浙江东极岛夏季岩礁潮间带大型底栖动物的群落格局

Community Structure of Large Zoobenthos in Cay Intertidal Zone in Dongji Island of Zhejiang in Summer

分析了浙江东极岛夏季岩礁潮间带大型底栖动物的种类组成、分布和多样性指数等群落特征。结果表明,3个潮间带断面定量采获的大型底栖动物标本共36种,其中软体动物20种,节肢动物8种,环节动物3种,纽虫动物2种,多孔动物、棘皮动物和腔肠动物各1种。3个断面总平均生物量为(30845.0±6766.8)g/m2,总平均密度为(13496±3560)ind./m2。同时,定性采获大型底栖动物共83种,其中软体动物45种,节肢动物17种,脊索动物10种,腔肠动物5种,环节动物4种,棘皮动物2种。大型底栖动物的多样性指数、丰富度指数和均匀度指数分别为1.805～2.027、1.793～2.255和0.603～0.638。东极岛大型底栖动物ABC曲线状况正常,说明该动物群落未受到污染或扰动。

The community characters including species composition,distribution and diversity index of large zoobenthos in cay intertidal zone in Dongji island of Zhejiang in summer were analyzed.The results showed that there were 36 species of large zoobenthos samples collected quantitatively from 3 sections of intertidal zone.Among them,there were 20 species of mollusk,8 species of arthropod,3 species of annelid,2 species of nemertean animals,1 specie of sponge,1 specie of echinoderms and 1 specie of coelenterate.The total average biomass and density of the 3 sections were（30 845.0±6 766.8）g/m2 and（13 496±3 560）ind./m2 resp.Simultaneously,there were 83 species of large zoobenthos collected qualitatively.Among them,there were 45 species of mollusk,17 species of arthropod,10 species of chordate,5 species of coelenterate,4 species of annelid and 2 species of echinoderms.The diversity index,richness index and evenness index of large zoobenthos were 1.805-2.027,1.793-2.255 and 0.603-0.638 resp.The ABC curve of large zoobenthos in Dongji island was normal,indicating that this animal community was not polluted or disturbed.