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Genetic characterization of Brycon hilarii (Characiformes) populations within the Pantanal: Aspects of their conservation within a globally important neotropical wetland

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Abstract

Brycon hilarii, a characid species endemic to the Upper Paraguay hydrographic basin, is important to regional artisanal and sports fisheries. To develop effective strategies for conservation of this species in the face of potential environmental changes in the Pantanal region, we characterized genetic structuring within and among six B. hilarii collections based on variation at five microsatellite DNA markers. Within-population genetic variability was high, with 75 different alleles; mean average allelic richness per locus per sample location ranged from 6.06 to 7.99. Nei’s gene diversity (hs) varied among drainages from 0.66 (±0.2) to 0.69 (±0.2), with an average across the four genetically identified populations of 0.68 (±0.02). Analyses of Jost’s D EST and F ST-like indices, AMOVA, and Structure-based clustering analyses indicated that B. hilarii populations exhibit a low level of genetic structure, with some indications that the Taquari River population is somewhat distinct from others. Results of K-means analysis suggested little or no structuring, with weakly differentiated populations above and below the confluence of the Paraguay and Taquari rivers. Because B. hilarii populations in the Pantanal are linked by high levels of gene flow, habitat alterations that would interfere with gene flow may jeopardize the long-term persistance of the species.

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Authors and Affiliations

  1. University of Mogi das Cruzes, Unit of Biotechnology, P.O. Box 411, 08701-970, Mogi das Cruzes, SP, Brasil

    T. I. Okazaki & A. W. S. Hilsdorf

  2. Department of Fish and Wildlife Conservation, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061-0321, USA

    E. M. Hallerman

  3. EMBRAPA Pantanal, Caixa Postal 109, 79320-900, Corumbá, MS, Brazil

    E. K. de Resende

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  1. T. I. Okazaki
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  2. E. M. Hallerman
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  3. E. K. de Resende
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  4. A. W. S. Hilsdorf
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Okazaki, T.I., Hallerman, E.M., de Resende, E.K. et al. Genetic characterization of Brycon hilarii (Characiformes) populations within the Pantanal: Aspects of their conservation within a globally important neotropical wetland. J. Ichthyol. 57, 434–444 (2017). https://doi.org/10.1134/S0032945217030092

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