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Hidden diversity and endemism on seamounts: focus on poorly dispersive neogastropods

Authors

  • MAGALIE CASTELIN,

    Corresponding author
    1. ‘Systématique, Adaptation et Evolution’, UMR 7138, UPMC-IRD-MNHN-CNRS (UR IRD 148), Muséum National d'Histoire Naturelle, Département Systématique et Evolution, CP 26, 57 Rue Cuvier, F-75231 Paris Cedex 05, France
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  • JOSIE LAMBOURDIERE,

    1. Service de systématique moléculaire (CNRS-MNHN, UMS2700), Muséum National d'Histoire Naturelle, Département Systématique et Evolution, CP 26, 57 Rue Cuvier, F-75231 Paris Cedex 05, France
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  • MARIE-CATHERINE BOISSELIER,

    1. ‘Systématique, Adaptation et Evolution’, UMR 7138, UPMC-IRD-MNHN-CNRS (UR IRD 148), Muséum National d'Histoire Naturelle, Département Systématique et Evolution, CP 26, 57 Rue Cuvier, F-75231 Paris Cedex 05, France
    2. Service de systématique moléculaire (CNRS-MNHN, UMS2700), Muséum National d'Histoire Naturelle, Département Systématique et Evolution, CP 26, 57 Rue Cuvier, F-75231 Paris Cedex 05, France
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  • PIERRE LOZOUET,

    1. Direction des collections, 55 rue Buffon, CP 51, F-75231 Paris Cedex 05, France
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  • ARNAUD COULOUX,

    1. GENOSCOPE, Centre National de Séquençage, 2 rue Gaston Crémieux, CP 5706, F-91057 Evry Cedex, France
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  • CORINNE CRUAUD,

    1. GENOSCOPE, Centre National de Séquençage, 2 rue Gaston Crémieux, CP 5706, F-91057 Evry Cedex, France
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  • SARAH SAMADI

    1. ‘Systématique, Adaptation et Evolution’, UMR 7138, UPMC-IRD-MNHN-CNRS (UR IRD 148), Muséum National d'Histoire Naturelle, Département Systématique et Evolution, CP 26, 57 Rue Cuvier, F-75231 Paris Cedex 05, France
    2. Service de systématique moléculaire (CNRS-MNHN, UMS2700), Muséum National d'Histoire Naturelle, Département Systématique et Evolution, CP 26, 57 Rue Cuvier, F-75231 Paris Cedex 05, France
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E-mail: magcastelin@mnhn.fr

Abstract

The seamounts chain offers a set of fragmented habitats in which species with poor dispersive ability may undergo divergence in allopatry. Such a scenario may explain the endemism often described on seamounts. In gastropods, it is possible to infer the mode of development of a species from the morphology of its larval shell. Accordingly, we examine the population genetics of several caenogastropods from the Norfolk and Lord Howe seamounts (south-west Pacific) with contrasting modes of larval development. A prerequisite to our study was to clarify the taxonomic framework. The species delimitation was ruled using an integrative approach, based on both morphological and molecular evidence. Molecular data indicate an unexpected taxonomic diversity within the existing species names. Both the clarification of the taxonomic framework and the importance of the sampling effort allow us to confidently detect cryptic diversity and micro-endemism. These results are discussed in relation to the dispersive capacities of the organisms. © 2010 The Linnean Society of London, Biological Journal of the Linnean Society, 2010, 100, 420–438.

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