Community structure and biodiversity characteristics of macrobenthos in the middle of Xiangshan Bay

Abstract:

In April, July, September and December, 2012, the investigations of macrobenthos in the Xiangshan Bay were carried out, and the macrobenthic dominant species, species diversity and community species composition were analyzed using the dominant species index (Y), Shannon-Weaver diversity index (H'), Margalef richness index (d) and Pielou evenness index (J'). We adopted the Bray-Curtis similarity matrix and MDS analysis of Xiangshan Bay macrobenthos community structure, pollution disturbance conditions analyzed by the ABC Curve method. The investigation showed that Nassarius semiplicatus became the dominant species and were four seasons dominant groups. Shannon-Weaver diversity index was broadly consistent with the distribution of Margalef abundance index horizontal distribution, and Pielou index changed compared to the Margalef richness and Shannon-Weaver diversity index changed little, indicating the various kinds of individuals in the community had little differences, evenly distributed between stations. Macrobenthic community was distributed mainly in the investigation area near the north coastal and central had higher similarities, and near the south coastal stations similarity wiht the same, marine environment different with the habitats formed, and then distributed in the community structure formed of two different groups. The results of ABC Curve method indicated that in April, July macrobenthic community was not polluted and September and December had slight polluted disturbance. The main factors were connected with thermal discharge, industrial waste emissions, natural coastline and reduced wetlands aera.