Journal Title
Title of Journal: Marine Biology
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Abbravation: Marine Biology
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Publisher
Springer-Verlag
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Authors: JD Durand A Collet S Chow B Guinand P Borsa
Publish Date: 2005/03/03
Volume: 147, Issue: 2, Pages: 313-322
Abstract
A sharp genetic break separates Atlantic from IndoPacific bigeye tuna Thunnus obesus populations as the frequencies of two major mitochondrial mt DNA types α and β found in this species are different across the tip of southern Africa The level of nucleotide divergence between mtDNA types α and β is of the same order as that between reproductively isolated taxa To further investigate the genetic structure of bigeye tuna over its distribution range and in the contact zone off southern Africa bigeye tuna samples collected between 1992 and 2001 including samples from a previous mtDNA survey were characterized for four nuclear DNA loci and for mtDNA Nuclear markers did not support the hypothesis that α and β mitochondria characterize sibling species Significant allelefrequency differences at one intronic locus GH2 and one microsatellite locus µ208 were found between Atlantic and IndoPacific samples although the level of nuclear genetic differentiation Weir and Cockerham’s ifmmodeexpandafterhatelseexpandafterfitheta =0025 to 0042 was much lower than in mtDNA ifmmodeexpandafterhatelseexpandafterfitheta =0664 to 0807 Probabilistic Bayesian assignment of individuals to a population confirmed that southern African bigeye tuna samples represent a simple mixture of individuals from Atlantic and Indian stocks that do not interbreed with a higher contribution from Indian Ocean individuals about 2/3 vs 1/3We are grateful to JP Hallier F Ménard M Potier IRD UR 109 Sète RD Ward CSIRO Marine Research Hobart and the crews and research staff of the National Research Institute of Far Seas Fisheries Shimizu for providing samples M Pascal for help in laboratory analysis F Bonhomme CNRS UMR 5000/IFREMER URM 16 Sète for providing laboratory facilities and for support L Bach Aarhus Universitet Denmark and A Topchy Michigan State University East Lansing for help with assignment test methodologies KM Schaefer IATTC La Jolla and K Holland CSIRO for information about tunas’ biology and M Villanueva for helpful comments Funded by IRD UR 070 UR 081 IFREMER URM 16 and CNRS UMR 5000
Keywords:
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