Genetic population structure of the swimming crab Callinectes danae (Crustacea: Decapoda) in southern Brazil

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• 作者：Weber ; L. I. ; Levy ; J. A.
• 关键词：Portunidae ; population genetics ; gene flow ; allozymes ; estuarine retention
• 刊名：Hydrobiologia
• 出版年：2000
• 出版时间：2000
• 年：2000
• 卷：420
• 期：1
• 页码：203-210
• 全文大小：87 KB

文摘

The population genetic structure of the swimming crab Callinectes danae (Crustacea, Portunidae) was studied by allozyme electrophoresis along the southern coast of Brazil (Santa Catarina and Rio Grande do Sul States). The biology of C. danae is poorly known, but some studies suggest that this species depends on estuaries for reproduction and for completing its life cycle, using them as recruitment sites and nursery grounds. If estuarine retention is an important process acting in favour of the recruitment of local populations, we should expect restriction of gene flow among populations inhabiting different estuaries. Therefore, our aim was to establish whether gene flow between populations of C. danae from different estuaries was restricted. Samples were collected in four estuaries: São Francisco do Sul, Laguna (Santa Catarina), Patos Lagoon and Chuí Stream (Rio Grande do Sul). Eleven loci were resolved. Contingency table tests (χ$^2$ and G) showed significant differences (P≤0.05) between pair-wise subpopulation comparisons. The estimated F$\_ST$ was &thetas;=0.065±0.019, suggesting a moderate structuring of C. danae populations. No relationship was found for the number of migrants between pairs of subpopulations and the geographic distance separating them (P= 0.292; r$^2$