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

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.