Abstract
The polychaete Pectinaria koreni exhibits a complex life cycle characterized by non-overlapping generations and widespread larval dispersal. To explore how “local” metapopulation genetic structure varies spatially and temporally during population turnover, we combined observations on demography, larval dispersal through hydrodynamic modelling and population genetics of successive age cohorts in the Baie de Seine (eastern English Channel, France). Mature adults (March), newly settled (July) and later-stage juveniles (September) were sampled in 2003 on the edge and in the main demes of the metapopulation. Demes displayed an asynchronous dynamics due to variations in habitat quality affecting reproductive timing (e.g. three distinct spawning events observed) and in local larval supply linked to temporal fluctuations of hydrodynamism. Two-source populations were identified among dense areas with the greatest larval retention and self-recruitment rates: one with a single recruitment event, stable temporal genetic variation and a strong spatial genetic re-homogenization during turnover, and the other with two recruitment events and significant allele frequency changes over time. Sink habitats displayed single recruitment event and experienced strong inter-generational (juveniles vs adults) genetic changes due to genetic drift associated with strong winter mortalities. Altogether, results suggested that adult spawning asynchrony and sweepstakes reproductive success, together with genetic drift, played a greater role than hydrodynamics itself in determining effective recruitment rates at some sites and generating genetic patchiness.
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Acknowledgments
We are grateful to the crews of the RV “Côte d’Aquitaine” and RV “Côte de la Manche”. This work was co-financed by the “Programme National d’Environnement Côtier” and the “Institut Français pour la Biodiversité”, and MTJ acknowledges a grant from the Région Bretagne. Thanks to Nicolas Desroy for participation to cruises which enabled us to define areas of abundance for subsequent sampling in 2002, to the DEA 2003–2004 “Océanologie Biologique et Environnement Marin” for their help in measuring specimens and to the three anonymous referees for their constructive criticisms of the manuscript. Laboratory equipment was provided by the “Bettencourt-Schueller” Foundation and genotyping facilities by the “Plateforme Génopole Ouest” and “Génomer” based at the Station Biologique de Roscoff.
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Communicated by S. Uthicke.
Data accessibility: Original microsatellite data set is provided in DRYAD database, along with the corrected allele frequencies as an input file.
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Jolly, M.T., Thiébaut, E., Guyard, P. et al. Meso-scale hydrodynamic and reproductive asynchrony affects the source–sink metapopulation structure of the coastal polychaete Pectinaria koreni . Mar Biol 161, 367–382 (2014). https://doi.org/10.1007/s00227-013-2342-1
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DOI: https://doi.org/10.1007/s00227-013-2342-1