoturbella has been discovered, providing insights into the early evolution of complex animals. The discovery sheds light on the origins of structures such as kidneys and a centralized nervous system.
A new study identifies nearly 50 shifts from nocturnal to daytime behavior in butterflies and moths, challenging previous assumptions about their activity patterns. The research suggests that the earliest ancestor of butterflies and moths flew during the day, contrary to earlier thought.
Researchers from UC Davis predict certain traits, such as internal fertilization and long-distance mating signals, can help rare species persist during crises. These traits may provide advantages for chronically rare species when compared to more common species that are likely to face extinction during great extinction events.
A new giraffid species, Decennatherium rex, has been found in Spain, providing insights into the evolution of giraffe ancestors. The fossil, dating back to the late Miocene, features an unusually complete skeleton, shedding light on the evolutionary relationships between sivatheres and samotheres.
Researchers have discovered an Alvarezsaurid dinosaur fossil in Uzbekistan, revealing distinctive characteristics that set it apart from other species. The findings provide evidence for the continent's role in the species' evolutionary history.
A new species of ichthyosaur, Protoichthyosaurus applebyi, has been identified from a fossil at the University of Nottingham. The specimen is significant due to its rarity and uniqueness, providing valuable insights into Britain's early fossil past and ichthyosaur evolution.
A study published in Nature Ecology & Evolution found that the protein GDF11 plays a crucial role in determining the position of the hindlimb in tetrapods. The researchers discovered that species-specific hindlimb positioning is linked to changes in the timing or rate of GDF11 expression during embryonic development.
Researchers discovered a new species of brittle star, Teleosaster creasyi, preserved in a 275-million-year-old fossilized meadow in Western Australia. The species shows evidence of evolution before the Permian-Triassic extinction event, which wiped out over 90% of marine life.
Despite massive climate change and volcanic eruptions, larger fish were no more likely to go extinct than small fish during the Permian-Triassic mass extinction. The study used a detailed analysis of fossil records to conclude that body size played no role in determining which species survived or went extinct.
A newly discovered ancient whale species offers insights into the evolution of filter feeding in whales. Researchers found that this transitional species used its large molars for filter feeding, suggesting a key step in the development of baleen.
Researchers found that Himalayan species arose earlier in southern Tibet and then migrated to the region after mountain formation. The discovery challenges current biogeographical opinions and highlights the importance of molecular-genetic methods in testing old hypotheses.
Cin-Ty Lee, an earth scientist at Rice University, has won a Guggenheim Fellowship to investigate how continents emerged from oceans and their effect on nutrient cycling. He will explore crystal growth and kinetics in magmatic and hydrothermal conditions.
Scientists have found a new species of tyrannosaur dinosaur with a high degree of tactile sensitivity, similar to crocodiles. The discovery provides insight into the evolution and life appearance of tyrannosaurs, revealing that their faces were covered in scaly protective layers and highly touch-sensitive snouts.
A new tyrannosaur species, Daspletosaurus horneri, has been discovered with an unusual mode of evolution called anagenesis. The research reveals a complex sensory web derived from the trigeminal nerve, similar to humans, and a lipless mask of large scales covering its face.
A team of European paleontologists challenged the fundamentals of echinoderm evolution by discovering that some ancient groups survived the end-Paleozoic extinction. The findings revealed that these surviving echinoderms coexisted with modern sea urchins and brittle stars, stretching across various paleo-environments by the late Triassic.
Researchers found that the most successful phyla have a skeleton, live on land, and are parasites. This suggests that traits like having eyes or complex organs may not be primary drivers of species diversification. The study sheds light on why some groups have branched into many species while others remain relatively few.
Monash University scientists have uncovered evidence of how baleen whales evolved from biting prey with teeth to filtering using baleen. The discovery sheds light on the complex evolutionary change that led to the rise of filter-feeding in these massive creatures.
The discovery of Qilinyu, a fossilized placoderm with a three-part complex jaw, confirms the evolution of this trait within the placoderm system. The findings suggest that the emergence of jaws in vertebrates marked a significant turning point in early vertebrate evolution.
A new Patagonian fossil has provided insights into the skeletal anatomy of megaraptors, a highly specialized group of Mesozoic predators. The species, Murusraptor barrosaensis, shares unique features with other megaraptors, but also boasts distinct facial and hip bone characteristics.
