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引用本文:胡梦红,杨丽丽,刘其根.竞争捕食作用对千岛湖浮游动物群落结构的影响.湖泊科学,2014,26(5):751-758. DOI:10.18307/2014.0513
HU Menghong,YANG Lili,LIU Qigen.Effects of predation and competition on zooplankton community structure in Lake Qiandao. J. Lake Sci.2014,26(5):751-758. DOI:10.18307/2014.0513
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竞争捕食作用对千岛湖浮游动物群落结构的影响
胡梦红1,2, 杨丽丽1,2, 刘其根1,2
1.上海海洋大学水产与生命学院, 农业部水产种质资源与利用重点开放实验室, 上海 201306;2.上海海洋大学水产与生命学院, 上海 201306
摘要:
竞争与捕食作用是调节湖泊和池塘等淡水生态系统结构的主要动力,并且影响着浮游动物的群落结构和种群动态变化.为了阐明生物因素对千岛湖浮游动物群落结构的影响,于2009 2010年对千岛湖浮游动物群落结构变化规律进行调查.利用Pearson相关性分析和多元逐步回归法分析生物因素对千岛湖中浮游动物群落结构的影响.对千岛湖1999、2004、2007 2010年的鲢鳙鱼生物量和浮游动物生物量的统计分析表明,1999年鲢鳙鱼的生物量约为2004、2007 2010年年平均生物量的1/5,而轮虫和桡足类生物量变化不大,枝角类中盔形溞密度下降.鲢鳙鱼放养后浮游植物密度下降,而大型浮游动物(如盔形溞)的密度变化趋势与浮游植物相一致,因此推断鲢鳙鱼的放养将对千岛湖浮游动物群落结构产生影响.
关键词:  浮游动物  竞争  捕食  群落结构  鲢鱼  鳙鱼  千岛湖
DOI:10.18307/2014.0513
分类号:
基金项目:国家自然科学基金项目(31072218);农业部农业公益性行业科研专项项目(201303056);上海市教育委员会科研创新项目(13YZ093);上海高校青年教师培养资助计划项目(ZZhy12001)联合资助
Effects of predation and competition on zooplankton community structure in Lake Qiandao
HU Menghong1,2, YANG Lili1,2, LIU Qigen1,2
1.Key Laboratory of Aquatic Genetic Resources and Utilization, Ministry of Agriculture, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, P. R. China;2.College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, P. R. China
Abstract:
Predation and competition are the main factors regulating population dynamic of freshwater organisms and also the most important structuring forces in freshwater ecosystems. Lake Qiandao is a large deep reservoir where pelagic community is dominated by silver carp Hypophthalmichthys molitrix and bighead carp Aristichthys nobilis. In order to understand the effects of biological factors affecting zooplankton community structure in the upper, middle, and lower reaches of Lake Qiandao, a two-year study was conducted monthly from 2009 to 2010. Pearson correlation analysis and stepwise multiple regression were applied to identify the major biological factors influencing zooplankton community variations. Comparing the data to the previous studies, the present study revealed that the biomass of silver carp and bighead carp in 1999 was one fifth of the average in 2004 and in the period from 2007 to 2010, and the biomass of rotifer and copepod almost kept constant, while Daphnia hyaline biomass decreased substantially which was caused by the decrease of phytoplankton biomass. Hence, we suggest the bighead carp might affect the zooplankton community structure significantly in Lake Qiandao.
Key words:  Zooplankton  competition  predation  community structure  sliver carp  bighead carp  Lake Qiandao
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