木曽川感潮域における汽水性二枚貝による生態系サービスの定量評価

抄録

The purpose of this study is to evaluate ecosystem service by brackish bivalve in the Kiso river tidal reach.. The ecosystem service is provided by water purification with filter feeding behavior of the brackish bivalve (Corbicula japonica). Field observations were performed to clarify the habitat condition of bivalves in each embayment of the Kiso river tidal reach. We built the numerical growth model of Corbicula japonica with these results, and the growth rate by calculation using the growth model conformed with the growth rate which we analyzed the annual ring of bivalves. We estimated the ecosystem service using the growth model. In the result, it was indicated that the ecosystem service due to feeding behavior of the brackish bivalve reduce the annual nitrogen load from river upstream by 10.7 %.