Long-term changes of community in the estuarine ecosystem of the Ohashi River connecting between Lake Shinji and Lake Nakaumi

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Population dynamics of the brackish water bivalves Corbicula japonica and Musculista senhousia were investigated in the Ohashi River, Shimane Prefecture. Monthly samplings were conducted at the selected stations from the upstream (Lake Shinji) to the downstream (Lake Nakaumi). Saline water intruded into the deeper zone of the Ohashi River, which corresponded with distribution and expansion of M. senhousia. Distribution of C. japonicawas expanded towards the downstream at the flood. Density of C. japonica population at the upstream station of the Ohashi River tended to be small in winter and to be large in summer from November 2005 to March 2013.