Articles tagged with South America
A new family tree of hummingbirds reveals a rapid diversification rate, with over 140 new species emerging in the Andes and more than 338 recognized species worldwide. The study shows that hummingbirds continue to evolve and generate new species today, driven by coevolution with plants.
A decade-long study reconstructed the hummingbird family tree and found that they have been diversifying rapidly and adapting to novel environments. The researchers discovered nine principal groups or clades, a unique relationship with flowering plants, and continued spread into new geographic areas.
Researchers found a clear signal of climate change's impact on malaria, with cases shifting to higher elevations in warmer years and back down in cooler years. Climate warming is expected to increase malaria cases in tropical highland areas, particularly in Africa and South America.
Researchers investigated the break-up of supercontinent Gondwana, finding that a nearly orthogonal West African rift was stopped by an opposing Equatorial Atlantic rift, preventing the formation of a Saharan Atlantic Ocean. This study highlights the importance of rift orientation and extension direction in shaping Africa's margin.
Researchers are working to conserve the high diversity of potatoes found in South America, where over 5,000 varieties exist. A top-down approach using remote sensing and bottom-up knowledge from local farmers is being used to identify agrobiodiversity hotspots and create strategies for sustainable use.
Fossilized jawbones and teeth from northern Egypt confirm the existence of a primitive lineage of bats, which eventually spread to South America. The discovery sheds light on the evolutionary history of sucker-footed bats, which roost head-up using wet adhesion.
A new sauropod species, Yongjinglong datangi, has been discovered in northwestern China, providing insights into the diversity of Titanosaurs. The fossil remains suggest that the animal was a juvenile or subadult, with features indicating potential for growth and increased size in adults.
Paleobotanists discover complete fossil remains of Agathis trees from Australia to South America across Antarctica, revealing its vast range and adaptability. The findings provide insights into climate change's impact on the tree's distribution.
After landing in South America, monkeys forged their own niches, evolved new forms, and spread to Caribbean and Patagonia. The study reveals how primate migration and evolution in the Americas were influenced by ancient climates, geology, and geography.
The buff-tailed bumblebee, introduced to Chile in 1998, has spread rapidly throughout South America, outcompeting native species and potentially disrupting the ecosystem. The parasite Crithidia bombi is a key factor in the decline of native bumblebees.
A new genus of electric fish, the Akawaio penak, has been identified in the upper Mazaruni River in northern Guyana. The discovery represents a significant finding for biodiversity research, as the region is a hotspot for unique and isolated species.
A study by the University of New South Wales reveals that global warming may lead to a decline in seasonal water storage capacity for Argentina and Chile. The North Patagonian Ice-field, vital to maintaining this capacity, is expected to shrink due to changes in westerly winds.
The critically endangered Chinese species Passiflora kwangtungensis has been rediscovered in Hunan Province, highlighting its high population size decline and limited genetic diversity. The plant's rarity is attributed to deforestation and geographical isolation, emphasizing the need for conservation efforts.
New fossil discoveries shed light on the history of animal distributions between the Americas, revealing that caimans dispersed north from South America by the early Miocene. The presence of fossils in Panama supports a recent hypothesis that Central and South America were closer together than previously thought.
A new species of forcepfly (Mecoptera, Meropeidae) was discovered in Brazil's Atlantic Forest biome, representing the third extant species described in this family. The discovery highlights the importance of conservation efforts for this threatened ecosystem.
After 121 years, researchers have correctly identified the 'grave robber' fossil as a unique branch in the evolutionary tree. The discovery pushes back the endpoint for the fossil's lineage by 45 million years and shows that this family of mammals survived the extinction event that marked the end of the Age of Dinosaurs.
A new digital compilation of geological data provides valuable insights into the seismic hazards associated with active fault zones. The Active Tectonics of the Andes Database includes over 400 mapped faults and will allow geoscientists to better understand the long-term history and evolution of deformation in fault zones.
A new study published in PLOS ONE reveals that over 6 million birds die every year at communication towers during migration, primarily due to getting caught in cables. Replacing steady-burning lights with blinking ones on approximately 4,500 towers could potentially reduce mortality by 45%.
A team of ecologists found that Central European meadows and long-grazed grasslands are the most species-rich areas on Earth, with some regions boasting over 942 plant species per hectare. The study's findings predict a total of 219,204 species globally, remarkably close to current estimates of 275,000 species.
Researchers have discovered an extremely old anthropomorphic figure engraved in rock in Brazil, dating back to between 9,000 and 12,000 years ago. The find supports the hypothesis that humans settled the New World relatively early and suggests a diverse range of symbolic thinking among early American settlers.
