Community structure of macrobenthos in Tieshangang seawaters of Beihai city
In March 2021 and September 2021,a survey of macrobenthos was carried out in Tieshangang seawaters of Beihai city.Samples from 24 stations were collected in the seawaters,and used for species identification,and the density,biomass and Bray-curtis similarity coefficient of macrobenthos species and sediment quality were analyzed.The abundance/biomass curve(ABC curve)of macrobenthos were plotted and the disturbance of macrobenthos was analyzed.The results showed that a total of 42 species of macrobenthos were collected,including 19 of annelidas,11 of arthropods,6 of mollusks,2 of echinoderms and chordates,and 1 of neoglyphs and cnidarians each.The average density and average biomass of macrobenthic animals were 141 ind·m-2 and 96.95 g·m-2.The dominant species were Ruditapes philippinarum and Xenophthalmus pinnotheroides in spring and Branchiostoma belcheri in autumn.The average value of Shannon-Wiener index(H′)was 1.73 in spring and 1.25 in autumn.The standard index of each evaluation factor of sediment was less than 1.The ABC analysis showed that all the stations were not disturbed except for F06 station,which was moderately disturbed in spring.All stations were undisturbed in autumn.In general,the macrobenthos community in the survey seawaters was stable.The cluster analysis and MDS analysis showed that the community similarity of each station was low in spring and in autumn.
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