The Structure Characteristics of the Intertidal Zone Macrobenthos Community in Guanhe Estuary in Spring and Autumn
In order to study the spatial-temporal change of the macrobenthos community in intertidal zone in Guanhe estuary,quantitative investigations was carried out in 2 sections in the north and south banks of Guanhe estuary in May(spring)and August(autumn)in 2021.A total of 58 species from 7 phylums was identified,including 30 species from Annelida(51.72％),12 species from Mollusca(20.69％),10 and species from Arthropoda(17.24％),2 species from Chordata(3.45％),2 species from Nemertea(3.45％),1 species from Echinodermata(1.72％),1 species from Sipuncula(1.72％).Species number was higher in spring than in autumn,furthermore,more species were collected in SEC2 than in SC1.Euclymene annandalei,Nephtys sp.,Perinereis aibuhitensis,Mactra veneriformis,Helice tientsinensis,Corophium sinense and Amphiporus punctatulus were the dominant species,Thereinto,Mactra veneriformis was dominant both in Spring and Autumn.Spatial and temporal distribution of the density and biomass was affected by the life history strategy of the dominant species and habitat difference in 2 intertidal sections,both density and biomass of the macrobenthos was higher in spring than in autumn in SEC1,however,SEC2 was the polar opposite of the SEC1;density of the macrobenthos was higher in SEC2 than in SEC1 both in spring and autumn,biomass of the macrobenthos was higher in SEC1 than in SEC2 in spring whereas in autumn it was the opposite.Tidal zone distribution of the dominant species showed the geographical features of subtropical estuarine wetland,polychaetes mainly distributed in supratidal zone whereas mollusc mainly distributed in mid and subtidal zone.Average Shannon-Weiner index was higher in spring than in autumn both in SEC1 and SEC2,average W index in SEC1 was higher in autumn than in spring,average W index in SEC2 was higher in spring than in autumn.Average Shannon-Weiner index and W index was higher in SEC1 than in SEC2 both in spring and autumn.Ecological environment of the intertidal zone in Guanhe estuary was in light pollution appearances,W index showed that the macrobenthos community was lightly interfered.
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