Genetic composition, population structure and phylogeography of the loggerhead sea turtle: colonization hypothesis for the Brazilian rookeries

被引：0
作者：
E. C. Reis
L. S. Soares
S. M. Vargas
F. R. Santos
R. J. Young
K. A. Bjorndal
A. B. Bolten
G. Lôbo-Hajdu
机构：
[1] Universidade do Estado do Rio de Janeiro,Departamento de Genética
[2] Projeto TAMAR-ICMBio,Fundação Centro Brasileiro de Proteção e Pesquisa das Tartarugas Marinhas
[3] Universidade Federal de Minas Gerais,Departamento de Biologia Geral
[4] Pontifícia Universidade Católica de Minas Gerais,Departamento de Ciências Biológicas
[5] University of Florida,Archie Carr Center for Sea Turtle Research and Department of Biology
来源：
Conservation Genetics | 2010年 / 11卷
关键词：
Conservation genetics; Mitochondrial DNA; Population structure; Phylogeography; Mixed stock analysis;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The loggerhead sea turtle, Caretta caretta, is the most common species of sea turtle nesting in Brazil and is listed as endangered by the IUCN. Our study characterizes the genetic structure of loggerheads in Brazil based on mitochondrial DNA control region variability and presents a hypothesis for the colonization of Brazilian rookeries. We analyzed 329 samples from Brazilian rookeries and an oceanic foraging ground, and we compared our results with previously published data for other loggerhead populations. Brazilian rookeries had four haplotypes, none of which have been reported for rookeries outside Brazil. Six haplotypes were found in the foraging aggregation. The presence of the CC-A4 haplotype at all sampled sites and the low nucleotide diversity suggest a common origin for all rookeries, with CC-A4 being the ancestral haplotype of the Brazilian populations. The occurrence of three haplotypes in the foraging aggregation that are known only from rookeries outside of Brazil is consistent with the transoceanic migratory behavior of loggerheads. Our results indicated that the colonization of Brazilian rookeries probably occurred from the southern USA stock. This recent colonization most likely followed a north to south route along the Brazilian coastline, influenced by the Brazilian warm current. Our results further suggest the existence of two genetic population units of loggerheads in Brazil and corroborate natal homing behavior in loggerheads.
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页码：1467 / 1477
页数：10
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