长江口及其邻近水域底栖动物生态特点

本文根据1982—1983年四个航次调查的定量资料,对长江口及其邻近水域的底栖动物的种类组成和生物量及栖息密度的分布进行叙述和讨论。调查结果:棘皮动物的生物量居首位,多毛类在调查区广为分布的类群,并占有较大的数量。生物量和栖息密度的分布极不均匀,高生物量和高栖息密度的分布趋势基本相似,两者都在调查区的北部。8月生物量最高,平均为23.27g/m~2;2月最低,平均为10.09g/m~2。8月栖息密度最高,平均为84.8个/m~2;2月最低,平均为20.1个/m~2。同时,还叙述甲壳类的豆形短眼蟹生物量和栖息密度的季节变化。

ECOLOGICAL CHARACTERISTICS OF MACROBENTHICS OF THE CHANGJIANG RIVER ESTUARY AND ADJACENT WATERS

This paper presents the result of ecological studies of the macro-benthic fauna in the Changjiang River estuary and adjacent waters. The materialsfor study were collected in four cruises during 1982-1983. The composition anddistribution of species and density was described and discussed. Relative abundance of Echinodermata is in the area northern to the rivermouth. Poly-chaeta was found everywhere in the surveyed region, but Crustaceawas found abundant in the area northern to the river mouth. The distribution of bio-mass and density is extremely uneven, but both of high biomass and high density were basically similar, in the area northen to Changjiang River estuary. The hi-ghest record of biomass occured in August, being X=23.27gm~(-2), but the lowest inFebruary, being X=10.09gm~(-2). The highest record of density was in August,being X=84.8ind. m~(-2), but the lowest in February, being X=20.1ind.m~(-2). In thispaper, the seasonal change in abundance (biomass and density) of Xenophthalmuspinnotheroides was described too