Abstract
Catfishes of the genus Pseudoplatystoma are very important species due to both their high commercial value and their ecological role as voracious predators. They undertake lengthy migratory movements during their life-cycle, this including reproductive migration which occurs from October to December in the rainy season. In the present study, seven microsatellite loci were analyzed to access genetic variability in two samples of P. reticulatum from the Upper Paraguay Basin. The loci were highly polymorphic (mean = 7.28). According to all analysis, the two samples of P. reticulatum revealed pronounced genetic differentiation. Fst value was 0.2290, Rst value 0.1067 and AMOVA 22.90% (Fst ) and 10.67% (Rst ), all being highly significant (p < 0.001). The division of the fishes into two groups was confirmed by microsatellite multi-locus Bayesian assignment testing. The results obtained present evidence of genetic structuring in a P. reticulatum population.
Highlights
Catfishes of the genus Pseudoplatystoma belong to the family Pimelodidae, the 93 species of which occurring in the major river basins of South America (Ferraris, 2007)
The Pantanal area is located at the Upper Paraguay River Basin, with a drainage basin extending from the border between Brazil and Paraguay up to the limits of the Amazon River Basin, and covering about 140,000 km2 (Vila da Silva, 1995)
We analyzed two natural populations of Pseudoplatystoma reticulatum (“cachara”) collected in the Upper Paraguay River Basin, by using seven microsatellite loci originally developed for P. corruscans to access the genetic diversity of these samples
Summary
Marcia Matos de Abreu, Luiz Henrique Garcia Pereira, Vilma Barretto Vila, Fausto Foresti and Claudio Oliveira3 1Departamento de Ciências Ambientais, Universidade do Estado de Mato Grosso, Cáceres, MT, Brazil.
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