摘要
为了阐明三峡水库初次蓄水后干流库区枝角类的时空分布规律,2004年4月至2005年1月,在600余公里干流库区设置10个样点,定性和定量采集枝角类标本。本次调查共采到9种枝角类,其中春季8种,夏季5种,秋季2种,冬季3种。枝角类种类组成的空间分布差异明显,河流状态的江段有4种,水库状态的江段有7种,水库状态的江段距大坝越近,枝角类种类越丰富。枝角类的密度和生物量的空间分布和季节变化规律一致,季节间差异极显著(P<0.01),春季最高,夏季次之,秋季和冬季较低;空间分布上表现为在干流库区的纵向分布上差异极显著(P<0.01),河流状态样点远低于水库状态的样点,水库上游江段又低于下游坝前段。结果显示三峡水库的枝角类具有明显的纵向分布和季节变化特征。
To reveal patterns of longitudinal distribution, seasonal variation, and ecological succession in cladocerans communities in the Three Gorges Reservoir, ten sites were used to sample cladoceran communities across a longitudinal gradient from April, 2004 to January, 2005. Nine cladoceran species were collected throughout the year. Species richness was highest in spring （8 species）, lower in summer （5 species） and winter （3 species）, and lowest in autumn （2 species）. Cladoceran species composition varied across sampling sites. Four species were collected from river sampling sites and seven species from reservoir sampling sites. Cladoceran species richness decreased gradually with increasing distance to the dam within the reservoir area. Cladoceran density and biomass varied among seasons （P 〈0.01） and sampling sites （P 〈0.01）, and both were highest in spring. Density and biomass of cladocerans in river areas were lower than in the reservoir area. Density and biomass of cladoceran in up area of reservoir was lower than that in down area of reservoir. The cladoceran communities of the Three Gorges Reservoir showed distinct patterns in both longitudinal distribution and seasonal variation.
出处
《生物多样性》
CSCD
北大核心
2009年第5期512-517,共6页
Biodiversity Science
基金
国家自然科学基金(30570295)
淡水生态与生物技术国家重点实验室开放课题(2004B03)
中科院知识创新工程重要方向项目(KSCX2-SW-111)
上海市重点学科建设项目(S30701)资助
关键词
浮游动物
群落生态
长江三峡
水库
cladoceran, zooplankton, community ecology, Yangtze River
