夏季昌邑海域东、西调查断面大型底栖动物群落结构差异及其影响因素OA北大核心

Based on the macrobenthos and environmental data collected in July 2023 in two sea sections near Changyi in Laizhou Bay,the species composition,dominant species,abundance,biomass,and diversity were stud-ied and compared with the historical data.Additionally,the macrobenthic community structure and its influencing factors were also analyzed.A total of 55 macrobenthic species were collected,including 24 of Polychaeta,14 of Mollusca,12 of Crustacea,four of Echinodermata,and one each of other groups.The dominant species were Iri-dona iridescens,Chaetozone setosa,etc.The biomass,Margalef richness index,and Shannon-Wiener diversity in-dex were significantly higher in the western survey section than in the eastern section.Sampling sites in the two sections were roughly classified into two community groups according to the cluster analysis and NMDS ordination.PERMANOVA indicated the species composition between the two groups to vary markedly.The species contrib-uting the most to the difference were Phyllodoce chinensis,Iridona iridescens,etc,as revealed by the SIMPER analysis.Mantel analysis showed that Mollusca was influenced by most environmental variables,and CCA indi-cated that median particle size;Fe and total nitrogen in the sediment;and nitrite,temperature,and pH in the bottom water can remarkably affect the macrobenthic community.Compared with historical data,the species number in the Changyi sea area was less than that in the whole sea or other regions in Laizhou Bay.