Departmental Bulletin Paper 天竜川における底生無脊椎動物の生息場履歴に関する基礎的特性の把握
Basic understanding of shifting habitat history on macro-invertebrates in the Tenryu River

兵藤, 誠  ,  竹門, 康弘  ,  角, 哲也  ,  鳥居, 高明  ,  小林, 草平

Description
We conducted a research to obtain basic understanding of shifting habitat history on macro-invertebrates in the Tenryu river. Firstly, we collected photo data taken every hour by interval-recording cameras, which had been installed at the transmission tower, to analyze shifting habitat effects and disturbance regimes by floods. Secondly, we selected several habitat units found in the photo data frames; sampled macro-invertebrates every two months; and analyzed their spatial and temporal distribution patterns. Results showed that habitat units and their compositions changed at a macro habitat scale by middle floods (2-year RP) and river configuration changed at a reach scale by larger floods (5-year RP). Analyses on selected 50 macro-invertebrates showed most species were likely to migrate intermittently from principal habitats they lived to another habitat type after the middle flood. This indicated various habitat types with different ages function to sustain biodiversity during and after the disturbances.
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