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Variation in fish assemblages across impoundments of low-head dams in headwater streams of the Qingyi River, China: effects of abiotic factors and native invaders

机译:中国青衣河上游水位低头坝蓄水区鱼群的变化:非生物因素和本土入侵者的影响

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Identifying and explaining the pattern of how stream fish assemblages vary spatially are basic for the conservation and management of fish species diversity. Although low-head dams may facilitate the native invasions of generalist fishes to headwater streams, few studies have evaluated the impacts of the native invaders on indigenous fish assemblages. In this study, we collected 12 indigenous and 13 native-invasive fish species and measured physical habitats and dam dimensions from 62 impoundments of low-head dams located on headwater streams of the Qingyi River, China. We used linear regression and canonical correspondence analyses to evaluate how habitat and dam variables influenced native-invasive fish assemblages. Our results indicated that invasive fish species richness and abundance were related to elevation and upstream and downstream dam abundances, and their assemblage structures were influenced by substrate heterogeneity, dam height, and upstream and downstream dam abundances. We also used similar analyses to examine how habitat, dam, and invasive fish variables affected indigenous fish assemblages. Our results showed that indigenous fish species richness was correlated with substrate heterogeneity and dam height. However, indigenous fish assemblage structures were not only influenced by dam height, substrate, and downstream dam abundance, but also by invasive fishes. The abundance of one invasive species, Pseudorasbora parva, showed a strong negative influence on indigenous fish assemblages. Our study suggests that the combination of changes in abiotic factors and biotic structure and process following dam-building may determine the indigenous fish assemblages in the impoundments of low-head dams within headwater streams.
机译:识别和解释溪流鱼类组合在空间上如何变化的模式,对于养护和管理鱼类物种多样性至关重要。尽管低水位大坝可能促进多才多艺的鱼类向上游水源的本地入侵,但很少有研究评估本地入侵者对本地鱼类种群的影响。在这项研究中,我们收集了12种本土鱼类和13种本土入侵鱼类,并从位于中国青义河上游水位的62座低水位大坝的水库中测量了自然栖息地和水坝的大小。我们使用线性回归和典范对应分析来评估栖息地和大坝变量如何影响原生入侵鱼类种群。我们的研究结果表明,入侵性鱼类物种的丰富度和丰度与海拔,上游和下游大坝的丰度有关,并且它们的组装结构受基质异质性,坝高和上游和下游大坝的丰度影响。我们还使用类似的分析来检查生境,水坝和入侵性鱼类变量如何影响土著鱼类种群。我们的结果表明,本地鱼类物种丰富度与基质异质性和坝高相关。但是,土著鱼类的聚集结构不仅受大坝高度,底物和下游大坝丰度的影响,还受到入侵鱼类的影响。一种入侵物种Pseudorasbora parva的丰度显示出对土著鱼类种群的强烈负面影响。我们的研究表明,水坝建成后,非生物因素,生物结构和过程的变化可能决定了上游水源中低水位大坝蓄水区的本地鱼类组合。

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