Abstract
The large catfish Pseudoplatystoma punctifer plays an important role as a top predator in the Amazonian Basin ecosystem. The Madeira River is the largest tributary of the Amazon River marked by a series of rapids and waterfalls. Between 2011 and 2012 some of the rapids were submerged by two hydroelectric dams. Upstream and downstream of the rapids are two sub-basins Mamoré/Guaporé and lower Madeira, respectively. Using mitochondrial and microsatellite markers, we estimated genetic diversity, genetic differentiation, and gene flow between sub-basins and tested if the rapids functioned as barriers limiting the gene flow for this species of catfish. We identified three population clusters, one representing the individuals from the Mamoré/Guaporé sub-basin (upstream) and the other two representing the individuals from the lower Madeira sub-basin (downstream). The rapids restricted but did not block gene flow, which corroborates a clinal pattern of genetic differentiation.
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Acknowledgements
This study was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (stand rate from ASCM) and Fundação de Amparo a Pesquisa do estado do Amazonas (FAPEAM) J. S. B. Protocolo 8058.UNI300.276.08112012. IBAMA granted the Permissions (N8 s 130 and 14278-1) and SISBIO (solicitation Nº 50486). We would also like to thank Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and CNPq (Process: 141556/20170) for the scholarship granted to A. S. C. M. during study this study. This work is a part of ASCM PhD thesis in the Genetics, Conservation in Evolutionary Biology program of INPA. In memory of Fabíola Almeida Marques.
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Cunha-Machado, A.S., Farias, I.P., Hrbek, T. et al. Genetic differentiation and gene flow of the Amazonian catfish Pseudoplatystoma punctifer across the Madeira River rapids prior to the construction of hydroelectric dams. Hydrobiologia 849, 29–46 (2022). https://doi.org/10.1007/s10750-021-04705-8
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DOI: https://doi.org/10.1007/s10750-021-04705-8