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The effects of river-level oscillations on the macroinvertebrate community in a river-floodplain system

机译：河流水平振荡对河洪水系统河流界的影响

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摘要

Extreme climatic events, such as flooding and drought, can abruptly modify the amplitude of the river level of a river, promoting new environmental conditions and impacting aquatic communities. Furthermore, an increasing frequency of extreme droughts in dammed rivers is expected because dams homogenize the flood pulse and decrease the river level. In this study, we evaluated the effects of extreme river-level oscillations on the benthic macroinvertebrate communities in a floodplain river. We analysed 47 years of river-level data and 17 years of benthic macroinvertebrate data. Our findings indicated that (1) extreme river-level oscillations promoted environmental conditions that were distinct from the regular oscillation; moreover, environmental characteristics were more heterogeneous in extreme oscillations than regular oscillations; (2) extreme oscillations were associated with a decreased richness, density, and diversity of benthic macroinvertebrates, promoting the dominance of tolerant taxa. Furthermore, in the studied river, a large hydroelectric power plant was built 19 years ago, which (3) decreased the river-level downstream, accentuating the occurrence of extreme drought, which has become more common after damming. We emphasize the importance of long-term biological monitoring considering the more frequent occurrence of extreme river-level oscillations in response to factors such as dam building and climate change.
机译：极端气候事件，如洪水和干旱，可以突然修改河流的幅度，促进新的环境条件和影响水生社区。此外，预期钓鱼河中极端干旱的频率增加，因为水坝均匀化洪水脉冲并降低河流。在这项研究中，我们评估了极端河流振荡对洪水河流底栖河流社区的影响。我们分析了47岁的河流数据和17年的底栖大型虚拟近期数据。我们的研究结果表明（1）极端河流振荡促进了与常规振荡不同的环境条件;此外，环境特征在极端振荡中比常规振荡更加异质; （2）极端振荡与底栖大型脊椎动物的丰富性，密度和多样性降低有关，促进耐受性分类的优势。此外，在学习的河流中，19年前建于大型水力发电厂，（3）（3）减少了下游的河流水平，诱惑了极端干旱的发生，在坝后变得更加普遍。我们强调了长期生物监测的重要性，考虑到响应大坝建设和气候变化等因素的因素越来越频繁地发生极端河流振荡。

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