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Tag: "continent" at biology news

Caribbean frogs started with a single, ancient voyage on a raft from South America

...e relatives rarely dominate the fauna of an entire continent or major geographic region," explained Penn State'...reely over millions of years, the fauna of any one continent is usually a composite of many types of animals." Yellow and black spotted frog from caves in Hai...

Male circumcision overstated as prevention tool against AIDS

...been an adequate explanation as to why Africa as a continent is experiencing an AIDS epidemic far in excess of any other region of the world with some African countries’ prevalence rates exceeding 25% of the adult population and tens of millions dying from the disease on the continent. Talbott’s new study sugg...

Antarctic icebergs -- Hotspots of ocean life

...uthern Atlantic Ocean that cuts into the Antarctic continent southeast of Cape Horn. The icebergs in the study were up to a dozen miles long and more than 120 feet high, with one extending nearly 1,000 feet into the depths. Despite the risks of getting close to these mountains of ice – which can shed huge ...

Climate change was the cause of Neanderthal extinction in the Iberian Peninsula

...al extinction and the colonisation of the European continent by Homo Sapiens. During the last Ice Age, the Iberian Peninsula was a refuge for Neanderthals, who had survived in local pockets during previous Ice Ages, bouncing back to Europe when weather conditions improved. Climate reconstructions Th...

Invasion of the island bats

...tive edge and so they hardly ever re-colonized the continent from which they originated. These views suffered a severe blow recently when evolutionary studies of birds of the South Pacific and Caribbean lizards uncovered at least three separate cases of island-to-continent colonization. Then again, these f...

UTSA researchers examine effects of global warming on Antarctic

...iles of extensive sea ice cover that surrounds the continent annually. "We now know what the sea ice really looks like as far as its thickness and concentration and now we can compare the data collected to what we see in satellite imagery," said Xie. During the journey, Xie and Cicek made visual observa...

Africa's first large-scale HIV vaccine study launches

...to evaluate a candidate HIV vaccine on the African continent was announced today by study collaborators in the United States and South Africa. The trial will involve up to 3,000 participants at five sites throughout South Africa and is expected to continue for four years. The sites are part of the HIV Vaccine...

Antarctic warming to reduce animals at base of ecosystem, shift some penguin populations southward

... great impacts on both the glacial dynamics of the continent but also on the fragile marine and terrestrial ecosystems that have been thriving there in the past." ...

Microfossils unravel climate history of tropical Africa

...ifficult than for the oceans, because soils on the continent do not form a continuous archive but are often eroded. The researchers developed an entirely new proxy for the annual mean air temperature on land, based on molecules from the cell membrane of soil inhabiting bacteria. They analysed eroded soil mater...

Volcanic eruptions, ancient global warming linked

...ther 5 million years for the mantle to weaken, the continent to thin and the molten material to rise to the surface," Duncan said. "It was like lifting a lid. The plate came apart and gave birth to the North Atlantic Ocean." The link from the volcanism to the warming period came through correlations with th...

HIV dementia alarmingly high in Africa

... In the first study of HIV dementia on the African continent using rigorous neurological and neuropsychological tests, 31 percent of a small but presumably representative group of HIV-positive patients in Uganda were found to have HIV dementia, according to Ned Sacktor, M.D., a Johns Hopkins neurologist and se...

Unique gene regulation gives chilly bugs survival advantage at bottom of the world

... largest species that has adapted to living on the continent year-round," said Denlinger, adding that other native animals, such as seals and penguins, spend much of their time in the water. The midge is also the only insect known to inhabit Antarctica. He and his colleagues collected adult and larval midges...

Record ozone loss during 2006 over South Pole

...e winter, the atmospheric mass above the Antarctic continent is kept cut off from exchanges with mid-latitude air by prevailing winds known as the polar vortex. This leads to very low temperatures, and in the cold and continuous darkness of this season, polar stratospheric clouds are formed that contain chlori...

End of deforestation in view? Experts advance new way to size up global forest resources

...h Korea and Viet Nam. Taken as a whole, the Asian continent recently experienced forest transition, having lost 792,000 hectares of forest between 1990 and 2000 but gaining just over 1 million hectares between 2000 and 2005. The authors foresee still more nations achieving forest transitions within three d...

Antarctic Treaty Meeting moves to protect frozen continent from non-native species

... non-native species establishing themselves on the continent itself, the meeting also backed a series of recommendations made by New Zealand. These include development of a code of conduct for land-based activities - a set of minimum standards that all visitors, including tourists and scientists, would have to...

Seal rookeries could provide a reliable food source for endangered California condors, study finds

...rica. Thousands are believed to have inhabited the continent during the last Ice Age, their range extending from British Columbia to Baja California and east into Texas, Florida and New York. Fewer than 300 are alive today, the majority recently bred and hatched in zoos as part of the U.S. Fish and Wildlife ...

Study shows big game hunters, not climate change, killed off sloths

...t arrival of humans or the warm-up of the American continent at the end of the last Ice Age was responsible for...at about the same time on both the islands and the continent since climate change is a global event," Steadman said. Gary Haynes, anthropology professor at the ...

Sensor web simulation investigates technique to improve prediction of pollution across the globe

...ransported from city to city, region to region and continent to continent is an important step toward improving the complex mathematical computer models used to forecast air ...

York scientists warn of dramatic impact of climate change on Africa

...ikely impact of future climate fluctuations on the continent by modelling the responses of more than 5000 plant species to predicted climate changes. Dr Jon Lovett, who led the research, said: "The results were extraordinary ?plants migrate out of the Congo rainforests and there is a massive intensification o...

Proposal would allow wild animals to roam North America

...we are investing all of our megafauna hopes on one continent -- Africa." Greene and a number of other highly eminent ecologists and conservationists have authored a paper, published in the latest issue of Nature (Vol. 436, No. 7053), advocating the establishment of vast ecological history parks with large mam...

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