Community structure and diversity of macrozoobenthos at Bohai Sea off Shandong

The community of macrozoobenthos was investigated at Bohai Sea off Shandong in August 2017 and 2018. The species composition, abundance, biomass, community structure and biodiversity were analyzed. A total of 104 macrozoobenthos species were separated, which mainly composed of 46 species of polychaetes, 30 species of crustaceans, 15 species of mollusks and 5 species of echinoderms. The dominant species were Moerella iribescens, Sternaspis sculata and Nephtys oligobranchia, which were small sized macrozoobenthos. The average abundance of macrozoobenthos was 91 ind/m² and the biomass was 7.61 g/m² in 2017, which was 263 ind/m² and 19.98 g/m² in 2018. The average Shannon-Wiener index was 2.52 in 2017, which was 2.67 in 2018. The distribution of macrozoobenthos can be divided into two regions. One is mainly included the Binzhou-north of the Yellow River Estuary of Dongying offshore, and the southern offshore area of Longkou Port, which was disturbed by anthropogenic activities, There are few benthic species in this region, and the distribution has local randomness; the other part is the area far off the coast, which has the characteristics of rich species and higher biodiversity, dominated by Sternaspis sculata, Moerella iribescens and Nephtys oligobranchia. The ABC curve showed that the macrozoobenthos community structure at most stations were stable, just few disturbed stations were located near the coast.