English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/115787
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Citado 40 veces en Web of Knowledge®  |  Pub MebCentral Ver citas en PubMed Central  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título

Genetic diversity and historical demography of Atlantic bigeye tuna (Thunnus obesus)

Autor Martínez, Pilar; González, Elena G. ; Castilho, Rita; Zardoya, Rafael
Palabras clave Population genetics
Mitochondrial control region
Bigeye tuna
Demography
Fecha de publicación 2006
EditorElsevier
Citación Molecular Phylogenetics and Evolution 39(2): 404-416 (2006)
ResumenBigeye (Thunnus obesus) is a large, pelagic, and migratory species of tuna that inhabits tropical and temperate marine waters worldwide. Previous studies based on mitochondrial RFLP data have shown that bigeye tunas from the Atlantic Ocean are the most interesting from a genetic point of view. Two highly divergent mitochondrial haplotype clades (I and II) coexist in the Atlantic Ocean. One is almost exclusive of the Atlantic Ocean whereas the other is also found in the Indo-Pacific Ocean. Bigeye tuna from the Atlantic Ocean is currently managed as a single stock, although this assumption remains untested at the genetic level. Therefore, genetic diversity was determined at the mitochondrial control region to test the null hypothesis of no population structure in bigeye tuna from the Atlantic Ocean. A total of 331 specimens were sampled from four locations in the Atlantic Ocean (Canada, Azores, Canary Islands, and Gulf of Guinea), and one in the Indian and Pacific Oceans, respectively. The reconstructed neighbor-joining phylogeny conWrmed the presence of Clades I and II throughout the Atlantic Ocean. No apparent latitudinal gradient of the proportions of both clades in the diVerent collection sites was observed. Hierarchical AMOVA tests and pairwise ST comparisons involving Atlantic Ocean Clades I and II were consistent with a single stock of bigeye tuna in the Atlantic Ocean. Population genetic analyses considering phylogroups independently supported gene flow within Clade II throughout the Atlantic Ocean, and within Clade I between Atlantic and Indo-Pacific Oceans. The latter result suggests present uni-directional gene flow from the Indo-Pacific into the Atlantic Ocean. Moreover, mismatch analyses dated divergence of Clades I and II during the Pleistocene, as previously proposed. In addition, migration rates were estimated using coalescent methods, and showed a net migration from Atlantic Ocean feeding grounds towards the Gulf of Guinea, the best-known spawning ground of Atlantic bigeye tuna.
Versión del editorhttp://dx.doi.org/10.1016/j.ympev.2005.07.022
URI http://hdl.handle.net/10261/115787
DOI10.1016/j.ympev.2005.07.022
ISSN1055-7903
Aparece en las colecciones: (MNCN) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Gonzalez Mol Phylogenetics 2006 Thunnus POSTPRINT.pdf2,04 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 



NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.