寿都の岩礁潮間帯における底生動物の群集構造について

概要

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In order to know the effect of oceanogeographic conditions on benthic assemblages on the intertidal rocky shores, we investigated the distribution of benthic invertebrates in Suttsu Bay of western Hokkaido, having the different regimes of the Tsushima current. The benthic assemblages comprised a total of 42 taxa and 31038 individuals. Taxon richness and diversity (Simpson' s index of diversity) of assemblages varied among three sampling sites in Suttsu Bay. In comparison of environmental factors (water depth, water temperature, current velocity, PO_4, SiO_4, COD, seaweed and algal biomass), SiO_4 and COD showed the highest level in the most inner sampling site in this Bay. However, the causal relationships between benthic assemblages and environmental factors were not clear. Ourt results suggested that the impact of the Tsushima current on the rocky benthic assemblages might change depending on the geographical positions in Suttsu Bay.