Population structure enhances perspectives on regional management of the western Indian Ocean green turtle

Abstract : To refine our understanding of the spatial structure of the green turtle (Chelonia mydas) populations in the South West Indian Ocean (SWIO), we analysed patterns of mitochondrial DNA (396 base pairs control region fragment) variation among 171 samples collected at five distinct locations (Kenya, Northern Mozambique, and three locations in the Republic of Seychelles: the Granitic, Amirantes, and Farquhar groups) and compared them to genetic data (n = 288), previously collected from 10 southern locations in the SWIO. We also analysed postnesting satellite tracks (n = 4) from green turtles nesting in the Amirantes group. Pairwise comparisons of haplotype frequencies showed significant genetic differentiation amongst rookeries and suggest that the SWIO hosts two main genetic stocks of nesting green turtles that could themselves be divided in two sub-stocks that still need to be confirmed: A. the Southern Mozambique Channel, that could be composed of two sub-stocks (a1) Europa and (a2) Juan de Nova, and B. the Northern SWIO (N-SWIO) comprising two sub-stocks (b1) the Seychelles archipelago stock—SEY; and (b2) the remaining Northern SWIO rookeries. The newly revealed differentiation of the Seychelles population is supported by restricted migration of females tracked from the Amirantes group suggesting relatively limited links with other regional stocks. We hypothesize that this differentiation could be due to local and regional current patterns and to the role of the Indo-Pacific Barrier as a genetic break, enhanced during periods of sea level decrease associated with a rare but continuous flow of hatchlings and young juveniles from Western Australia.
Type de document :
Article dans une revue
Conservation Genetics, Springer Verlag, 2015, 16 (5), pp.1069--1083. 〈10.1007/s10592-015-0723-3〉
Liste complète des métadonnées

Littérature citée [95 références]  Voir  Masquer  Télécharger

http://hal.univ-reunion.fr/hal-01306706
Contributeur : Réunion Univ <>
Soumis le : mardi 26 avril 2016 - 13:18:02
Dernière modification le : vendredi 14 septembre 2018 - 08:16:19
Document(s) archivé(s) le : mardi 15 novembre 2016 - 13:13:58

Fichier

Population structure enhances ...
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Jérôme Bourjea, Jeanne A. Mortimer, Julie Garnier, Gladys Okemwa, Brendan J. Godley, et al.. Population structure enhances perspectives on regional management of the western Indian Ocean green turtle. Conservation Genetics, Springer Verlag, 2015, 16 (5), pp.1069--1083. 〈10.1007/s10592-015-0723-3〉. 〈hal-01306706〉

Partager

Métriques

Consultations de la notice

229

Téléchargements de fichiers

167