Genetic structure of the sea-bob shrimp (Xiphopenaeus kroyeri Heller, 1862; Decapoda, Penaeidae) along the Brazilian southeastern coast

Abstract

The sea-bob shrimp, Xiphopenaeus kroyeri, is one of the most important economic marine resources along the entire Brazilian coast. Nevertheless, despite its economic importance, no studies have examined the population genetics of this species. In this paper, we used ten allozyme loci to study the pattern of genetic structuring in X. kroyeri along the southeastern Brazilian coast. Seven of the ten analyzed loci were polymorphic, yielding observed heterozygosity values higher than those reported for other penaeid shrimps. The population from São Paulo was significantly different from the other two populations (Rio de Janeiro and Espírito Santo), which, in turn, seem to form a single panmitic unit. Therefore, our results clearly indicate that conservation policies for this species should consider the São Paulo population as an independent stock from those of Rio de Janeiro and Espírito Santo.

The contribution of genetics in the study of the sea-bob shrimp populations from the brazilian coast

“…The presence of marked genetic differences among X. kroyeri populations from southeastern Brazil was later reported by VOLOCH and SOLÉ-CAVA (2005), who used ten allozyme loci for the investigation of genetic structuring patterns. Significant differences (FST = 0.223) were detected between the population from Ubatuba (SP) and the two populations from Nova Almeida and…”

“…From a total of fifteen loci analyzed, five diagnostic loci were observed in both Natal and Ubatuba populations, including the previously studied Ldh2 locus (VOLOCH and SOLÉ-CAVA, 2005). As a consequence, strong heterozygote deficiencies (FIS = 0.575; P<0.05) were also detected in the population of Ubatuba and also in Natal.…”

“…Cabo Frio, which formed a single panmitic unit (VOLOCH and SOLÉ-CAVA, 2005). The population from Ubatuba, however, presented significant departures from Hardy-Weinberg expectations in two loci, due to strong deficiencies in observed heterozygosities (for Ldh2: Ho = 0.0).…”

“…The geminal studies addressing the genetic characterization of the species X. kroyeri were published after 2000, adding important new information on the systematics of the genus, demonstrating the presence of cryptic species in the Atlantic and outlining the geographical distribution and the levels of genetic diversity and population structuring of Brazilian populations (GUSMÃO and SOLÉ-CAVA, 2002;VOLOCH and SOLÉ-CAVA, 2005;GUSMÃO et al, 2006). The population boundaries were assessed based on allozyme markers, which are known to be less variable than other molecular markers currently used in shrimp genetic studies, such as the mitochondrial genes COI, CYTB and D-loop region, or microsatellites (HUNTER et al, 2008;NAHAVANDI et al, 2011;DUMONT et al, 2009).…”

Biologia reprodutiva do camarão sete-barbas no litoral centro sul e sul do Espírito Santo, Brasil

“…As informações existentes atestam a grande variabilidade genética (GUSMÃO et al, 2006;VOLOCH e SOLE-CAVA, 2005), na proporção entre machos e fêmeas e na periodicidade do recrutamento, as quais podem ocorrer entre duas áreas relativamente próximas entre si (MOTA-ALVES e RODRIGUES, 1977; NAKAGAKI e NEGREIROS- FRANSOZO, 1998;BRANCO, 2005;CASTRO et al, 2005). Essa variabilidade indica que o processo de gestão do recurso, que atualmente ocorre em grandes setores da costa brasileira, pode não atingir os objetivos de garantir a sua sustentabilidade e ressaltam a importância da realização de pesquisas regionais da pesca e biologia da espécie.…”