豊川河口域に生息する貝類の分布特性と物理環境特性との関係について

抄録

To clarify the relationships between physical characteristics and benthic organisms in estuary ecosystems, we surveyed geomorphology, water chemistry, and abundance and stable isotopes of benthic invertebrates in the Toyo River estuary with primary focusing on bivalves that are known to be sensitive to upstream river environment.

Abundance of bivalves was high at shallow places where substrate and dissolved oxygen were in preferable conditions. Ruditapes philippinarum was distributed in highly saline and sandy places. Corbicula japonica was abundant in places where mean salinity ranges from 1 to 25‰ and bottom sediments consist of gravels.

These habitat suitability information of native key species should be used in appropriate river environment management.