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論文投稿 Density-dependent effects of non-native brown trout Salmo trutta on the species-area relationship in stream fish assemblages

作成年度 2016 年度
論文名 Density-dependent effects of non-native brown trout Salmo trutta on the species-area relationship in stream fish assemblages
論文名(和訳)
論文副題
発表会
誌名 Journal of Fish Biology
巻・号・回 90 1
発表年月日 2016/10/24
所属研究室/機関名 著者名(英名)
水産総合研究センター北海道区水産研究所Koh Hasegawa
国立研究開発法人土木研究所水環境研究グループ自然共生研究センターTerutaka Mori
北海道大学大学院環境科学院Chitose Yamazaki
抄録
The spatial scale and density-dependent effects of non-native brown trout Salmo trutta on species richness of fish assemblages were examined at 48 study sites in Mamachi Stream, a tributary of Chitose River, Hokkaido, Japan. The density of age ?1?year S. trutta was high in the upstream side of the main stem of Mamachi Stream. Fish species richness increased with increasing area of study sites (habitat size), but the increasing magnitude of the species richness with area decreased with increasing age of ?1?year S. trutta density. The relationships between age ?1?year S. trutta, however, and presence?absence of each species seemed to be different among species. Species richness was also determined by location and physical environmental variables, i.e. it was high on the downstream side and in structurally complex environments.
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