Early life forms on Earth are likely to have mutated and evolved at much higher rates than they do today, thanks to a hotter planet billions of years ago. The rate of spontaneous DNA mutation was at least 4,000 times higher than it is now, according to a new analysis from the University of North Carolina.
Researchers found that 33 different fish families demonstrate some terrestrial activity, with behaviors evolving independently in various species. Blennies, intertidal fish, were studied in seven Pacific and Indian Ocean locations, showing an amphibious lifestyle has evolved repeatedly.
Over 90% of mammal species were wiped out by the asteroid that killed dinosaurs, but they recovered rapidly and diversified in different regions. The recovery took just 300,000 years, with small mammals being key survivors.
A new marine reptile fossil, Sclerocormus parviceps, challenges the idea of slow evolution. The ichthyosauriform had a short snout and whip-like tail, suggesting rapid diversification at the end of the Lower Triassic period.
Researchers have discovered that dung beetles evolved from a single common ancestor, with the onthophagines and oniticellines tribes making up half of the world's dung beetle fauna. These beetles play a crucial role in ecosystems by recycling nutrients and reducing parasites.
Researchers found fossils in Japan that suggest tritylodontids co-existed with early mammals for millions of years, overturning the widely accepted theory about their extinction. The discovery sheds new light on the ecological dynamics of these animal families.
The earliest definitions of time were based on observed astronomical phenomena, while modern times are derived from atomic properties. The paper reveals how these definitions have evolved over time, highlighting the connection between astronomic and atomic time.
A new bird species, Chongmingia zhengi, discovered in China's Early Cretaceous Jehol Biota, sheds light on the early evolution of birds. The species is basal to dominant Mesozoic avian clades and represents a new avialan lineage.
A new study in Behavioral Ecology suggests that young male western bluebirds may benefit from living with their parents as helpers for a year before starting a nest of their own. This cooperative breeding strategy can increase both the parents' and the helper's lifespans, as well as reproductive fitness.
Research at Duke University reveals that larger rolling stones and turbulent eddies exhibit the same life span, travel distance, and number of revolutions as smaller counterparts. The findings demonstrate the constructal law's applicability to non-biological systems, challenging traditional views on evolution.
Eight new species of whip spiders found in Brazilian Amazon, with diversity of Amblypygi species now at 25, threatening habitats from iron mining and dam flooding. Conservation efforts recommended to preserve their increasingly threatened habitat.
The study found that different subspecies of western rattlesnakes have distinct head shapes, which have evolved to accommodate feeding and reproductive behaviors. Combining head shape with genetic analysis confirmed that some groups should be classified as separate species.
A global assessment reveals that marine protected areas (MPAs) insufficently protect the evolutionary history of tropical corals and fishes, with less than a quarter of wrasse species receiving minimum protection levels. The study suggests that protecting the genetic history of living organisms is crucial in a changing world.
Researchers reveal that facultative parthenogenesis is prevalent among snake species, with potentially significant implications for vertebrate evolution. The study proposes splitting this phenomenon into two forms and identifies snakes as ideal model species to investigate the evolution of vertebrate parthenogenesis.
A new UBC study found that predators can help prey species evolve quickly in response to climate change. In experiments with tiny water fleas and predatory fly larvae, populations evolved rapidly when predators were present, highlighting the importance of conserving entire ecosystems.
A tiny beetle fossil, over 99 million years old, has been discovered in Myanmar's Burmese amber, providing tangible evidence for the evolution of the Histeridae family. The fossil, named Cretonthophilus tuberculatus, offers a unique window into the past, revealing details about its anatomy and behavior.
A recent discovery of a small-bodied ape in Spain shares features of both catarrhines and great apes, suggesting that the last common ancestor of all apes may have been less great ape-like than previously assumed. This finding has significant implications for our understanding of hominoid evolution.
Research found that young male chimpanzees spend more time manipulating objects in play, but it does not prepare them for adult tool use. In contrast, immature females show a greater diversity of manipulation types and learn to use tools earlier.
Researchers discovered the evolution of the giraffe's long neck involved two stages, with the first stage elongating only the front portion of the C3 vertebra and the second stage extending the back portion. The study found that modern giraffes are the only species to undergo both stages.
