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Conservation strategies for endemic fish species threatened by the Three Gorges Dam

机译：三峡大坝对特有鱼类物种的保护策略

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The largest damming project to date, the Three Gorges Dam has been built along the Yangtze River (China), the most species-rich river in the Palearctic region. Among 162 species of fish inhabiting the main channel of the upper Yangtze, 44 are endemic and are therefore under serious threat of global extinction from the dam. Accordingly, it is urgently necessary to develop strategies to minimize the impacts of the drastic environmental changes associated with the dam. We sought to identify potential reserves for the endemic species among the 17 tributaries in the upper Yangtze, based on presence/absence data for the 44 endemic species. Potential reserves for the endemic species were identified by characterizing the distribution patterns of endemic species with an adaptive learning algorithm called a "self-organizing map" (SOM). Using this method, we also predicted occurrence probabilities of species in potential reserves based on the distribution patterns of communities. Considering both SOM model results and actual knowledge of the biology of the considered species, our results suggested that 24 species may survive in the tributaries, 14 have an uncertain future, and 6 have a high probability of becoming extinct after dam filling. [References: 51]
机译：迄今为止最大的筑坝工程是三峡大坝，它是在长江（中国）上建造的，长江是古北地区物种最多的河流。在长江上游主要河道的162种鱼类中，有44种是地方性的，因此受到大坝全球灭绝的严重威胁。因此，迫切需要制定策略以最大程度地减少与大坝相关的剧烈环境变化的影响。我们基于44种特有物种的有无数据，试图确定长江上游17个支流中特有物种的潜在储量。通过使用称为“自组织图”（SOM）的自适应学习算法表征特有物种的分布模式，可以确定特有物种的潜在储备。使用这种方法，我们还根据社区的分布模式预测了潜在保护区中物种的发生概率。考虑到SOM模型结果和所考虑物种生物学的实际知识，我们的结果表明，有24种可能在支流中生存，14种具有不确定的未来，而6种在大坝填塞后很可能灭绝。 [参考：51]

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