"One really important point is that there are no fish in this particular part of the river," says Roberta Bottarin, a limnologist and the vice head of the Institute for Alpine Environment at Eurac, who co-authored the study. "If there had been fish, we would probably have had very different results." In her view, other factors, including the relatively large amount of water left in the original stream, may also have helped buffer the impact of the plant.

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