Two new frog species have been discovered in the Raja Ampat Islands of New Guinea, characterized by their unique advertisement calls and morphological features. The specimens were found to be hermaphrodites, possessing both male and female reproductive systems.
Scientists have discovered seven new land snail species in China, including two that are among the world's smallest, measuring less than 1 mm in height. These tiny creatures pose challenges for scientists studying biodiversity and evolution.
Researchers develop framework to measure cheating in mutually beneficial relationships, finding evidence scarce. The study aims to stimulate mechanistic studies and improve understanding of human interactions by recognizing that not all bad partners are necessarily cheaters.
A collaborative study will synthesize scattered information about butterflies, placing it in an evolutionary context to study broad-scale patterns of ecology and evolution. The project aims to assemble a database of biological information about each species, making it available to the public via a website.
In a study on Latin American butterflies, researchers found that males without scent-producing organs do not co-occur with their closest relatives. This suggests that the loss of male scent pads may be linked to geographic isolation, allowing species to avoid competition for mates.
A study in the Chocó-Andes of Colombia found that intensive farming practices lead to a loss of more than 650 million years of evolutionary history in bird species. Land-sparing approaches, which protect larger blocks of natural habitat, are recommended as a more effective way to preserve biodiversity.
A new study by an international team of scientists found that competition from cats drove the extinction of many ancient dog species. The researchers analyzed over 2000 fossils and discovered that felids had a deadly impact on the diversity of the dog family, contributing to the demise of up to 40 species.
A 333-million-year-old fossil discovery is rewriting the history of vertebrate evolution. The ancient salamander-like animal spent significant time on land, challenging previous theories about its origin.
A new study uses fossil data to predict that most rodent species will evolve continuously growing molar teeth over the next 50 million years. The researchers found evidence that many species possess the potential for acquiring dental stem cells, which are required for continuous tooth growth.
New research reveals that cichlid fish courtship rituals evolve rapidly in response to feeding depth. Castle-building males live at shallower depths, while pit-digging males thrive at greater depths, driven by differences in eye structure and display behavior.
A recent study published in Nature journal Scientific Reports found that the Asian monsoon played a crucial role in the evolution of African mole rats and bamboo rats. The researchers discovered that changes in monsoon strength over 24 million years influenced the rodents' teeth, head shape, and digging behavior.
Researchers discovered a type of sulfur bacteria preserved in rocks over 1.8 billion years old, which remain unchanged and indistinguishable from modern bacteria found in the same region. This finding supports Charles Darwin's theory of evolution by suggesting that evolution occurs only when environmental conditions change.
Researchers have discovered a new group of tiny animals, specialist driftwood talitrids, that live on and feed from decomposing marine driftwood. These hitchhikers use floating driftwood logs to disperse across distant oceanic islands, with adaptations like dwarfism allowing them to survive long journeys.
Research by Queen's University biologist Paul Martin found that smaller bird species can overcome size disadvantages when interacting with distantly related species. The study examined 23,362 aggressive interactions among 246 bird species pairs and identified specific traits that enhance small species' abilities in conflicts.
A new study finds that diversified farming systems retain more evolutionary history than intensive agriculture, suggesting a strategy for conserving biodiversity. This is encouraging news as human activities drive half of known life to extinction.
Researchers applied evolutionary game theory to analyze disease outbreaks, identifying four key outcomes influenced by government response and healthcare provision. The approach has been tested with actual data from the 2009 influenza outbreak and may inform quarantine measures for future pandemics.
A new study reveals that marine crocodilian diversity is closely tied to sea temperature, with colonisation events occurring during global warming periods. The research suggests that environmental temperatures constrained the evolution and lifestyle of modern crocodilians.
A 107-year-old beetle specimen was rediscovered and described as a new genus and species. The beetle, Rhipidocyrtus muiri, was collected in Borneo in 1907 and had been separated from its body for over a century.
Researchers dispel the idea of evolutionary trade-offs between plumage and song in a large study of tanagers, a family of songbirds from Central and South America. The study found that some species can exhibit both flashy colors and complex songs without sacrificing one for the other.
Researchers explore how fluctuating sea levels impacted the Galapagos Islands' ecology over thousands of years. The study reveals that shallow 'land bridges' between volcanic outcroppings allowed landlocked species like snakes, geckos, and iguanas to thrive.