关键词: 巢湖, 河蚬, 环棱螺, 富营养化

Abstract: Macrobenthic faunas were sampled at nine sites in the intertidal zones of Hengsha and Changxing islands in October (autumn) 2006 and April (spring) 2007 to study the community characteristics and spatiotemporal patterns of macrozoobenthos in the study area. A total of 13 macrozoobenthos species were identified, belonging to Crustacea (2 species), Mollusca (3 species), Polychaeta (3 species), and others (5 species). The density and biomass of the macrozoobenthos had less difference between spring and autumn, but had significant differences between Hengsha Island and Changxing Island (P<005), being higher at the sites of Hengsha Island. In autumn 2006, the density of macrozoobenthos was significantly higher in mid-intertidal zone than in high- and low-intertidal zones (P<005); while in spring 2007, this density was lower in low-intertidal zone than in the other two zones (P<005). However, the biomass of macrozoobenthos had no significant differences among the three intertidal zones both in autumn 2006 and in spring 2007. There were no significant differences in the biomass between seasons except for low-intertidal zone (P<0.05). The diversity and evenness indices of the macrozoobenthos had no significant differences between seasons and among sampling sites. Bray-Cutis and MDS analysis also showed that there were no significant differences in the macrozoobenthic communities among the sampling sites.

Key words: Chaohu Lake, Corbicula fluminea, Bellamya sp, Eutrophication