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首页> 外文期刊>Aquatic Sciences - Research Across Boundaries >Impacts of cascade run-of-river dams on benthic diatoms in the Xiangxi River, China
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Impacts of cascade run-of-river dams on benthic diatoms in the Xiangxi River, China

机译：湘西溪流梯级坝对底栖硅藻的影响。

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The ecological effects of small run-of-river dams on aquatic ecosystems are poorly understood, especially on downstream benthic algal communities. We examined impacts of such dams on the benthic diatom community at a regional scale in the Xiangxi River, China. A total of 90 sites were visited, which were divided into five habitats (H1–H5) according to impact extent of each dam. Using partial least squares (PLS) modeling, we developed two predictive models (diatom species richness and total diatom density) based on environmental variables of an unregulated habitat (H1). These models were then used to predict species richness and total densities at impacted habitats (H2–H5) and residuals, i.e. the differences between observed and predicted values, were used to evaluate impact strength of flow regulation. Significant impacts of flow regulation on diatom species richness were detected at three impacted habitats (H3–H5), where observed species richness were significantly higher—70.6, 63.9 and 46.6%, respectively—than predicted values. Then, possible mechanisms for observed impacts were discussed. Further research is necessary to address the potential negative impacts of cascade run-of-river dams on other aquatic organisms in different seasons, and to explore more appropriate mechanisms for such impacts, which may lead to sustainable management strategies and help to determine the optimal ecological water requirement for the Xiangxi River. Keywords Benthic diatoms - Cascade run-of-river dams - PLS models - Xiangxi River
机译：小型河上游大坝对水生生态系统的生态影响知之甚少，尤其是对下游底栖藻类群落。我们在中国湘西地区的区域尺度上研究了此类水坝对底栖硅藻群落的影响。总共访问了90个地点，根据每个大坝的影响程度将其分为五个栖息地（H1-H5）。使用偏最小二乘（PLS）建模，我们基于不受管制的栖息地（H1）的环境变量开发了两个预测模型（硅藻物种丰富度和总硅藻密度）。然后将这些模型用于预测受影响生境（H2-H5）的物种丰富度和总密度，并将残差（即观测值与预测值之间的差）用于评估流量调节的影响强度。在三个受影响的生境（H3-H5）中，流量调节对硅藻物种丰富度的影响显着，观察到的物种丰富度显着高于预测值，分别为70.6、63.9和46.6％。然后，讨论了观察到的影响的可能机制。有必要进行进一步的研究，以解决梯级河上游大坝在不同季节对其他水生生物的潜在负面影响，并探索更适当的机制来影响此类影响，这可能会导致可持续的管理策略并有助于确定最佳的生态环境。湘西河的需水量。底栖硅藻-级联河水坝-PLS模型-湘西河

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