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Tag: "continents" at biology news

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

...ted the research. "Because land connections among continents have allowed land-dwelling animals to disperse freely 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 Haiti. Eleutherodactylus counouspeus . ...

Potent possibilities for parasite attack

... Around 350 million people in 88 countries on four continents are at risk of Leishmaniasis and its incidence has risen sharply over the past ten years. It is transmitted by the bite of various species of sandfly: wild and domesticated animals - as well as humans - act as a reservoir for the disease....

The kapok connection -- Study explains rainforest similarities

...South American rainforests are similar because the continents were connected 96 million years ago. Research by ...other rainforest--trees colonized Africa after the continents split when the trees' seeds traveled across the ocean. The findings, funded by the National Scien...

Want to save polar bears? Follow the ice

...ing 18 populations of polar bears occurring on two continents and one sub-continent stand the best chance of surviving as the polar cap shrinks in size. To that end, the project will utilize remote sensing satellite imagery on sea ice extent and concentration since 1978 to form a picture of polar bear habitat h...

Invasion of the island bats

...s biological destinations where species from large continents arrive and, over time, evolve into new species in ...es than the continent, it seemed only logical that continents were rich sources from which islands drew only a small sample. Once isolated and with fewer species ...

'Ancestral eve' was mother of all tooth decay

... gathered over 600 samples of the bacterium on six continents over the past two decades. His final analysis focused on over 60 strains of S. mutans collected from Chinese and Japanese; Africans; African-Americans and Hispanics in the United States; Caucasians in the United States, Sweden, and Australia; and Am...

Evolution of Old World fruit flies on three continents mirrors climate change

...ago. "This is a clear signal on three different continents that climate change is occurring, and that genetic change is going along with it," said Raymond Huey, a University of Washington biology professor who is co-author of a paper describing the findings, published Aug. 31 in Science Express, the online e...

Too mellow for our predatory world

...ation why tame animals have become extinct in many continents but also provide fresh arguments for conservation biologists. For in the meantime, the government of Ecuador has opened the UNESCO world heritage site of the Galápagos Islands to the cruise ship market. With growing mass tourism, the situation is ...

Tropical forest CO2 emissions tied to nutrient increases

...n up to 40 percent of the carbon stored on Earth's continents and account for at least one-third of the annual exchange of CO2 between the biosphere and the atmosphere, said Cleveland. Earth's soils are believed to store several times more carbon than all of the planet's vegetation. "This is the first time any...

It's all in the genes

...ir color. But a large group of scientists from two continents has found that the genes of one organism not only control the characteristics of that individual but also dictate the behavior of thousands of other organisms in a community. They say these genes, in fact, influence the evolution of an entire ecosy...

Convergent evolution of molecules in electric fish

Having a set of extra genes gave fish on separate continents the ability to evolve electric organs, report researchers from The University of Texas at Austin. Dr. Harold Zakon and colleagues, in a paper recently published in Proceedings of the National Academy of Sciences, show that African and South American...

Ocean virus identified in human blood samples

...is that has killed millions of rabbits across four continents in the past 20 years. In more than 30 years of research, part of what has been found to be unusual about caliciviruses is that they can cause multiple diseases and affect a broad range of marine and terrestrial animal species ?a single Vesivirus ser...

Wild birds help to create human flu vaccine

...ds and the viral storms they carry over oceans and continents and share that data with the world," said Senator Joe Lieberman (D-CT), who recently introduced the Global Network for Avian Influenza Surveillance Act and has been working with congressional leaders to address this gap in US surveillance efforts. ...

Newly discovered birdlike dinosaur is oldest raptor ever found in South America

...uggests that dromaeosaurs on northern and southern continents took different evolutionary routes after the landm... exhibition that opens March 10, 2006. Drifting continents About 200 million years ago, all of the Earth's land was amassed in one supercontinent called Pang...

Beauty queens urge girls not to sacrifice their bones

Seven beauty queens from four continents today appealed to girls and young women to realize that modern ideas of "beauty" can damage their bones and lead to osteoporosis later in life. The women, from Australia, Austria, Panama, Thailand, Turkey and Venezuela, were speaking at "IOF Beautie...

Millennium Ecosystem Assessment: Many of 2 billion dryland dwellers at risk as land degrades

...aguing many areas menace the health of people even continents away, international experts warn in a new report. Thick storms rising out of the Gobi Desert affect much of China, Korea and Japan and even reduce air quality over North America, according to Ecosystems and Human Well-Being: Desertification Synthesi...

Leprosy genome tells story of human migrations, French researchers report in Science

... pathogen evolved and how it was spread across the continents by human migrations. The research, led by scientis...s previously thought, and then spread to the other continents in part through European colonialism and later the slave trade. One of the oldest known human disea...

Family trees of ancient bacteria reveal evolutionary moves

... got their start on Earth in freshwater systems on continents and gradually evolved to exist in brackish water environments, then higher salt ones, marine and hyper saline (salt crust) environments. Cyanobacteria are organisms that gave rise to chloroplasts, the oxygen factory in plant cells. A half billion ye...

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