摘要:
作者对长江中下游的湖北省保安湖的扁担塘、桥墩湖区、青菱湖的有草区(称南青菱湖)和无草区(称北青菱湖)及黄家湖等五个湖泊(区)浮游动物的种类组成、密度、多样性进行了研究。扁担塘常见浮游动物104种,桥墩湖107种,南青菱湖89种,北青菱湖73种,黄家湖88种,浮游动物的种类均随着水草生物量的减少而下降。浮游动物的密度均随着水草生物量的减少而增多。上述湖泊(区)浮游动物无论是种类组成还是密度均以小型的原生动物和轮虫占绝对优势。浮游动物多样性指数的变化与水草的丰度密切相关。随着湖泊水草生物量的增加,浮游动物的多样性指数也随之而增加。
关键词:
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湖泊
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长江中游
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浮游动物
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密度
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多样性指数
Abstract:
This paper embodies the results of species composition, density and diversity of zooplanktons in several lakes in the middle reaches of Changjing River.Quarterly zooplankton samples were collected from Qiaodun Lake and Biandantang of Baoan Lake, South Qinglinghu, North Qinglinghu and Huangjiahu Lakes from 1993 to 1994. 104 species of zooplankton were identified in Biandantang, of which 46 species were protozoa, 35 rotatoria, 17 cladocera, 6 copepoda. 107 species of zooplankton were identified in Qiaodun Lake, with 45 being protozoa,37 rotatoria, 19 cladocera,6 copepoda. 89 species of zooplanktons were identified in South Qinglinghu, 37 of which were protozoa, 34 rotatoria,13 cladocera, 5 copepoda. 73 species of zooplanktons were identified in North Qinglinghu Lake, (28 protozoa, 28 Rotatoria,13 Cladocera, 4 copepoda). 88 species of zooplanktons were identified in Huangjiahu Lake (31 protozoa, 39 rotatoria, 13 cladocera, 5 copepod).The number of species of zooplanktons were reduced with the decrease of macrophyte biomass.The annual average density of zooplanktons were 2696 ind./L, 2706 ind./L, 1835 ind. /L, 3360 ind./L, 3793ind. /L, respectively in Biandantang, Qiaodun Lake, South Qinglinghu, North Qinglinghu and Huangjiahu Lake. In the water body surveyed,small protozoa and rotatoria were predominant in species composition and density of zooplanktons. The zooplankton density increased with the decrease of macrophyte biomass.The annual average diversity indexes of zooplankton were 3.2981, 3.4404, 3.2094,2.7119, 2.3961, respectively in five water bodies (Biandantang, Qiaodun Lake South Qinglinghu, North Qinglinghu, Huangjiahu Lake). The diversity index of zooplankton increased with the increase of macrophyte biomass.
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