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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Peniagone vitrea ： ウィキペディア英語版 Peniagone vitrea ''Peniagone vitrea'' is a species of deep-sea swimming sea cucumber in the family Elpidiidae. It is a detritivore and is found in the northern Pacific Ocean at abyssal depths. It was first described by the Swedish zoologist Hjalmar Théel in 1879, being one of the many deep sea animals discovered during the Challenger expedition of 1872–1876.〔 ==Ecology== ''Peniagone vitrea'' is one of a number of echinoderm species that show great variations in population density. Researchers in one study found that, over a sixteen year period, two deep sea holothurians, ''Elpidia minutissima'' and ''Peniagone vitrea'', underwent a decline in density of the order of one to two magnitudes. It has been hypothesized that two factors that increase the likelihood of large swings in population are broadcast spawning and the possession of planktotrophic larvae. These factors provide a positive feedback loop so that once populations decline, recovery is very slow. When individual organisms are further apart, broadcast spawning is less likely to result in fertilisation and this means fewer larvae available for recruitment. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Peniagone vitrea」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.