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Sea star wasting disease
Sea star wasting disease or starfish wasting syndrome is a disease of starfish that appears sporadically, causing mass mortality of affected starfish.〔Dawsoni, Solaster. "Sea Star Species Affected by Wasting Syndrome." Pacificrockyintertidal.org Seastarwasting.org (n.d.): n. pag. ''Ecology and Evolutionary Biology''. Web.〕 There are around 40 different species of sea stars that have been affected by this disease. The disease seems to be associated with raised water temperatures. It starts with the emergence of lesions, followed by body fragmentation and death.〔(【引用サイトリンク】title=Sea Star Wasting Syndrome )〕 In 2014 it was shown that the disease is associated with a densovirus now known as the sea star-associated densovirus (SSaDV).
==Symptoms==
Typically the first symptom of starfish wasting disease is white lesions that appear on the surface of the starfish and spread rapidly, followed by decay of tissue surrounding the lesions. Next the animal becomes limp as the water vascular system fails and it is no longer able to maintain its internal hydrostatic balance. The body structure begins to break down, signs of stretching appear between the arms which may twist and fall off, and the animal dies. The arms may continue to crawl around for a while after being shed. Progression of these events can be rapid, leading to death within a few days.〔(【引用サイトリンク】title=Sea Star Wasting Syndrome )〕
A deflated appearance can precede other morphological signs of the disease. All of these symptoms are also associated with ordinary attributes of unhealthy stars and can arise when an individual is stranded too high in the intertidal zone (for example) and simply desiccates. "True" wasting disease will be present in individuals that are found in suitable habitat, often in the midst of other individuals that might also be affected.〔
The final result is a white, mushy blob, which no longer seems to be a sea star. 〔 https://jackiehildering.files.wordpress.com/2013/12/c2a9-2013-jackie-hildering-210130.jpg 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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