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

Autor: Jeanne A. Mortimer, Jerome Bourjea, Stéphane Ciccione, Mayeul Dalleau, Julie Garnier, George Hughes, Claire Jean, Brendan J. Godley, Gladys M. Okemwa, Delphine Muths
Přispěvatelé: Laboratoire d'Ecologie Marine (ECOMAR), Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Ecologie marine tropicale dans les Océans Pacifique et Indien (ENTROPIE [Réunion]), Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut de Recherche pour le Développement (IRD), Délégation de La Réunion, Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Department of Biology [Gainesville] (UF|Biology), University of Florida [Gainesville] (UF), The Zoological Society of London, Institute of Zoology, Kenya Marine and Fisheries Research Institute - KMFRI (KENYA), Kenya Sea Turtle Conservation Committee (KESCOM), Centre for Ecology and Conservation, University of Exeter, Chercheur indépendant, Kélonia - Observatoire des tortues marines, Institut de Recherche pour le Développement (IRD)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: Conservation Genetics
Conservation Genetics, Springer Verlag, 2015, 16 (5), pp.1069--1083. ⟨10.1007/s10592-015-0723-3⟩
Conservation Genetics, 2015, 16 (5), pp.1069--1083. ⟨10.1007/s10592-015-0723-3⟩
Conservation Genetics (1566-0621) (Springer), 2015-10, Vol. 16, N. 5, P. 1069-1083
ISSN: 1566-0621
1572-9737
DOI: 10.1007/s10592-015-0723-3⟩
Popis: International audience; 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.
Databáze: OpenAIRE
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