Mixed stock analysis of a resident green turtle, Chelonia mydas, population in New Caledonia links rookeries in the South Pacific
Tyffen C. Read A B J , Nancy N. FitzSimmons C , Laurent Wantiez D , Michael P. Jensen E , Florent Keller A , Olivier Chateau A , Richard Farman A , Jonathan Werry B F , Kenneth T. MacKay G , George Petro H and Colin J. Limpus I
+ Author Affiliations
- Author Affiliations
A Laboratory of Marine Biology and Ecology, Aquarium des Lagons, Noumea 98807, New Caledonia.
B Griffith Centre for Coastal Management, Griffith University, Griffith, Qld 4222, Australia.
C Environmental Futures Centre, Griffith University, Griffith, Qld 4222, Australia.
D EA4243 LIVE, Université de la Nouvelle-Calédonie, Noumea 98807, New Caledonia.
E Marine Mammal and Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 8901 La Jolla Shores Dr., La Jolla, CA 92037, USA.
F Ocean and Coast Research, Main Beach, Qld 4217, Australia.
G Vonu Environmental Consulting, Victoria, BC 250, Canada.
H Wan Smolbag Theatre, Port Vila, Vanuatu.
I Aquatic Threatened Species Unit, Department of Environment and Heritage Protection, Queensland Government, Qld 4001, Australia.
J Corresponding author. Email: tyffen.read@aquarium.nc
Wildlife Research 42(6) 488-499 https://doi.org/10.1071/WR15064
Submitted: 27 March 2015 Accepted: 5 August 2015 Published: 19 October 2015
Abstract
Context: Migratory species are known to pose a challenge for conservation because it is essential to understand their complex life history in order to implement efficient conservation actions.
Aims: In New Caledonia, large seagrass habitats in the Grand Lagon Sud (GLS) are home to resident green turtles (Chelonia mydas) of unknown origins. To assess the stock composition in the GLS, 164 foraging turtles were sampled for genetic analysis of ~770 base pairs of the mitochondrial DNA (mtDNA) control region.
Methods: Foraging turtles ranging in size from 48.0 to 108.4 cm curved carapace length were captured at five different sites within the GLS between September 2012 and December 2013. To provide baseline data for mixed stock analysis, published data from rookeries were used in addition to 105 samples collected at rookeries in the d’Entrecasteaux Islands and Chesterfield Islands in New Caledonia and at Malekula Island in Vanuatu. Exact tests of population differentiation and pairwise FST estimates were used to test for differences in mtDNA haplotype frequencies.
Key results: These analyses indicated that rookeries in the d’Entrecasteaux Islands and Vanuatu form unique management units and that the Chesterfield Islands rookeries are linked to the Coral Sea management unit. Mixed stock analysis indicated the highest proportion (mean = 0.63) of foraging turtles originate from the d’Entrecasteaux stock.
Conclusions: The larger contribution is estimated to be from a large rookery from New Caledonia, but smaller contributions are suggested from other rookeries in the South Pacific.
Implications: Marine conservation policies in New Caledonia need to consider the links between the foraging and nesting populations of C. mydas in New Caledonia and other rookeries and foraging grounds in the Coral Sea.
Additional keywords: Cheloniidae, management unit, marine conservation, marine migratory species, mtDNA, sea turtle.
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