新疆吉木乃县红山水库轮虫多样性

Diversity of Rotifers in Hongshan Reservoir in Jimunai County in Xinjiang Uygur Autonomous Region

红山水库是新疆阿勒泰地区吉木乃县的天然水源型水库。为了解该水库轮虫群落动态特征,于2008年7月(平水期)、10月(枯水期)、2009年5月(丰水期)对该水库轮虫生态学进行研究,共鉴定轮虫24种,隶属于7科16属。平水期优势种为缘板龟甲轮虫(Keratella ticinensis)、螺形龟甲轮虫(Keratella cochlearis)、针簇多肢轮虫(Polyarthra trigla),枯水期优势种更替为缘板龟甲轮虫、矩形龟甲轮虫(Keratella quadiata)、裂痕龟纹轮虫(Anuraeopsis fissa)、针簇多肢轮虫(Polyarthra trigla)、暗小异尾轮虫(Trichocera pusilla),次年丰水期优势种由矩形龟甲轮虫、针簇多肢轮虫、长三肢轮虫(Filinia longiseta)等组成。库区水体中轮虫的种类组成、密度、多样性指数等呈典型的时间相关性,不同时期轮虫密度变化趋势为:丰水期((4.87±1.04)×102/L)>平水期((4.65±2.27)×102/L)>枯水期((1.23±0.57)×102/L)。结果表明,红山水库库区水容量变化及水温波动导致的浮游植物种类变化是影响轮虫种类组成、密度和多样性指数的主要原因。

Hongshan Reservoir,located in Jimunai County,is an open water supplier,as one of many reservoirs in Xinjiang Uygur Autonomous Region.It is an important water resource for fishery.In order to understand the dynamic characteristics of the rotifer community,investigations were carried out in July 2008,October 2008 and May 2009.A total of 24 species belonging to 7 bagridaes and 16 genuses were identified,including 7 dominant species,that is,Keratella ticinensis,Keratella cochlearis,Keratella quadiata,Polyarthra trigla,Filinia longiseta,Anuraeopsis fissa as well as Trichocera pusilla.The Brachionidae is accounted for 21% of the collectivity,and the Lecanidae is accounted for 21%.The rotifer density was the greatest in the wet season（4.87±1.04）×102/L,and was the smallest in the dry season（1.23±0.57）×102/L.The rotifer composition,biomass density,diversity were found to be closely related to the different phytoplankton composition,temperature and the water volume of Hongshan Reservoir.