<報文>山地河川流域の開発に伴う河川底生動物相の影響評価
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概要
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In order to evaluate the river condition, Aquatic macroinvertebrates of the Ayugawa River were investigated as compared with that of the Sanbagawa River in Gunma Prefecture, Central Japan. Eight golf links were created in the basin of the Ayugawa River, however, not in that of the Sanbagawa River. The aquatic macroinvertebrates were collected quantitatively by Suber sampler (38 mesh) on each site. The adults of aquatic insects were collected by NOZAWA type light trap (Fig. 2)at the lower sites of each river (a.12, S.4). The river condition of the Ayugawa River on the most sites (excepting a.1, a.2, a.3)was bad with poor fauna, small total biomass or low value of SHANNON's diversity index. Especially, the tributaries(a.5, a.8, a.9, a.11) of the Ayugawa River showed bad condition, while the condition of the Sanbagawa River (s.1, S.2, S.3, S.4) was good with rich fauna, large total biomass and high value of SHANNON's diversity index. Furthermore, as regards the number of individuals collected by light trap, aquatic insect faunas of the Sanbagawa River (s.4) were also richer than those of the Ayugawa River (a.12). From the facts described above, it may be concluded that aquatic life of the Ayugawa River excepting the upper sites is remarkably damaged. The Nozawa type light trap resulted in effective collection of many species and many individuals. And it is easy to identify the species name of aquatic insects from the adults. This light trap is founded to be suitable to environmental assessment.
- 横浜国立大学の論文
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- 山地河川流域の開発に伴う河川底生動物相の影響評価