The ICTP South American Institute for Fundamental Research (ICTP-SAIFR) will focus on areas like gravitation, particle physics, and field theory. The center will host visiting researchers, organize schools and workshops for PhD students, and hire permanent professors to promote scientific excellence in South America.
Researchers have found evidence of ancient popcorn in Peru, dating back 6,700 to 3,000 years. The discovery provides valuable information on the evolution of corn and its adaptation to different environments.
Researchers found that cold periods in the Northern Hemisphere are associated with increased precipitation in the Amazon Basin, while warm-cold climate oscillations influence South American rainfall. This study provides new insights into the relationship between Antarctic temperatures and Southern hemisphere rainfall cycles.
Paleontologist Guillermo Rougier and his team have reported the discovery of two skulls from the first known mammal of the early Late Cretaceous period in South America. The fossils provide a complete picture of the skull for the group, including extremely long canine teeth and a narrow muzzle.
The discovery confirms that early rodents had origins in Africa and pushes back the date of the first South American rodents to at least 41 million years ago. The fossils found include three new species of rodent from the suborder Caviomorpha, which are most closely related to African rodents.
By 2018, an estimated 2.3 billion people worldwide will experience at least one lower urinary tract symptom, with increases expected in Africa, Asia, and South America. The study highlights the urgent need for public awareness, prevention, diagnosis, and management of these conditions to tackle the growing burden.
Scientists have found a new family of wasps in North American amber, which are closely related to families found in South America and southern Africa. The discovery sheds light on the origins of stinging wasps and their distribution patterns.
Scientists uncover ancient fossils of Coxoplectoptera, an insect order that defies classification, offering clues to the evolution of wings and lifestyle. The discovery presents a new hypothesis on the development of insect wings, suggesting they originated from thoracic backplates.
A recent study of decades of data from the US and eight other countries found significant funding disparities between over-represented and under-represented states. Over-represented provinces can expect to receive more than twice the federal funding per capita as under-represented ones.
Researchers analyzed wild Mexican, Central, and South American blueberries finding two types to be extreme super fruits with significantly more antioxidants than commercial varieties, potentially offering enhanced protection against heart disease and cancer.
Hugo Yepes, a renowned Ecuadorian seismologist, will be honored by the Seismological Society of America for his groundbreaking work on earthquake and volcanic mitigation. His research has improved hazard assessment and risk reduction efforts in Ecuador and South America.
Researchers have discovered thousands of human artifacts in Texas that predates Clovis culture by 2,500 years, expanding evidence for earlier cultures in North America. The pre-Clovis toolkit includes biface and blade technology, which may have later been adapted by the Clovis culture.
A team of paleontologists discovered a nearly complete skeleton of Eodromaeus, a long-necked and tail dinosaur weighing only 10-15 pounds, in the 'Valley of the Moon' in Argentina. The species lived around 230 million years ago during the dawn of the dinosaurs.
Scientists studied ancient bird migration and found that northern birds had the ability to cross the land bridge, while southern species were restricted. The study reveals an uneven species migration pattern, with many New World oscine species breeding in South America despite having northern origins.
A genetic analysis reveals that flu strains in the US don't disappear at the end of winter, but instead migrate to South America and other parts of the world. This knowledge has implications for public health efforts, including antiviral use and vaccination programs.
A new fossil turtle species, Cerrejonemys wayuunaiki, was found in the Cerrejon coal mine in Colombia, dating back to 60 million years ago. The thick shell may have protected it from predators like the Titanoboa, a snake thought to be the world's biggest.
Surgeons demonstrate a new minimally invasive technique to correct pectus carinatum, a condition causing the chest wall to protrude outward. The 'reverse Nuss' procedure involves passing a curved bar beneath the musculature to push out the indentation. A dynamic compression brace can also be used to correct the condition in many cases.
A Scripps-led study found that extremely long waves originating along Pacific coasts may destabilize Antarctic ice shelves. The researchers propose that infragravity waves could initiate ice shelf collapse by opening crevasses and reducing ice integrity.
The discovery of Tawa, a new meat-eating dinosaur, has resolved a long-standing debate about the evolutionary relationships between dinosaurs. The fossil remains reveal that Tawa shares characteristics with both theropod and non-theropod dinosaurs, confirming Herrerasaurus as a member of the theropod lineage.
A University of British Columbia study found that tropical birds waited until the formation of the Isthmus of Panama land bridge to migrate northward, revealing a key role in biodiversity exchange. The research suggests that many tropical bird species were reluctant to fly across open water and instead waited for the land bridge comple...
A recent study by University of Oklahoma's Cecil Lewis explores genetic ancestry influences on health and population genetics. The research finds that eastern South America has more genetic diversity than previously expected, contradicting the widely accepted peopling timeline.
