Phylogeography and genetic population structure of Caribbean sharpnose shark <Emphasis Type="Italic">Rhizoprionodon porosus</Emphasis> |
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Authors: | Fernando F Mendonça Claudio Oliveira Otto B F Gadig Fausto Foresti |
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Institution: | 1.Laboratório de Biologia e Genética de Peixes, Departamento de Morfologia,Instituto de Biociências de Botucatu, Universidade Estadual Paulista—UNESP,Botucatu,Brazil;2.Laboratório de Pesquisa em Elasmobranquios, Campus Experimental do Litoral Paulista,Universidade Estadual Paulista—UNESP,S?o Vicente,Brazil |
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Abstract: | Sharks of the genus Rhizoprionodon are among the most important predators along the coastal marine ecosystems, and they represent an important economic resource
for the small-scale fisheries. To properly manage and conserve exploited shark species, detailed analyses of their population
structure are needed. To evaluate the gene flow and levels of the genetic diversity among populations of the Caribbean sharpnose
shark R. porosus, we identified the nucleotide sequence based on collections (n = 321 specimens) from 10 different areas, including the Caribbean
Sea and several locations along the entire Brazilian coast. The analysis of 802 nucleotides from the mitochondrial DNA control
region revealed 53 distinct haplotypes. The majority of these haplotypes were restricted to their collection locales with
a significant genetic structure detected among the overall populations (Φ
ST = 0.237, P < 0.0001). The data suggest a population division with two distinct management units in the western Atlantic. These management
units are likely separated by the Equatorial Current. The strong population structure in R. porosus indicates that regional populations, if depleted, will not recover swiftly through immigration. |
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