Tag: "extinction" at biology news

Duke Ecologist Says Logging Is Creating 'Mahogany Deserts'

...which although not necessarily now threatened with extinction maybecome so unless trade in specimens of such species is subject to strictregulation..." Such a listing would not restrict trade, but would require that mahoganiesbe monitored and that producing nations define sustainable harvesting levelsand issue...

Behemoth Animals May Follow Same Extinction Patterns

... "If we look at the last five million years before extinction for bothdinosaurs and proboscideans, we find a sur...ver. "Most people believe that we understand the extinction of the dinosaursnow that we have proof of a large meteor event at the time of their finaldemise," sa...

An Equal Opportunity Extinction? Cincinnati Geologists Find Global Impact from Permian Die

...gical Society ofAmerica that the Late Permian mass extinction was global in itsextent and hit all marine areas w...ronments such as reefs were hit hardestduring mass extinction events. Cooler areas of the globe andpolar regions appeared to be spared the most dramatic effects o...

Impact of Meteorites, Drop in Sea Level Caused Mass Extinctions 65 Million Years Ago

The scientific dispute over what caused the extinction of 70 percent of all species worldwide 65 million ...dence supporting the controversial theory that the extinction of dinosaurs and many other species was caused by the impact of a huge meteorite that crashed to Ear...

New Evidence For Corn's Ancestry Could Lead To Insect And Drought Resistant Crops

...red Zea diploperennis growing on thethreshold of extinction in the mountains of Jalisco, Mexico. Rescued fromthe wilds, lines of that perennial teosinte are now being maintained forresearch purposes. Mangelsdorf's new hypothesis, which he held until his death, said annualteosinte resulted from a cross betwee...

First-Of-A-Kind Study By University Of Georgia Ecologist Estimates Role Of Natural Forces On Insect Populations

... rise and fall, or it could, in fact, bepart of an extinction curve....

Handfish Steps Back From Brink Of Extinction

...ral Endangered Species Protection Act, may escape extinction as a result of successful breeding trials and research into its biology. "We believe we now have the techniques to proceed with developing a larger-scale breeding program for this and other related handfish species if required," said Barry Bruc...

American Museum Of Natural History Researchers Announce Discovery Of Oldest Known Fossil Ants - 92-Million-Year-Old Fossils Found In New Jersey Amber

...t the major lineages of ants arosebefore the great extinction at the end of the Cretaceous, 65 million yearsago. A reasonable estimate would place the origin of ants in the LowerCretaceous at about 130 million years ago. Ant fossils from the Cretaceous Period are extremely rare, but those fromthe subsequent Te...

New Dinosaur Finds In Antarctica Paint Fuller Picture Of Past Ecosystem

... before the asteroid impact that contributedto the extinction of the dinosaurs). The team that found the fossils is headed by Sergio Marenssi ofthe Instituto Antartico Argentino and Judd Case of St. Mary's College, California. "This is the first duck-billed dinosaur to be found outside the Americas," said Mik...

Recovery From Mass Extinction Is Unexpectedly Diverse

...one geographical region toanother, even though the extinction intensities and patterns are more or lessthe same ... explanation does not account for thesimilarity in extinction intensities found in all four regions. Studies of therecovery rates in northern South America could ...

Crater Chain On Two Continents Points To Impact From Fragmented Comet: 214Million Year-Old Event Corresponds With Mass Extinction

... ago. The impacts may have contributed to a mass extinction that occurred at the endof the Triassic period...lion years ago, killing thedinosaurs. The Triassic extinction was equivalent in magnitude to the Cretacious/Tertiary(K/T) extinction: about 80% of the species the...

Carnegie Mellon Researchers Develop Nation's First Robotic Tour Guide For The Dinosaur Hall At Pittsburgh's Carnegie Museum Of Natural History

...arine reptiles. 'Sage' alsocan discuss theories on extinction and why some dinosaurs are so large. "This robot is unique in its ability to function in a public environmentwithout any human guidance," said Illah R. Nourbakhsh, assistant professor ofrobotics at Carnegie Mellon and lead engineer on the 'S...

Genetic Study Reveals Sumatran Tigers Are A Distinct Species From All Mainland Tigers

... While all tigers are under severe threat of extinction in the wild,Sumatran tigers are currently underrepresented in the captive breeding programsof the world's zoos. The discovery that they represent a unique speciesindicates an urgent need to increase conservation management both on theIndonesian isla...

Environmental Testimony: Taiwan Mega-Complex Threatens Endangered Spoonbills And Efforts To Cut Greenhouse Gases, UD Prof Says

... of Taiwan threatensthe black-faced spoonbill with extinction and will increase greenhouse gasemissions, according to a University of Delaware professor who recentlytestified before a Taiwanese legislative committee. John Byrne, director of UD's Center for Energy and Environmental Policy, toldthe committee that...

Wildlife Dying At The Doorsteps Of World's National Parks, Study Says

...d under the theory thatpopulations may be drive to extinction by random fluctuations in demography andloss of genetic diversity. But the authors warn that conservation measures thatfocus only on maintaining or bolstering populations within protected areas areunlikely to prevent extinctions....

Study 'Gone With The Wind' Provides Stellar Ecological Example

...ng capability. A third is that the risk of extinction is related to population sizewhen disturbance is moderate but not when it is catastrophic. In relation tothis, the biologists uncovered perhaps the first concrete evidence of howhurricanes wreak devastation on low-lying island organisms. It's not t...

A 300-Million-Year Old Twosome: The Cycad And Its Pollinator

...d of the 11 living genera, mostare on the verge of extinction because of loss of habitat, slow growth, andinfrequent reproduction. In a joint project with Fairchild Tropical Garden, Dr.Dennis Wm. Stevenson, Director of the Harding & Lieberman Laboratories at TheNew York Botanical Garden and the world's leading...

Duke Studies Show That Environmental Effects Of Dams Extend To Insect Life

...he fragments, generally leading to alot of species extinction at some point," said Shahabuddin, who is one ofTerborgh's doctoral students. "I decided to look at butterflies, because veryfew people look at such invertebrates in forest fragments," she added in aninterview. In 1995, Shahabuddin began to ev...

University Of Cincinnati Geologists Analyzes Evolutionary Impact Of Mass Extinctions

...esame profound effect on a local biota that a mass extinction has on a globalbiota." As an example of an abrupt regional change, Miller discusses the diversificationof a group oforganisms known as "biological bulldozers," which dig into deposited sedimentsto find food. Thegeologic record includes cases where ...

USGS Finds Sea Otters At Risk From Killer Whales In A Changing Ocean

...that have occurred, Estes said. Reduced nearly to extinction by the early 20th century, sea otter populationsgrew again under the protection of the International Fur Seal Treaty, reachingnear maximum numbers in some areas by the 1970s. When a recent abrupt andunexpected decline in sea otter numbers occurred ov...

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