RELATIONSHIP BETWEEN MACROBENTHOS AND PHYSICAL HABITAT CHARACTERISTICS IN TIDAL FLATS AT TWO RIVER MOUTHS IN SHIKOKU ISLAND

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  • 河口干潟潮間帯の物理的な底質環境と底生生物群集との関係

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Quantitative quadrat sampling of macrobenthos was carried out at two tidal flat estuaries in Tokushima Prefecture to study the relationship between physical characteristics of sediments and biodiversity. Conclusions are as follows: 1) Physical characteristics of sediment were classified into 7 groups by cluster analysis in relation to particle size composition of sediment and difference in elevation. 2) There are relationships among plant communities, formation process of tidal flat and stability of the topography. Plant communities determine physical characteristics of sediments. 3) Those groups were also characterized with some specific macrobenthos species. The diversities of sediment characteristics led to increase the number of species. The result suggested that the number of species has a positive correlation to the number of sediment groups.

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