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発表 Effects of habitat fragmentation and connectivity on fish assemblages in dendritic river networks

作成年度 2013 年度
論文名 Effects of habitat fragmentation and connectivity on fish assemblages in dendritic river networks
論文名(和訳)
論文副題
発表会 日本生態学会第61回大会
誌名 日本生態学会
巻・号・回 61
発表年月日 2014/02/01
所属研究室/機関名 著者名(英名)
独立行政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森照貴
抄録
Habitat fragmentation has been implicated as one of the major cause of diversity decline in dendritic ecological networks such as river ecosystems. Previous studies have shown that river size and local environmental quality regulate fish assemblages in fragmented habitats. Fish assemblages in main steam are influenced by not only habitat size and local environmental conditions but also distance to and characteristics of nearest tributaries, but few studies have considered river network structure to evaluate effects of habitat fragmentation on the assemblages. Thus, I examined effects of fragmentation by dams on river fish assemblages by focusing on ecosystem size, quality, and river networks structure in the Kiso, Nagara and Ibi River, central Japan. Fragmented ecosystem size and water quality were important factors for explaining fish assemblages, and these effects did not vary among species. River network structure, such as distance to nearest tributaries, influenced fish assemblages, but the effects were dependent on species. Pelagic fishes were more influenced by the network structure than benthic and sedentary ones. Our findings suggest that connectivity and complexity of river networks should be considered to understand metacommunity structure in fish assemblages.
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