Articles tagged with Evolution
A new study examines the genetic basis of longevity in Galápagos giant tortoises and finds that these animals have extra copies of genes that may protect against aging and cancer. The creatures' cells respond to stress in ways that could help prevent disease.
The world's largest ammonite species, Parapuzosia seppenradensis, reached diameters of 1.5-1.8 meters around 80 million years ago. This evolution likely helped the species evade predation and survive in its environment.
Researchers discovered new species and genera related to the genus Ctenopharyngodon, revealing that grass carp originated during the Oligocene in western China. The fossil record shows a transformation from carnivorous ancestors to herbivores as the environment changed.
A 26-year study on wild white-footed mice found that mice with physical impairments survived and thrived at a rate similar to their unimpaired counterparts. Mice with impairments had greater mass and larger home ranges, but no evidence of decreased fitness.
Researchers shed light on the evolution of mammalian tusks by tracing them back to ancient mammal relatives called dicynodonts. Dicynodonts had protruding tusks in their upper jaws, but they were not always true tusks – instead, some had enamel-coated teeth that did not fit the definition.
A new study reveals that early dinosaurs, such as Mussaurus patagonicus, likely formed complex herds with adults foraging and taking care of young. Fossils found in southern Patagonia indicate an age segregation, suggesting a larger community structure where adults shared in raising the whole community.
Several lizard groups evolved teeth with multiple tips, allowing them to transition to plant-based diets and increasing speciation rates. The study also found that tooth evolution was more flexible in lizards and snakes than mammals.
Scientists have identified a previously unknown species of ground sloth, Parocnus dominicanus, from fossils found in the Dominican Republic. The species was smaller than its tree-dwelling cousins and had anatomical differences that may have allowed it to occupy lowland areas.
A new genetic study reveals hundreds of genes that evolved to be turned on or off in the human uterus during early pregnancy, shedding light on what makes human pregnancy uniquely human. These genes are involved in cell-to-cell communication, immune response regulation, and placental invasion, highlighting the importance of evolutionar...
A new study reveals that sensitive skin surfaces are overrepresented in the brain due to stronger connections between sensory neurons and brain stem neurons. This mechanism may explain why certain body parts, like hands and lips, are more sensitive than others.
A recent study reveals that snow buntings maintain their winter-level cold endurance while migrating to the high Arctic, despite a 60% population decline over 45 years. This finding suggests that these birds have an unexpected ability to cope with harsh weather conditions.
Researchers studied spider mite populations to understand evolutionary patterns of reproductive isolation, finding a positive relationship between genetic distance and isolation. The study supports the prevailing view of reproductive barrier evolution in diploid animals.
Researchers describe a new modern-looking tardigrade fossil, Paradoryphoribius chronocaribbeus, found in Miocene Dominican amber. The study reveals unique foregut organization and contributes to the scant tardigrade fossil record, providing insight into the ancient superfamily Isohypsibioidea.
Three new species of freshwater goby fish have been identified in Japan and the Philippines, with distinct color patterns indicating separate lineages. The researchers believe that different color patterns play a crucial role in maintaining these separate lineages during courtship and mate selection.
Researchers at Tel Aviv University discovered seahorses can move their head up to catch prey at incredible speeds, facilitated by a powerful flow of water and spring-like mechanism. This study sheds light on the ecology of seahorses, revealing that longer noses enable stronger suction currents for catching smaller prey.
A 63-bone fossil discovery of Archaehierax sylvestris, a 25-million-year-old eagle-like raptor, has been made in South Australia. The species is one of the oldest eagle fossils known from this period and provides insight into raptor evolution in Australia.
Researchers have identified a shortened version of the human growth hormone receptor gene, GHRd3, which may help people survive in situations where resources are scarce or unpredictable. The study found that this variant emerged around 1-2 million years ago and was more prevalent in ancient humans and Neanderthals.
A new study using machine learning uncovers 'genes of importance' in plants that help them grow more efficiently with less fertilizer, reducing economic and environmental costs. The approach also predicts additional traits in plants and disease outcomes in animals.
Researchers discovered a two-cell color detection system in lampreys, which they propose could be the evolutionary ancestor of single-cell systems in fish and reptiles. The study found that this ancient system produces similar responses to UV and visible light as modern single-cell systems.
A new study suggests that modern snakes originated from a few species that survived the Cretaceous-Paleogene mass extinction event, which wiped out dinosaurs and other species. Snakes began to diversify into new habitats and exploit new prey, leading to the emergence of diverse lineages such as vipers, cobras, and pythons.
