Community structure of macrobenthos in coastal water off yantai, east china
01 Jan 2013-
TL;DR: In this paper, the status of macrobenthos community in coastal water off Yantai, East China, analyzed the community succession and compared it with those of previous surveys, e.g., dominance index, diversity index, richness index, evenness index, Bray-Curtis similarity, and MDS(multidimensional scaling) ordination analysis.
Abstract: To understand the status of macrobenthos community in coastal water off Yantai, East China, we analyzed the community succession and compared it with those of previous surveys. Several indices and methods were adopted, e.g. dominance index, diversity index, richness index, evenness index, Bray-Curtis similarity, and MDS(multidimensional scaling) ordination analysis. In total, 176 species were identified, of which Polychaeta dominated. Lumbrineris latreilli and Sternaspis scutata were dominant species in four seasons. The average values of biomass and abundance were 16.72g/m2 and 1022ind/m2, respectively. The community structure of macrobenthos was closely related to sediment type and depth. Some trends in the community had stayed for 20 years, i.e., the increase in Polychaeta species and decrease in Mollusk species, which could be resulted from anthropogenic activities, including waste discharge, mariculture and fishing, harbor building, and shipping.
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TL;DR: In this paper, a survey was conducted for environmental variables and macrobenthic assemblage structure in September 2012 (Yantai, China). Several methods are adopted in the data analysis process: dominance index, diversity indices, cluster analysis, non-metric multi-dimentional scaling ordination, AMBI and M-AMBI.
Abstract: To understand the ecological status and macrobenthic assemblages of the Xin’an River Estuary and its adjacent waters, a survey was conducted for environmental variables and macrobenthic assemblage structure in September 2012 (Yantai, China). Several methods are adopted in the data analysis process: dominance index, diversity indices, cluster analysis, non-metric multi-dimentional scaling ordination, AMBI and M-AMBI. The dissolved inorganic nitrogen and soluble reactive phosphorus of six out of eight sampling stations were in a good condition with low concentration. The average value of DO ((2.89±0.60) mg/L) and pH (4.28±0.43) indicated that the research area faced with the risk of ocean acidification and underlying hypoxia. A total of 62 species were identified, of which the dominant species group was polychaetes. The average abundance and biomass was 577.50 ind./m2 and 6.01 g/m2, respectively. Compared with historical data, the macrobenthic assemblage structure at waters around the Xin’an River Estuary was in a relatively stable status from 2009 to 2012. Contaminant indicator species Capitella capitata appeared at Sta. Y1, indicating the animals here suffered from hypoxia and acidification. AMBI and M-AMBI results showed that most sampling stations were slightly disturbed, which were coincided with the abiotic measurement on evaluating the health conditions. Macrobenthic communities suffered pressures from ocean acidification and hypoxia at the research waters, particularly those at Stas Y1, Y2 and Y5, which displays negative results in benthic health evaluation.
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