Isolongifolenone, a natural compound found in the Tauroniro tree, has been proven effective in deterring mosquito bites and repelling ticks. The findings suggest that isolongifolenone could be a cost-effective alternative to DEET for protecting against blood-feeding arthropods.
Researchers found that these diet pills contain a range of addictive substances, including amphetamines, benzodiazepines, and diuretics. Physicians are advised to be aware of the dangers of these imported diet pills, which can cause serious side effects such as chest pains, palpitations, and insomnia.
A new University of Florida study reveals that the Isthmus of Panama was formed by a Central American Peninsula colliding with South America, contradicting previous evidence. The research uses geologic, chemical and biologic methods to date rocks and fossils found in the Gaillard Cut of the Panama Canal.
A new DNA study from the University of Adelaide has challenged long-held claims of pre-historic Polynesian contact with South America. The study found no evidence to support the idea that chickens were introduced to South America by Polynesians before Spanish arrival.
A study led by Dr. Scott Solomon found that ice age climate change and ancient flooding contributed to the evolution of new insect species in the Amazon region. The researchers tested three hypotheses, concluding that riverine barriers cannot explain the region's high biodiversity.
Researchers analyzed bird migration patterns in eastern Massachusetts and found that 8 out of 32 species are arriving earlier due to warming temperatures. Species that winter in the southern US are generally keeping pace with climate change, while those further south are slow to adapt.
A study by Bart Minten found that global supermarket chains charge significantly higher prices for food in poor countries, making affordable options inaccessible to the majority. In Madagascar, shoppers preferred locally sourced foods at lower margins over imported goods from multinational chains.
A new study confirms Djarthia, Australia's earliest known marsupial, is a primitive relative of the Monito del Monte, a South American marsupial also believed to be a living fossil. The findings suggest the Monito del Monte may have returned to Australia from South America before Gondwana broke up.
A 70-million-year-old giant frog fossil from Madagascar has been identified as a relative of living Horned toads, providing evidence for the link between Madagascar, India, and South America during the Late Cretaceous period. The discovery sheds light on the paleobiogeography of Madagascar's unique fauna.
A study of mitochondrial DNA reveals that piranhas' modern species originated from a recent diversification event triggered by marine incursions into the Amazon Basin. The researchers propose that factors like water quality and geographical history played a crucial role in shaping the diversity of these fish species.
Researchers have discovered fossilized cashew nuts in Germany, dating back 47 million years, which suggest that the genus Anacardium was once distributed in Europe. This finding indicates that Europe may be an important biogeographic link between Africa and South America, challenging previous theories.
A study published in The Lancet found that daytime and nighttime blood pressure are both predictive of cardiovascular events, with nighttime blood pressure predicting mortality. The study suggests recording ambulatory blood pressure during the whole day for accurate prognosis.
A study by Penn State researchers found that nearly all Caribbean land-breeding frog species, including coqui frogs, originated from a single ancient species that rafted on a sea voyage from South America. The discovery challenges previous theories of their arrival and reveals the surprising common ancestry of these species.
Researchers at North Carolina State University have found that Phytophthora infestans, the fungus-like pathogen responsible for the 1840s Irish potato famine, originated in the Andes region of South America. The study used gene genealogies to track the migration patterns of different strains of the pathogen, pointing to an Andean origin.
Researchers studying ancient zircon crystals and river sediments discovered the Amazon River once flowed east-to-west, reversing its current direction. The finding dates back to around 1.3-2.1 billion years ago, during the Cretaceous Period.
New research led by University of Oregon's Douglas Kennett sheds light on Rapa, a French Polynesian Island, revealing a late pulse of colonization around A.D. 1200. The settlement date matches Easter Island's and provides insights into population dispersal mechanisms, highlighting the challenges of environmental degradation.
A new species of hoofed mammal, Hemihegetotherium trilobus, has been discovered in Bolivia with distinctive three-lobed lower molar teeth. The animal is believed to have lived around 13 million years ago and was part of the notoungulate group, which dominated South America before its extinction.
Researchers at Arizona State University and Vanderbilt University found that Peruvian trophy heads came from a greater variety of geologic zones than those buried in ancient tombs, suggesting they were victims of warfare or raiding. Meanwhile, stable isotope analysis revealed corn was cultivated in South America earlier than previously...
A massive earthquake off the coast of Sumatra challenged long-held assumptions about quakes and subduction zones. The Great Sumatra-Andaman earthquake surpassed a magnitude 9 threshold, which contradicts theory that such large quakes occur at subduction zones with young, fast-moving crust.