Genetic characterization of Brycon hilarii (Characiformes) populations within the Pantanal: Aspects of their conservation within a globally important neotropical wetland
- Authors: Okazaki T.I.1, Hallerman E.M.2, de Resende E.K.3, Hilsdorf A.W.1
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Affiliations:
- University of Mogi das Cruzes
- Department of Fish and Wildlife Conservation
- EMBRAPA Pantanal
- Issue: Vol 57, No 3 (2017)
- Pages: 434-444
- Section: Article
- URL: https://journal-vniispk.ru/0032-9452/article/view/166966
- DOI: https://doi.org/10.1134/S0032945217030092
- ID: 166966
Cite item
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 DEST and FST-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.
About the authors
T. I. Okazaki
University of Mogi das Cruzes
Email: wagner@umc.br
Brazil, Mogi das Cruzes, SP, 08701-970
E. M. Hallerman
Department of Fish and Wildlife Conservation
Email: wagner@umc.br
United States, Blacksburg, VA, 24061-0321
E. K. de Resende
EMBRAPA Pantanal
Email: wagner@umc.br
Brazil, Corumbá, MS, 79320-900
A. W. S. Hilsdorf
University of Mogi das Cruzes
Author for correspondence.
Email: wagner@umc.br
Brazil, Mogi das Cruzes, SP, 08701-970
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