Articles tagged with South America
A comprehensive study confirms the existence of a single ancestral population for all Amerindian ethnic groups, contrary to traditional theories linking Africa or Australasia. The study reveals that the Lagoa Santa people were descendants of Clovis culture migrants from North America.
A study of ancient DNA from 49 individuals in Belize, Brazil, and the Central Andes reveals that most Central and South American ancestry originated from at least three different streams of people entering from North America. The research also detected two previously undocumented genetic exchanges between North and South America.
Researchers uncovered genetic adaptations in ancient Andeans, including cardiovascular modifications and a starch-digesting enzyme variant, allowing them to thrive in the harsh environment. The study suggests that these adaptations enabled highlanders to survive European contact with less population decline than lowlanders.
A study of ancient DNA from Central and South America has revealed two previously unknown genetic exchanges between North and South America, including a continent-wide population turnover. The findings suggest that the Clovis culture had a major demographic impact further south than previously thought.
Research by Rebstock and Boersma found that Río de la Plata's plume affects female penguin body conditions, but not males. A weaker plume may increase prey density and visibility, helping females catch fish.
A new study by Lund University researchers has found that the Inaccessible Island rail, also known as Atlantisia, flew to its island habitat from South America around 1.5 million years ago. This discovery contradicts a previous theory suggesting the bird's inability to fly was an ancient trait.
A new species of insect, Propiestus archaicus, found in Burmese amber is a relative of modern flat rove beetles that lived under tree bark. The beetle's flattened body and short legs suggest it was adapted to life in the Late Cretaceous era, helping scientists understand how continents shifted millions of years ago.
A new study reveals that humans may have cultivated plants as far back as 4,800 years ago in Southern Brazil. The analysis of ancient human remains found teeth and bones rich in carbohydrates, suggesting a diet rich in cultivated yams and sweet potatoes.
A decade-long genetic analysis of grasshopper relationships reveals the origin of the broadest lineage of grasshoppers in South America. The study's findings challenge previous assumptions and suggest major shifts in grasshopper classification.
Researchers at Case Western Reserve University and other universities have discovered two new species of extinct hoofed mammals known as litopterns from a site in Bolivia. The animals, dating back to the late Miocene epoch, provide insights into South America's rich diversity of living mammals.
A new phylogeny of the Pleurodira suborder, including the Yellow-spotted Amazon River turtle, provides insights into the evolutionary history and biogeographical distribution of side-necked turtles. The study found that Pleurodira fossils are scattered across continents, with the oldest species dating back to 125 million years ago.
The discovery of Brasilestes stardusti, the oldest known mammal in Brazil, is a significant find that sheds light on the evolution of mammals during the Mesozoic Era. The species was named after British rock star David Bowie and is believed to be a placental mammal.
New research reveals tens of thousands of sea turtles are caught each year by small-scale fishers off South America's Pacific coast, with over 16,000 killed. The study highlights Ecuador and Peru as key places to tackle this issue, which threatens critically endangered species like leatherbacks and hawksbills.
Research suggests that Indigenous peoples in Central and South America retain DNA from the northern branch, which originated from eastern Canada. The study reveals a 'reconvergence' of two ancestral branches around 13,000 years ago.
A new magnetometer network has been installed across South America to study magnetic field disturbances and their potential impact on electronic appliances and power grids. The project aims to improve the understanding of space weather effects on the continent, which could help mitigate damage caused by solar eruptions.
Researchers studied 4,450 species in American tropics, finding Amazonia as primary source of diversity, with over 2,800 lineages. The study highlights the role of dispersal in assembling regional biotas across Mesoamerica and northern South America.
A study links North Atlantic iceberg discharge to increased South American monsoon precipitation, leading to higher global atmospheric methane levels. The research provides new insights into the tropical hydrologic cycle and its implications for climate change.
Researchers found that geological events like mountain formation and wetland disappearance drove diversification of Annonaceae plant genera in Central and South America. The study used DNA data and molecular clock technique to reconstruct the phylogenetic history of 11 Mosannona and 24 Cremastosperma species.
Researchers sequenced an ancient Taino individual's genome, finding a strong genetic connection to present-day Arawakan speakers from northern South America. The study suggests the Taino people originated from this ancestral population, illuminating early Caribbean peopling and European colonization impacts.
