A New Barrier to Dispersal Trapped Old Genetic Clines That Escaped the Easter Microplate Tension Zone of the Pacific Vent Mussels
| Type | Article | ||||||||
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| Date | 2013-12 | ||||||||
| Language | English | ||||||||
| Author(s) | Plouviez Sophie1, 2, 3, Faure Baptiste1, 2, 4, 5, Le Guen Dominique1, 2, Lallier Francois1, 2, Bierne Nicolas4, 5, Jollivet Didier1, 2 | ||||||||
| Affiliation(s) | 1 : Univ Paris 06, Lab Adaptat & Diversite Milieu Marin, Stn Biol Roscoff, Roscoff, France. 2 : CNRS, UMR 7144, Stn Biol Roscoff, Roscoff, France. 3 : Duke Univ, Div Marine Sci & Conservat, Nicholas Sch Environm, Beaufort, NC USA. 4 : Univ Montpellier 2, Montpellier, France. 5 : Inst Sci Evolut, CNRS UMR 5554, Stn Mediterraneenne Environm Littoral, Sete, France. |
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| Source | Plos One (1932-6203) (Public Library Science), 2013-12 , Vol. 8 , N. 12 , P. e81555 | ||||||||
| DOI | 10.1371/journal.pone.0081555 | ||||||||
| WOS© Times Cited | 16 | ||||||||
| Abstract | Comparative phylogeography of deep-sea hydrothermal vent species has uncovered several genetic breaks between populations inhabiting northern and southern latitudes of the East Pacific Rise. However, the geographic width and position of genetic clines are variable among species. In this report, we further characterize the position and strength of barriers to gene flow between populations of the deep-sea vent mussel Bathymodiolus thermophilus. Eight allozyme loci and DNA sequences of four nuclear genes were added to previously published sequences of the cytochrome c oxidase subunit I gene. Our data confirm the presence of two barriers to gene flow, one located at the Easter Microplate (between 21 degrees 33'S and 31 degrees S) recently described as a hybrid zone, and the second positioned between 7 degrees 25'S and 14 degrees S with each affecting different loci. Coalescence analysis indicates a single vicariant event at the origin of divergence between clades for all nuclear loci, although the clines are now spatially discordant. We thus hypothesize that the Easter Microplate barrier has recently been relaxed after a long period of isolation and that some genetic clines have escaped the barrier and moved northward where they have subsequently been trapped by a reinforcing barrier to gene flow between 7 degrees 25'S and 14 degrees S. | ||||||||
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