广东海门湾大型底栖生物生态研究

Macrobenthic ecological study in Haimen Bay, Guandong

海门湾大型底栖生物已鉴定193种，其中多毛类、软体动物和甲壳动物占总种数的79．79％。两季平均生物量为133．21g／m2，平均栖息密度为543个／m2。根据Bray－Curtis相似性系数和多维排序尺度可划分为三个群落：Ⅰ短吻虫-长腿三强蟹-奇异鳃稚虫-彩虹明樱蛤群落；Ⅱ奇异鳃稚虫-鸟啄小脆蛤-艾氏活额寄居蟹-短吻虫群落；Ⅲ捧锥螺-纵肋织纹螺-弯六尺蟹群落。应用丰度生物量比较法和部分优势度显示群落Ⅱ受到扰动，群落Ⅰ、Ⅲ相对稳定。

The species composition,quantity distribution and community structure are analyzed inthis paper. All of 193 species of macrobenthos have been identified in Haimen Bay,Guangdong. Three groups of species number, Polychaetes, Mollusc and Crustaceans accountfor 79. 79% of that of all species number. The average biornass and inhabit density are 133.21g/m2 and 543 ind. /m2 respectively in May and September. There are 3 communities ofmacrobenthos in Haimen Bay: communty I: Listriolobus brevirostris-TritodynamialoongiPropodum-Paraorionospio pinnata-Moerella iridescens; Community Ⅱ:P. pinnata-Raetellopes pulchella-L. brevirostris; Community Ⅲ:Turritella bacillum-Nassarius vari-ciferus-Hexapus anfracfus. Community Ⅱ has been subjected to disturbance and, but bothcommunity Ⅰ and Ⅲ show a relative high stability.