But a few years into the study, a small run-of-river diversion hydropower plant with a weir was added to the steep, glacier-fed, fast-flowing stream they were monitoring. They used the opportunity to make a before-and-after comparison of the plant's impact on benthic macroinvertebrates – small aquatic animals such as stonefly larvae that live in waterbodies, and are commonly used as indicators of their ecological condition. They expected the plant to have a significant impact on the macroinvertebrates – but those expectations were not confirmed.

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