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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 Halipegus eccentricus ： ウィキペディア英語版 Halipegus eccentricus ''Halipegus eccentricus'' is a monoecious, digenea parasitic trematode commonly found in true frogs in North America. It was first described in 1939 . ''H. eccentricus'' is mainly found in the Eustachian tubes of a variety of frog species, its definitive host, although its life cycle involves other hosts, as is common for trematodes. Earlier research  proposed that its life cycle involved two other species of hosts (ostracods and snails); however, subsequent research has revealed that the nymph form of the damselfly is also involved . ==Population Dynamics and Distribution== There is a positive correlation between numbers of ''H. eccentricus'' and frog size and age. The maximum infrapopulation density that a single frog can support is twelve, although most infected frogs have only five or six worms. Seasonal patterns of prevalence of the parasite in one of its intermediate hosts, ''Physa gyrina'', have been observed to peak in May through July and to decline in autumn, which coincides with the decline of leaf litter.〔Long-term Changes in Parasite Population and Community Structure: A Case History Gerald W. Esch, Eric J. Wetzel, Derek A. Zelmer, Anna M. Schotthoefer American Midland Naturalist Vol. 137, No. 2 (Apr., 1997), pp. 369-387 Published by: The University of Notre Dame Stable URL: http://www.jstor.org/stable/2426856〕 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「Halipegus eccentricus」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.