生物多样性 ›› 2009, Vol. 17 ›› Issue (5): 512-517.DOI: 10.3724/SP.J.1003.2009.09008

• 论文 • 上一篇    下一篇

三峡水库初次蓄水后干流库区枝角类的空间分布与季节变化

吴惠仙1 , 姚建良3 , 刘艳1 , 薛俊增1,2* , 蔡庆华2 , 刘建康2   

  1. 1 (上海海洋大学省部共建水产种质资源发掘与利用教育部重点实验室, 上海 200090)
    2 (淡水生态与生物技术国家重点实验室, 武汉 430072)
    3 (新疆农业大学农学院, 乌鲁木齐 830052)
  • 收稿日期:2009-03-30 出版日期:2009-09-20 发布日期:2009-09-20
  • 通讯作者: 薛俊增

Seasonal variation and longitudinal distribution characters of cladocer-ans in the Three Gorges Reservoir

Huixian Wu1, Jianliang Yao3, Yan Liu1, Junzeng Xue1,2*, Qinghua Cai 2, Jiankang Liu2   

  1. 1 Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Shanghai Ocean University, Ministry of Education, Shanghai 200090
    2 State Key Laboratory of Freshwater Ecology and Biotechnology, Wuhan 430072
    3 Agronomy College, Xinjiang Agriculture University, Urumqi 830052
  • Received:2009-03-30 Online:2009-09-20 Published:2009-09-20
  • Contact: Junzeng Xue

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。

Abstract:

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.