都市近郊における土地利用の異なる谷津内の河川に生息する底生動物相の違い

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In this study, the different land uses in the valley bottom and the basin of Yatsu were investigated for their influences on benthic fauna, which grows in the river in Yatsu. The valley bottom of Yatsu has a natural type land use and is an over-marsh and hydrophyte communities, and the rate of wooded area in the basin is high. The semi-natural land use type of Yatsu at the valley bottom is marshland, however, the rate of residential and farmland areas in the basin are considerably higher than that of wooded area. In the natural type, the ratio of the number of species and individuals with a low water pollution series was high, such as Perlodidae sp., Simulium sp. etc, in case of the semi-natural type, the ratio of the number of species and individuals with a high water pollution series was high, such as Rhantus pulverosus, Gerris paludum japonicus, etc. The similarity index between the investigation points was different in a natural type and semi-natural type. As for the water quality value of the natural type, DO was high, the water temperature, TP, TN, and Cl were low in comparison with those in the semi-natural type. We considered that the natural type may have a high water-holding capacity and water purification ability due to the presence of hygrophytes, and that an abundant supply of spring water into the river may enhance the water quality, the species of low water pollution series has increased. In the correlation coefficient between the individuals of the main benthos species and the water quality, Asellus hilgendorfi was 0.967 (P=0.007) with TP, Chironomidae sp. was 0.964 (P=0.008) with Cl and was 0.913 (P=0.03) with EC. We considered that water pollution has progressed, and species of a high water pollution series has increased as the residential and the farmland development in the basin has advanced.

都市近郊における土地利用の異なる谷津内の河川に生息する底生動物相の違い

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