Caracterização genética populacional do camarão sete-barbas Xiphopenaeus kroyeri (Heller, 1862) no litoral sudeste-sul do Brasil




Xiphopenaeus kroyeri, also known as the sea bob, is one of the most important fishery resources along the southeastern-southern coast of Brazil. However, its capture is beyond sustainable limits. Population structure analysis provides important information for the delineation of management and conservation programs. The genetic structure of the X. kroyeri population along the southeastern-southern coast of Brazil was analyzed using four micro-satellite loci. Median genetic variability was found; observed heterozygosity ranged from 0.029 to 0.735; the mean number of alleles per locus was of 6.8, ranging from 02 to 18. The samples from Guarapari (ES), Macaé (RJ), Angra dos Reis (RJ), Ubatuba (SP), Cananéia (SP), São Francisco do Sul (SC) and Itajaí (SC had low Fst values (-0.012 to 0.022). This result is in contrast with previous surveys conducted using enzyme analyses, which detected differentiation between samples collected above and below the Cabo Frio region, where upwelling occurs. However, Bayesian analysis performed in the present study revealed the existence of at least two genetic populations coexisting within the range sampled. These populations may be representative of the two annual reproduction peaks for X. kroyeri. Further studies on the genetic structure of this species are needed; such data would be extremely important to the development of sustainable management programs for X. kroyeri.


microssatélites genética da conservação pesca genética camarão xiphopenaeus kroyeri genetica

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