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《Journal of Northwest A & F University(Natural Science Edition)》 2017-01
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Community structure of ciliates and its relationship to environmental physicochemical variables in upstream of Hanjiang River

LIU Zhifeng;GE Hongguang;ZHAO Zuoping;LI Chen;SONG Fengmin;WANG Yanmin;College of Chemical and Environment Science,Shaanxi Sci-Tech University;Biological Resources Comprehensive Development Collaborative Innovation Center in Qin-Ba Mountain Area;  
【Objective】Ciliates community structure was investigated at the upstream of Hanjiang River to provide basic data for environmental protection and aquaculture.【Method】In 2013,water samples were collected every two months from five different stations in Hanzhong including Liejinba,Liangxidu,Nanliudu,Mengjiadu and Huangjinxia.Community structure of ciliates and its relationship to environmental variables were analyzed using number of species,abundance,Margalef index and Saprobic index.【Result】A total of 98 ciliates species(including six unnamed species)were identified,belonging to three clas-ses,twelve orders,thirty-nine families and forty-five genera.Among the species identified,Hypotrichida and Prostomatida were the dominant groups,followed by Hymenostomatida and Scuticociliatida.The numbers of species in Nanliudu,Mengjiadu,Huangjinxia,Liangxidu and Liejinba sampling sites were 45,43,47,41,and 35,respectively.Huangjinxia had the most abundant species.Dominant species were Coleps hirtus,Litonotus obtusus,Chilodonella uncinata,Chilodonella algivora,Cinetochilum margaritaceum,Cyclidium oblongum,Stentor coeruleus,Oxyticha chlorelligera and Aspidisca costata.Annual changes of ciliate abundance ranged from 20 493 to 85 872L-1,Margalef index ranged from 3.73 to 4.66,and Saprobic index ranged from 1.38 to 1.73.Correlation analysis revealed that species number was significantly positive correlated with ammonia concentration,and abundance was significantly positive correlated with ammonia concentration,nitrate concentration,and biochemical oxygen demand.Saprobic index was significantly positive correlated with ammonia concentration,nitrate concentration,chemical oxygen demand and biochemical oxygen demand,while significantly negative correlated with dissolved oxygen.【Conclusion】The water quality changed as"clean-slight pollution-moderate pollution-slight pollution"from the source to downstream of Hanjiang River.Ammonium nitrogen had the most important influence on ciliate community,followed by nitrate nitrogen,biochemical oxygen demand,chemical oxygen demand,and dissolved oxygen.
【Fund】: 秦巴山区生物资源综合开发协同创新中心自然科学项目(QBXT-Z-(P)-15-8);; 汉中市汉台区社会发展攻关项目(2015-K22)
【CateGory Index】: Q958.8;X52
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