Phylogeography of the green turtle, Chelonia mydas, in the Southwest Indian Ocean

Type Article
Date 2007
Language English
Author(s) Bourjea JeromeORCID1, Lapegue Sylvie2, Gagnevin L3, Broderick D4, 5, Mortimer J.A.6, Ciccione S7, Roos DavidORCID1, Taquet Coralie1, Grizel Henri1
Affiliation(s) 1 : IFREMER, F-97822 Le Port, France.
2 : IFREMER, Lab Genet & Pathol, F-17390 La Tremblade, France.
3 : CIRAD, UMR Peuplements Vegetaux & Bioagresseurs Milieu T, St Pierre, Reunion.
4 : Univ Queensland, Sch Integrat Biol, Queensland Biosci Precint, St Lucia, Qld 4072, Australia.
5 : Univ Queensland, Dept Primary Ind & Fisheries, Queensland Biosci Precint, St Lucia, Qld 4072, Australia.
6 : Minist Environm & Nat Resources, Mahe, Seychelles.
7 : CEDTM, St Leu 97898, Reunion.
Source Molecular Ecology (0962-1083) (Blackwell science), 2007 , Vol. 16 , N. 1 , P. 175-186
DOI 10.1111/j.1365-294X.2006.03122.x
WOS© Times Cited 67
Keyword(s) Phylogeography, Mozambique Channel, Mitochondrial DNA, Indian Ocean, Control region, Chelonia mydas
Abstract Patterns of mitochondrial DNA (mtDNA) variation were used to analyse the population genetic structure of southwestern Indian Ocean green turtle (Chelonia mydas) populations. Analysis of sequence variation over 396 bp of the mtDNA control region revealed seven haplotypes among 288 individuals from 10 nesting sites in the Southwest Indian Ocean. This is the first time that Atlantic Ocean haplotypes have been recorded among any Indo-Pacific nesting populations. Previous studies indicated that the Cape of Good Hope was a major biogeographical barrier between the Atlantic and Indian Oceans because evidence for gene flow in the last 1.5 million years has yet to emerge. This study, by sampling localities adjacent to this barrier, demonstrates that recent gene flow has occurred from the Atlantic Ocean into the Indian Ocean via the Cape of Good Hope. We also found compelling genetic evidence that green turtles nesting at the rookeries of the South Mozambique Channel (SMC) and those nesting in the North Mozambique Channel (NMC) belong to separate genetic stocks. Furthermore, the SMC could be subdivided in two different genetic stocks, one in Europa and the other one in Juan de Nova. We suggest that this particular genetic pattern along the Mozambique Channel is attributable to a recent colonization from the Atlantic Ocean and is maintained by oceanic conditions in the northern and southern Mozambique Channel that influence early stages in the green turtle life cycle.
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