北米西岸でヒトデが大量死、原因を調査中


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[February 2 AFP] — West Coast, U.S., — the past several months and a cause — while it has been unknown, the sand star is carrying out extensive death.
Biologists have deepened concern noting that a sand star grasps the key to marine ecosystem protection.
It is that ? researchers noticed the extensive death of the sand star in June, last year.
According to Director Jonathan Sleeman (Jonathan Sleeman) of the United States Geological Survey (US Geological Survey, USGS) and a national wild animal protection center (National Wildlife Health Center) It says, “Various kinds to what is bred from the wild thing of sand stars are dead.”
The things with most [ according to the declaration which this center issued in ? December of the same year ] dead numbers of individuals are a ムラサキ sand star (scientific name–isaster ochraceus) and a sunflower sand star (scientific name–ycnopodia helianthoides).
The sunflower sand star is made into the sand star of the world’s largest class, and there is also a thing over 1 meter in width.
? The condition most often looked at by the dead sand star is a white lesion which is possible for an arm.
Infection is regarded as the cause, a pathological change will spread quickly, an arm will be cut, and it will die in several of the days.
Puget Sound (Puget Sound) and the California (California) state coast of a ? U.S. Washington (Washington) state, On the サリッシュ seashore (Salish Sea) of the Canada British Columbia (British Columbia) state, it is expected that all the individuals inhabiting the whole place have died, and it is said that the case fatality rate after infection reaches to about 95%.
The researchers who have investigated the ecosystem of these every place over tens of years in the past [ ? ] have not specified the cause of infection yet, either.
The ecology and the evolutionary biology division manager of ? rice University of California at Santa Cruz (University of California, Santa Cruz), Professor Pete Raimondi (Pete Raimondi) is explaining that it is disease germs which researchers consider as a cause of the extensive death of such a sand star now, such as a parasite, a virus and bacteria, to coverage of AFP.
These are infected with a sand star and it says whether to have exerted danger on the immunological system in a certain form.
The sand star with which ? immunological system was troubled is infected with bacteria further easily, and “secondary infection” happens.
It is expected to be the main causes which have caused the present situation.
(c)AFP/Jean-LouisSANTINI




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