Basin-scale effects of small hydropower on biodiversity dynamics

Lange, Katharina; Meier, Philipp; Trautwein, Clemens; Schmid, Martin; Robinson, Christopher T; Weber, Christine; Brodersen, Jakob (2018). Basin-scale effects of small hydropower on biodiversity dynamics. Frontiers in ecology and the environment, 16(7), pp. 397-404. Ecological Society of America 10.1002/fee.1823

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Construction of small hydropower plants (<10 megawatts) is booming worldwide, exacerbating ongoing habitat fragmentation and degradation, and further fueling biodiversity loss. A systematic approach for selecting hydropower sites within river networks may help to minimize the detrimental effects of small hydropower on biodiversity. In addition, a better understanding of reach- and basin- scale impacts is key for designing planning tools. We synthesize the available information about (1) reach-scale and (2) basin-scale impacts of small hydro-power plants on biodiversity and ecosystem function, and (3) interactions with other anthropogenic stressors.
We then discuss state-of-the-art, spatially explicit planning tools and suggest how improved knowledge of the ecological and evolutionary impacts of hydropower can be incorporated into project development. Such tools can be used to balance the benefits of hydropower production with the maintenance of ecosystem services and biodiversity conservation. Adequate planning tools that consider basin-scale effects and interactions with other stressors, such as climate change, can maximize long-term conservation.

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