Researchers successfully used cryopreserved sperm to fertilize coral eggs from hundreds of miles away, demonstrating the reproductive compatibility of distant coral colonies. The technique, known as assisted gene flow, has potential as a conservation tool for endangered corals and could accelerate their adaptation to climate change.
Researchers found that dogs respond differently to food rewards withheld intentionally versus unintentionally. Dogs waited longer in the 'unwilling' condition, indicating they can differentiate between purposeful and accidental actions.
A new linguistic study uses computational modeling to reconstruct the grammar of Proto-Indo-European, the ancestor of most Eurasian languages. The model provides insights into language evolution over millennia, including stable features and changes in prominence.
Researchers used evolutionary 'time travel' to study an ancient enzyme from archaea, finding a universal NTP binding motif that could be used for novel enzyme design. The study also revealed how the human version of the enzyme evolved over time.
A new fossil species, Taytalura alcoberi, has been discovered in Argentina's Late Triassic deposits. The 3D-preserved fossil provides insights into the early evolution of lepidosaurs, with its skull revealing a unique sphenodontian body type and dentition that differ from living or extinct groups.
Researchers describe two new species of fossil ctenophores from Utah with preserved nervous systems and up to 24 comb rows. These findings suggest that Cambrian ctenophores had more complex nervous systems than living species, with specific nerve tracks along the body and a ring around the mouth.
Researchers have discovered three new species of ancient mammals in North America, hinting at rapid evolution following the mass extinction of dinosaurs. The creatures, which include the 'Hobbit'-named Beornus honeyi, differ from earlier known mammals and suggest that mammals diversified more rapidly than previously thought.
The winning image by Kristen Brown depicts a school of jack fish in a spiral formation, symbolizing the beauty and bounty of oceans as well as the spiralling crisis of coral reef decline. The competition celebrates Earth's biodiversity and its evolutionary origins through six categories.
A recent study by Tel Aviv University and the Weizmann Institute found that humans are responsible for the extinction of about 10%-20% of all avian species over the past 20,000-50,000 years. The majority of extinct species were large, flightless, and lived on islands.
Researchers found medium tree finch nests with high parasite survival rates, while hybrid finches had lower rates. Nestling behaviour also predicted naris deformation due to vampire fly parasitism.
Researchers discovered three phases of growth that explain how cetaceans shift their nasal passage from a parallel to an angled orientation. This finding provides insight into the developmental process and could inform our understanding of cetacean evolution.
Researchers found that host sanctions prevent fig wasp cheating by promoting the loss of specialized morphologies and behaviors crucial for pollination. Effective sanctions enforce cooperation in fig-wasp mutualism.
Researchers studied how dominant and tolerant primate species communicate vocally. They found that more tolerant species use communication to achieve goals, while despotic species rely on aggression. The study, published in Royal Society Open Science, provides insights into the evolution of vocal communication in primates.
A 100-million-year-old side-necked turtle fossil from Texas provides evidence of marine adaptations, challenging previous understanding of the oldest known species. The discovery sheds light on the evolutionary history of bothremydid turtles and their potential migration to North America.
Researchers used directed evolution and mathematical modeling to test the Oxygen Control Hypothesis, finding that oxygen levels strongly constrain the evolution of macroscopic multicellularity. This contradicts previous theories suggesting oxygen should promote larger organisms.
Researchers discovered a new species of saber-toothed cat, Machairodus lahayishupup, that lived in North America between 5-9 million years ago. The giant cat weighed an average of around 600 pounds and could have taken down prey weighing up to 6,000 pounds.
Research reveals that pitviper species consuming more evolutionarily diverse prey produce more complex venom. The study found that the evolutionary distance between consumed prey species affects venom complexity, suggesting subtle differences in venom targets.
Researchers found that spatial constraints from the surrounding environment significantly affect tumor evolution, leading to diverse mutational patterns among patients. The study highlights the importance of tissue architecture in regulating tumor growth and behavior.
A study reveals three distinct periods of rapid species diversification in birds, linked to key adaptations for flight and diet. These events are influenced by long-term climate changes and the Cretaceous-Paleogene mass extinction event.
A team of researchers identified a new species of praying mantis thanks to fossilized wing imprints. The discovery sheds light on wing evolution among mantises and advances scientific understanding of their evolution. The study uses Reflectance Transformation Imaging (RTI) to analyze the intricate network of veins in the fossils.
