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首页> 外文期刊>Aquatic Sciences >Comparison between the fish communities of lakes, reservoirs and rivers: can natural systems help define the ecological potential of reservoirs?
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Comparison between the fish communities of lakes, reservoirs and rivers: can natural systems help define the ecological potential of reservoirs?

机译：湖泊，水库和河流鱼类群落之间的比较：自然系统能否帮助定义水库的生态潜力？

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摘要

The European Water Framework Directive (WFD) aims at improving the ecological status of continental waters, including man-made water bodies. Thereby it raises the question of the reference conditions for reservoirs. A number of limnologists consider reservoirs as intermediate systems between lakes and rivers. Hence, the aim of this study is to contribute to the implementation of the WFD by comparing the fish communities across these three types of ecosystems. This was achieved using fish sampling data from 21 natural lakes, 50 reservoirs and 549 river stations. The lists of occurring species are very similar between lakes and reservoirs, and appear as a subset of the species occurring in rivers. Lakes and reservoirs are also very similar in terms of common and rare species. Conversely, the comparison of community structures (summarised by correspondence analysis axes) supports the hypothesis of an intermediate position of reservoirs between lake and river systems. This latter result could reflect the effect of large-scale processes undergone by freshwater ecosystems whatever their type and the non-independence of water bodies within their catchments, particularly when considering the communities of highly mobile organisms like fishes. Although the major conservation concerns are about natural systems, artificial ones should also be considered in monitoring and assessment programs in order to allow efficient catchment-scale management policies.
机译：欧洲水框架指令（WFD）旨在改善包括人工水体在内的大陆水域的生态状况。从而提出了水库参考条件的问题。许多森林学家认为水库是湖泊和河流之间的中间系统。因此，本研究的目的是通过比较这三种类型的生态系统中的鱼类群落来促进WFD的实施。这是通过使用21个天然湖泊，50个水库和549个河站的鱼类采样数据实现的。湖泊和水库之间出现的物种清单非常相似，并且作为河流中出现的物种的子集出现。就常见和稀有物种而言，湖泊和水库也非常相似。相反，社区结构的比较（由对应分析轴进行了总结）支持了湖泊和河流系统之间水库中间位置的假设。后一个结果可能反映淡水生态系统所经历的大规模过程的影响，无论其类型如何，以及流域内水体的非独立性，尤其是考虑到鱼类等高度易移动的生物群落时。尽管主要的保护问题与自然系统有关，但在监测和评估计划中也应考虑采用人工系统，以便制定有效的流域规模管理政策。

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