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An unprecedented time-series study in the basin of the Tapajós River, a major tributary of the Amazon, assesses the level of degradation of small rivers threatened by agribusiness expansion.
A small hydropower dam in Brazil.Victor Baptista The development of small hydropower dams is widespread throughout Brazil and elsewhere in the world, vastly overshadowing large hydropower projects. The proliferation of these smaller dams is a response to growing energy and security needs. Their expansion, however, threatens many of the remaining free-flowing rivers and biodiverse tropical regions of the world— interrupting the migrations of freshwater fishes, on which millions of peoples’ livelihoods depend. A new University of Washington paper published Jan. 11 in Nature Sustainability q...