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Xian LI, Yu-Ru LI, Ling CHU, Ren ZHU, Li-Zhu WANG, Yun-Zhi YAN. 2016: 局域栖息地、支流位置和水坝特征对低头坝蓄水区鱼类群落的影响-以青弋江河源溪流为例. 动物学研究, 37(2): 67-74. DOI: 10.13918/j.issn.2095-8137.2016.2.67
引用本文: Xian LI, Yu-Ru LI, Ling CHU, Ren ZHU, Li-Zhu WANG, Yun-Zhi YAN. 2016: 局域栖息地、支流位置和水坝特征对低头坝蓄水区鱼类群落的影响-以青弋江河源溪流为例. 动物学研究, 37(2): 67-74. DOI: 10.13918/j.issn.2095-8137.2016.2.67
Xian LI, Yu-Ru LI, Ling CHU, Ren ZHU, Li-Zhu WANG, Yun-Zhi YAN. 2016: Influences of local habitat, tributary position, and dam characteristics on fish assemblages within impoundments of low-head dams in the tributaries of the Qingyi River, China. Zoological Research, 37(2): 67-74. DOI: 10.13918/j.issn.2095-8137.2016.2.67
Citation: Xian LI, Yu-Ru LI, Ling CHU, Ren ZHU, Li-Zhu WANG, Yun-Zhi YAN. 2016: Influences of local habitat, tributary position, and dam characteristics on fish assemblages within impoundments of low-head dams in the tributaries of the Qingyi River, China. Zoological Research, 37(2): 67-74. DOI: 10.13918/j.issn.2095-8137.2016.2.67

局域栖息地、支流位置和水坝特征对低头坝蓄水区鱼类群落的影响-以青弋江河源溪流为例

Influences of local habitat, tributary position, and dam characteristics on fish assemblages within impoundments of low-head dams in the tributaries of the Qingyi River, China

  • 摘要: 低头坝蓄水可改变局域栖息地特征及鱼类群落,但是,低头坝蓄水区的鱼类群落如何同局域栖息地、支流位置和水坝特征相联系尚不清楚。基于对青弋江河源溪流中62个低头坝坝上蓄水区的调查数据,本文研究了局域栖息地、支流位置和水坝特征这三类环境因素对蓄水区鱼类群落物种数及物种组成的影响及其相对重要性。线性回归模型显示,鱼类物种数受底质异质性(栖息地)、汇合量级(支流位置)和上游水坝数量(水坝特征)的显著影响;冗余分析显示,鱼类物种组成同底质异质性、汇合量级、坝高、上/下游水坝数量显著相关。同局域栖息地和支流位置相比,水坝特征变量与鱼类物种数的相关性更高,但同物种组成的相关性较低。本研究表明,低头坝可通过改变局域栖息地、限制鱼类运动而影响坝上蓄水区的鱼类物种数,但蓄水区鱼类物种组成的分布则主要取决于局域栖息地条件和溪流大小特征。

     

    Abstract: Low-head dam impoundments modify local habitat and alter fish assemblages; however, to our knowledge, the pattern of how fish assemblages in the impoundments relate to local habitat, tributary position, and dam characteristics is still unclear. We used data collected in 62 impoundments created by low-head dams in headwater streams of the Qingyi River, China, to examine relationships between fish assemblages and local habitat, tributary position, and dam characteristics. We also assessed the relative importance of the three groups of factors in determining fish species richness and composition. Linear regression models showed that fish species richness was related to substrate heterogeneity, confluence link, and dam number upstream. Redundancy analysis showed that fish species compositions were influenced by substrate heterogeneity, confluence link, dam height, dam numbers upstream and downstream. Overall, dam characteristics were more important in affecting fish species richness but less important in determining fish species composition than local habitat (i.e., substrate heterogeneity) and tributary position. Our results suggest that low-head dam may affect fish species richness in impoundments by modifying local habitat and constraining fish movement, and the relative abundances of those fish species may depend more on species habitat presences and stream size than on impoundment size and number.

     

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