Aquatic species decline at dams and weirs documented

Dams and weirs have a stronger impact on watercourse ecosystems than was previously realized. Species diversity in the dammed area upstream of weirs shows a significant decline: one-quarter lower on average among fish, up to 50 percent lower among invertebrates. Scientists have demonstrated this through a survey of five rivers. Theirs is the first such analysis to consider both abiotic and biotic factors.

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