尕海湖冬季原生动物群落结构及营养功能类群分析

Analysis of community structure and functional-trophic group of Protozoa in Gahai Lake in Winter

自2011年10月至2012年1月,利用"非淹没培养法"和活体观察法调查研究了尕海湖内冬季水生原生动物的群落结构特征和物种多样性,共鉴定到原生动物44种,隶属于2门5纲15目28科31属,包括1个未定名种。其中纤毛门物种为优势类群,占鉴定到物种数的61.36%,肉鞭门物种有17种,占鉴定到物种总数的38.64%。对44种原生动物的食性分析结果显示,食菌-碎屑者(B组)为主要类群,共有28种,占所有原生动物总数的63.64%;食藻者(A组)物种次之,有10种,占物种总数的22.73%;腐养者(S组)物种最少,只有2种。从营养功能类群分析来看,尕海湖冬季的水质较差,有待于进一步治理和保护。

Species diversity of Protozoa in the Gahai Lake was studied based on 'non-flooded petri dish method' and in vivo observation from October 2011 to January 2012.A total of 44 species including 1 unnamed species,belonging to 2 phyla,5 classes,153 orders,28 families and 31 genera,were identified.Ciliophora was the dominant group and the number of species occupied 61.36% of the total.Sarcomastigophora with 17species occupied about 38.64% of the total.Analysis of diet of 44 Protozoa indicated that Bactivores-detritivores(B group) was the major group and Algivores(A group) was the second one,which consisted of 28 species and 10species,occupied 63.64% and 22.73%,respectively.Saprotrophs(S group) with 2 species was the least group.We concluded that the quantity of water in the Gahai Lake was worse in winter based on the functional-trophic group of Protozoa,and it needs further treatment and protection.