富栄養海域福山港の底生動物相

概要

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The port of Fukuyama is located in the Bingo-nada, the central area of the Seto Inland Sea, and is an area of semienclosed coastal waters. In the interior part of the port, dissolved oxygen (DO) in the bottom layer decreased to nothing in June. The low DO condition continued until October, and the period of low DO coincided with a period of high water temperature. This study aimed to clarify the characteristics of benthic fauna in the port of Fukuyama in relation with low DO conditions. In 1998–1999, we carried out an investigation to clarify the number of species, density, biomass, and diversity of macrobenthos inhabiting the port. The macrobenthic fauna was composed of 111 species with 50% of polycheates, 28% of crustaceans and 14% of bivalves. A small-size polychaete community inhabited the inner part of the port, polycheate and bivalve communities were distributed in the mouth of the port, and an intermediate community composed of both communities lived in the central part of the port. These habitat segregations of communities of macrobenthos reflected the conditions of DO in the bottom layer and sediment.