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Water diversion in Brazil threatens biodiversity

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Abstract

Construction of water diversions is a common response to the increasing demands for freshwater, often resulting in benefits to communities but with the risk of multiple environmental, economic, and social impacts. Water-diversion projects can favor massive introductions and accelerate biotic homogenization. This study provides empirical evidence on the consequences of a proposed law intended to divert water from two large and historically isolated river basins in Brazil: Tocantins to São Francisco. Compositional similarity (CS) and β-diversity were quantified encompassing aquatic organisms: mollusks, zooplankton, crustaceans, insects, fishes, amphibians, reptiles, mammals, and plants. For CS we (i) considered only native species, and (ii) simulated the introduction of non-natives and assumed the extinction of threatened species due to this water-diversion project. We highlight the environmental risks of such large-scale projects, which are expected to cause impacts on biodiversity linked to bioinvasion and homogenization, and we recommend alternatives in order to solve water-demand conflicts.

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Acknowledgements

We are very grateful to Dr. Luiz Ricardo Lopes de Simone (University of São Paulo Museum of Zoology, MZSP) for providing data from the Mollusca Collection, and Dr. Edson Gomes de Moura Júnior (Federal University of São Francisco Valley - UNIVASF) for providing data from aquatic plants of the São Francisco River Basin. We thank Dr. Neusa Hamada (National Institute for Research in Amazonia - INPA) for valuable comments and revision of the aquatic-insect data. We also would like to thank Dr. Daniel Simberloff (Department of Ecology and Evolutionary Biology, University of Tennessee) for important comments on the manuscript, and Dr. James A. Nienow (Biology Department, Valdosta State University) and Dr. Larissa Strictar Pereira (Federal University of Paraná) for English revision. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES - Brazil - Finance Code 001), provided to V.M.A.S. and L.R.P.P. The authors are grateful to Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq - Brazil) for the continuous research productivity grants provided to J.R.S.V. (Process Numbers: 302367/2018-7 and 303776/2015-3), and for support provided to V.S.D. (Process Number: 167382/2017-9), A.M.C.R. (Process Number: 141028/2016-5), P.M.F. and J.E.

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Daga, V.S., Azevedo-Santos, V.M., Pelicice, F.M. et al. Water diversion in Brazil threatens biodiversity. Ambio 49, 165–172 (2020). https://doi.org/10.1007/s13280-019-01189-8

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