Researchers uncover fossil specimens of ancient walruses in Orange County, revealing five distinct species, including two new species without tusks. The study provides insights into the dental and tusk evolution of walruses, suggesting that feeding ecology played a key role in the origin and early evolution of tusks.
The discovery of Kylinxia, a shrimp-like fossil with five eyes, has provided crucial insights into the early evolution of arthropods. The study suggests that Kylinxia represents a transitional form between Anomalocaris and true arthropods, bridging the evolutionary gap between these two groups.
A new species of ancient lizard, Kopidosaurus perplexus, has been discovered with a unique skull shape featuring curved teeth. The fossil's placement on the tree of life is uncertain, with three different evolutionary trees suggesting multiple possible positions.
Researchers from Trinity College Dublin found that male and female Sulawesi Babblers have evolved to attain different sizes on small islands, reducing competition by feeding on scarce resources. This discovery provides new insights into the importance of sexual dimorphism in island ecosystems.
Researchers analyzed woodpeckers' drumming signals to understand their function and diversification. Despite changes in structure, the amount of biological information about species identity remained consistent for 22 million years.
Researchers found that pairs of shorebirds that successfully raised chicks were more likely to divorce than those that failed. In contrast to other bird species, unsuccessful pairs tended to stick together and try again.
A large-scale study on frogs and their tadpoles found that larval and adult body sizes are significantly and positively related. The association is not completely random, with some families exhibiting strong constraints.
Researchers discovered a new ichnospecies, Karethraichnus zaratan, living on the carapace of an extinct marine turtle during the Late Cretaceous period. The species is believed to be a bivalve that formed symbiotic relationships with its host, revealing new insights into ancient paleoecology and evolution.
In unpredictable environments, brood parasites spread their reproductive risk by targeting more and diverse host species. This bet-hedging strategy allows them to adapt to changing conditions and increase their chances of offspring survival.
A team of researchers at Harvard University has used MicroCT technology to study the head morphology of Leanchoilia illecebrosa, an ancient arthropod species. The study reveals that the species had a labrum, a flap-like structure overlying the mouth opening in most modern arthropods.
A new deep-water dogfish shark, Squalus shiraii, has been discovered in the tropical waters of Southern Japan. The species boasts distinctive features, including a tall first dorsal fin and caudal fin with broad white margins.
A new study maps the world's terrestrial vertebrates and finds that human activity is impacting areas with large concentrations of evolutionarily distinct species. Regions like the Caribbean, Western Ghats of India, and Southeast Asia face unprecedented levels of devastation.
A recent study discovered that lizards in areas frequently affected by hurricanes have larger, stronger toepads than those not exposed to such storms. This suggests that hurricanes play a significant role in shaping the evolution of lizard populations across different geographic and phylogenetic scales.
A new species of green pit viper was discovered in Arunachal Pradesh, India, and is named Trimeresurus salazar. The species is characterized by its unique orange to reddish stripe on the head and body of males.
Scientists have found a second specimen of the rare South American ground beetle Nototylus balli, revealing probable antennal grooming organs. These structures are slender, flexible, and shape suggests they apply substances to antennae, likely for symbiotic relationships with ants or termites.
A neuroimaging study found that creative insights trigger a burst of activity in the brain's reward system, motivating further creative activities. Highly reward-sensitive individuals show an additional neural reward response associated with intrinsically rewarding creative experiences.
A study of 158 frog species reveals that radically shaped skulls have evolved more than 25 times in frogs. These armored frog skulls often feature intricate patterns of grooves, ridges, and pits formed by extra layers of bone, which tend to appear together with specific feeding habits or defenses.
Snakes' toxin production adapts to new diet source, maintaining predator defense. The Japanese colubrid snake Rhabdophis tigrinus accumulates bufadienolides from fireflies after switching from frogs and toads.
The discovery of Vellbergia bartholomaei, a tiny Middle Triassic lizard from Germany, provides new information about the early evolution of lepidosauromorphs. The species' unique characteristics suggest it may be a common ancestor of modern lizards and tuataras, revealing key findings in reptile evolution.
Research team led by Professor Hagit Affek analyzed chemical bonds in calcium carbonate minerals from fossilized eggs to calculate body temperatures of dinosaurs. Their study found that dinosaur body temperatures ranged from 35-40 degrees Celsius, suggesting endothermic characteristics.