Researchers identified unexpected geophysical signals beneath stable continental interiors of South America and Africa, suggesting recent geologic activity. Cratons, ancient rocks on Earth's surface, may have experienced delamination, a process where the denser lower mantle layer peels away from the buoyant upper layer.
The study presents a comprehensive checklist of 124,993 plant species across North and South America. Notably, the vast majority of plant species in the Americas are found in just one country or region, with Brazil having the most diverse flora. The authors predict an additional 25,000 species will be documented by 2050.
A new study by University of Cambridge researchers found that low national governance is the strongest predictor of declining species numbers. Protected areas do maintain biodiversity when situated in stable countries with strong legal and social structures.
Rock engravings in Western Venezuela, dating up to 2,000 years old, have been mapped in unprecedented detail. The largest panel contains 93 individual engravings, including depictions of animals, humans, and cultural rituals.
Researchers found that Noir Marron communities in French Guiana and Suriname have remarkably preserved their African genetic heritage, unlike African-descendants from Brazil and Colombia. The study sheds new light on the history of enslaved Africans in greater detail.
A team of international experts has re-evaluated a radical proposal to split dinosaurs into two new groups, finding that the evidence is not strong enough to overthrow traditional classification models. The study suggests that the most likely site of origin for dinosaurs is still in the southern hemisphere, particularly South America.
A study analyzing tree-ring fire scars reveals a strong connection between drought driven by the Southern Annular Mode and regional fire activity. The research suggests that SAM-mediated droughts may drive widespread wildfire activity in southern South America during the 21st century.
Two new species of fish, Leporinus enyae and Leporinus villasboasorum, have been named by scientists from the Orinoco River drainage after Irish singer Enya. The discoveries highlight the region's biodiversity and the importance of preserving unique lineages.
A new species of South American rabbit has been discovered by Portland State University researcher Luis Ruedas, who found the creature to be larger and shaped differently from its cousins. The discovery is significant as it will require renaming other rabbit species in the region, potentially affecting conservation efforts.
New study suggests that ancient humans entered South America in at least two waves of population dispersals from Asia. The findings, published in Science Advances, rely on a pioneering method to analyze cranial morphology and contemporary genomic data, providing new insights into the complex narrative of human migration.
Researchers found that people prefer large, widespread species for basic needs like food and medicine due to their ability to produce large quantities. In contrast, smaller palm species are often used for psychological and self-actualization needs with less dependency on biological traits.
A new study suggests the Galapagos Islands' incredible biodiversity emerged approximately 1.6 million years ago when the Equatorial Undercurrent collided with the archipelago, bringing nutrient-rich waters to the surface. This event allowed for the growth of unique plants and animals that thrive in the islands' ecosystem.
A new epidemiological model reveals that climate change and the 'Godzilla' El Niño of 2015 fueled the Zika outbreak in South America. The researchers predict a potential seasonal transmission risk for Zika virus in southern US, China, and Europe during summer.
Scientists discovered remnants of freshwater plants and animals in the Atacama's salt flats, indicating the presence of lakes and wetlands between 9,000 and 25,000 years ago. The findings suggest an alternative path for early settlers through the desert, potentially providing homes and sustenance.
A phylogenetic analysis supports transoceanic dispersal of Amaurobioides genus across Southern Hemisphere continents. The study suggests that an ancestral population existed on ancient supercontinent Gondwana and dispersed eastward during the Miocene era.
Researchers confirm cluster of cases in Chile, suggesting wider global distribution than previously understood. Scrub typhus kills at least 140,000 people annually and is transmitted through mite bites.
A study published in PLOS ONE identifies three new cryptic species within the Tegu lizard family, including subtle differences in leg scale morphology and substantial genetic divergence. The discovery may aid conservation efforts for these heavily exploited species.
New research reveals that continental breakup proceeds through a two-phase speed evolution, where initial slow extension is followed by rapid acceleration. This process can lead to the formation of rifted continental margins with enhanced faulting and volcanic activity.
History professor María Bárbara Zepeda Cortés is searching 'The Gálvez Papers' at The Huntington Library in California to understand the impact of this wildy successful Spanish reformer. She seeks insights into how Gálvez empowered regional leaders, transformed borders and created surprising ways in the region.
Researchers discovered that surales, large mounds in tropical wetlands, are largely composed of earthworm casts. These mounds vary in size and form due to the repeated actions of individual earthworms, which deposit casts that eventually become mounds.
