Nov. 5, 2008 -- Disease can wipe out an entire species, reveals a new study on rats native to Australia's Christmas Island, which fell prey to "hyperdisease conditions" caused by a pathogen that led to the rodents' extinction. The study, published in the latest issue of the journal PLoS One, presents the first evidence for extinction of an animal entirely because of disease. The researchers say it's possible for any animal species, including humans, to die a out in a similar fashion, although a complete eradication of Homo sapiens would be unlikely. "I can certainly imagine local population or even citywide 'extinction,' or population crashes due to introduced pathogens under a condition where you have a pathogen that can spread like the flu and has the pathogenicity of the 1918 flu or Ebola viruses," co-author Alex Greenwood, assistant professor of biological sciences at Old Dominion University in Norfolk, Va., told Discovery News. Related Content: The Animals of Planet Earth Jennifer Viegas' Blog: Born Animal Howstuffworks.com: Will We Soon Be Extinct? The 1918 flu killed millions of people, while Ebola outbreaks have helped to push gorillas close to extinction. For the Christmas Island study, Greenwood and his colleagues collected DNA samples from the island's now-extinct native rats, Rattus macleari and R. nativitatis, from museum-housed remains dating to both before and after the extinction event, which occurred between 1899 and 1908. Co-author Ross MacPhee, a curator of vertebrate zoology at the American Museum of Natural History in New York, N.Y., explained that Charles Andrews of the British Museum documented at the time that black rats were first brought to the island via the S.S. Hindustan in 1899. The ship-jumping black rats then carried a protozoan known as Trypanosoma lewisi. A related organism causes sleeping sickness in humans. Get More NewsMouse Cloned From Long-Frozen CellResearchers create a mouse from a long-frozen cell. Will the mammoth be next?'Bubble' Could Protect AstronautsScientists say a "bubble" around a Mars-bound spaceship could protect astronauts.Big Reduction of Snowmobiles in Yellowstone ProposedA new plan would cut snowmobile use by 40 percent in Yellowstone.Microbes: Fuel of the Future?A reddish South American microbe is literally breathing fuel, say scientists.DNA Links Remains to Steve FossetDNA tests on two bones found in California confirm they are those of Steve Fossett.Women Carry More Bacteria Than MenSome bacteria prefer women, suggests a new study. But why?Ancient 'Water Monster' Facing ExtinctionA foot-long salamander that was a key part of Aztec legend is threatened by extinction.Grand Canyon's Youth ConfirmedThe Grand Canyon is millions of years younger than previously thought, argue geologists.My Take: E-Voting Not User FriendlyOpinion: Electronic voting machines don't always capture the intent of voters.SLIDE SHOW: Landscapes of TerrorWhat makes a place feel scary? There are scientific explanations.At 40, Brain and Body SlowThe part of the brain in charge of motion starts a gradual slide in middle age.Spiders, Scorpions Among World's Oldest CreaturesMany creepy crawlies have been on Earth much longer than previously believed.Blood-Sucking Vampire Bats Sing DuetsWhite-winged vampire bats "harmonize" with separated roost mates. |
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