奄美大島大浜海岸に打ち上げられた貝類遺骸群集

抄録

Molluscs washed up on Ohama Beach of Amami-Oshima Island are collected from the beach at ebb tide inlate January, from 2014 to 2018. Molluscan death assemblages are composed of 72 species of shelled molluscs, 17 bivalves and 55 gastropods. They are also dominated by rocky-shore species and contains many coral reef ones. Faunal composition of each death assemblage almost not changed during five years based on habitat substrate and biogeographic distribution. Molluscan death assemblages on Ohama Beach probably belong to time-averaged assemblage from the view point of taphonomy. Molluscan death assemblages are used for valuable paleoenvironmental indicators in tropical-subtropical area in the case of time-averaged assemblage will preserve in so-called beachrock on nearshore area in future.