Scientists find 21-million-year-old fossil evidence of mammals traveling from South America to North America. The discovery sheds light on the evolution of Western Hemisphere monkeys, revealing they stopped migrating north due to a barrier of North American vegetation.
The discovery of the fossil monkey provides evidence for the interchange of mammals between South and North America, challenging long-held views of South America as an island continent. The new genus and species, Panamacebus transitus, suggests that monkeys may have unintentionally rafted across on mats of vegetation.
The discovery of seven fossil teeth in the Las Cascadas Formation reveals a long-lost monkey species on the North American continent before the Isthmus of Panama connected it to South America. The new species, Panamacebus transitus, was named after Panama and its movement across the ancient seaway.
Researchers assembled largest mammalian phylogenomic dataset to test models of molecular evolution and confirm findings that Atlantogenata is the sister group to all other placentals. The study resolves the controversy over placental mammal family tree, revealing that Afrotheria and Xenarthra diverged from each other around 90 million ...
Researchers at Kansas State University have successfully identified a resistance gene called 2NS and developed diagnostic tools to detect the disease. The team is working on finding new sources of resistance to overcome the constantly evolving fungus.
The Zika virus is primarily transmitted by Aedes mosquitoes, which also spread dengue and chikungunya viruses. Physicians should be aware of symptoms in travelers returning from affected regions and consider Guillain-Barré syndrome and microcephaly as potential complications.
A collaborative study published in Nature finds that secondary tropical forests, especially those in wetter areas, can regain almost all their biomass within 70 years. This information provides significant insights into the resilience of these ecosystems and will help policymakers prioritize forests for conservation.
Three new species of fishing snakes were identified in the Andean cloud forests of Amazonian Ecuador and Peru, with differences found in scale features, male sexual organs, and DNA. The discovery expands the Synophis genus to eight members and highlights the biodiversity hotspot in western South America.
Researchers have linked the Irish potato famine pathogen to a fungus-like organism from South America using ancient DNA. The study suggests that early European activities in the New World led to the origin of this devastating pathogen.
A new species of lizard, Gueragama sulamericana, has been found in Southern Brazil, pushing back the known origin of acrodontan lizards to 80 million years ago. This discovery sheds light on the migration patterns of ancient species and challenges existing hypotheses on lizard evolution.
A new snail species, P. cecepeus, was found in a Madrid museum's collection of over 150 years, highlighting the need for revising historical collections.
Researchers from Brazil and Canada have found a species of fungus gnats feeding on mushrooms in South America. The study provides valuable insights into the life stages of these tiny insects and their interactions with fungi.
A comprehensive biological study refutes a long-standing geological fact, showing plants and animals migrated between North and South America nearly 30 million years ago. This new information changes our understanding of biodiversity and climate, both at regional and global levels.
A new study by University of Gothenburg researchers shows that species migration across the Isthmus of Panama began about 20 million years ago, contradicting previous assumptions. This early exchange enhanced the region's extreme biodiversity.
Researchers compared plant taxa to climatic history and habitat information to provide new insights into plant dispersal patterns. The findings suggest that some plants escaped extinction by dispersing from Antarctica millions of years ago, improving the accuracy of climate change prediction models.
A study of 25 snake species in South America found that their diets were more influenced by phylogeny than ecology. The research suggests that the snakes' ancestry plays a significant role in determining their diet, with some species relying on soft-bodied invertebrates.
A team of researchers has identified the first fossil specimens of a major group of killifishes that is widely distributed in freshwater habitats today. The fossils, which date back to 6 million years ago, provide new insights into the evolution of bony fishes and the diversification of species.
A team of Brazilian and English zoologists has developed a comprehensive guide to identifying 19 species of planktonic copepods from the 'de la Plata' basin, the second largest river basin in South America. The study provides detailed information on taxonomy, phylogenetic relationships, and identification keys for each sex.
New zircon dating evidence challenges accepted theories on the rise of the Isthmus of Panama and its impact on global climate change. The closure of the Central American Seaway is now dated to 13-15 million years ago, contradicting previous estimates.
Scientists have discovered three new species of dragon-like woodlizards in the Andes of Peru and Ecuador, increasing the total number of species to 15. The new species differ from their closest relatives in scale features, coloration, and DNA.
Researchers from Ohio State University discovered a layer within the Quelccaya Ice Cap containing lead and bearing the chemical signature of Potosi silver mines, providing the first detailed record of widespread human-produced air pollution in South America before the industrial revolution