Effects of small hydropower plants on fish assemblages in medium‐sized streams in central and northern Portugal
Effects of small hydropower plants on fish assemblages in medium‐sized streams in central and northern Portugal
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DOI：
10.1002/aqc.735
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发表时间：
2006-06
影响因子：
2.4
通讯作者：
J. Santos;M. T. Ferreira;A. Pinheiro;J. Bochechas
中科院分区：
文献类型：
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作者：
J. Santos;M. T. Ferreira;A. Pinheiro;J. Bochechas
1. 在过去十年中，小型水电项目的开发一直是能源部门最活跃的领域之一。此类项目面临的主要环境挑战之一与鱼类通道有关。2. 在1998年和1999年夏季，通过比较小水电厂以上和以下36个地点的鱼类组合组成和结构，调查了18个小水电厂（SHPs）不同水平的鱼过鱼效率的影响。3. 在效果方面，估计有8个（44.4%）通道设施适合目标物种，其余10个（55.6%）通道设施不适合目标物种。在这两种情况下，SHPs上游和下游的鱼类组合组成都没有明显差异，而组合相似性相对较高。4. 多变量技术确定覆盖度、深度和粗底是构成鱼类组合的主要参数。这些变量创造了丰富的、斑驳的、异质的生境，从而提供了鱼类所需的令人满意的资源和有利条件，并有助于维持鱼群组合。5. 虽然发生在shp上游和下游的一些物种种群在大小结构上存在差异，但shp引起的鱼类种群碎片化可能不一定导致半隔离种群之间的遗传分化。版权所有©2006约翰威利父子有限公司
1. Over the last decade the development of small hydropower projects has been one of the most active areas of the energy sector. One of the main environmental challenges faced by such projects is related to fish passage. 2. The impact of 18 small hydropower plants (SHPs) with distinct levels of fish-pass effectiveness was investigated in the summers of 1998 and 1999 by comparing fish assemblage composition and structure at 36 sites, above and below SHPs. 3. With regard to effectiveness, it was estimated that eight (44.4%) of the surveyed passage facilities were suitable for target species, whereas the remaining 10 (55.6%) were considered unsuitable. In neither case did the composition of fish assemblages upstream and downstream from SHPs differ significantly, while assemblage similarity was relatively high. 4. Multivariate techniques identified cover, depth and coarse substrate as the main parameters structuring fish assemblages. It is suggested that these variables have created a rich, patchy, heterogeneous habitat, thereby providing satisfactory resources and favourable conditions required by fish and contributing to the maintenance of assemblages. 5. Although populations of some species that occurred both upstream and downstream from SHPs have developed differences in their size structures, SHP-induced fragmentation of fish populations may not necessarily result in genetic divergence among semi-isolated populations. Copyright © 2006 John Wiley & Sons, Ltd.