保安湖底栖动物资源及季节动态的研究

1986至1987年对湖北省保安湖的底栖动物进行了调查.采到底栖动物计61种,其中寡毛类14种,水生昆虫25种,软体动物17种,其它动物5种。苏氏尾鳃蚓、霍甫水丝蚓、多足摇蚊、羽摇蚊、幽蚊、白旋螺、长角涵螺和铜锈环棱螺为湖中优势种.全湖底栖动物的平均密度为460个/m~2,生物量为55.415g/m~2.密度以冬季最高,生物量则以秋季最大.不同湖区中底栖动物的现存量有一定差别:密度依次为肖四海>桥墩湖>保安口>大湖>扁担塘;生物量为扁担塘>肖四海>保安口>大湖>桥墩湖.本文还将保安湖与其它浅水湖泊的底栖动物进行了比较,并提出该湖底栖动物的渔业利用的初步意见。

Preliminary study on zoobenthic resource and its seasonal fluctuation in baoan lake

The Present work was carried out during 1986-1987. Sixty-one zoobenthic species (including 14 species belonging to aquatic oligochaetes, 25 to aquatic insects, 17 to molluscs and 5 to other taxa) were found. Among them, Branchiura sowerbyi, Limnodrilus hoffmeisieri, Polypedilum sp., Chironomus plumosus, Chaoborus sp., Gyraulus albus, Alocinma longicornis and Bellamya aeruginosa are predominant.The mean density of the zoobenthos in the lake as a whole was 460ind/m² and the biomass was 55.415g/m². The highest density of the zoobenthos was found in winter, while the highest biomass was in autumn. Standing crops of the zoobenthos varied with different subregions of the lake. Population densities revealed a gradual diminution according to the following order:Xiaosihai>Qiaodunhu>Baoankou>Dahu>Biandantang. In terms of biomass, such order was found to be Biandantang>Xiaosihai>Baoankou>Dahu Qiaodunhu.A comparison of the zoobentbos of Baoan lake with that of the other lakes is presented. The possible fishery utilization of the zoobenthic resource in the lake is also discussed.