Gélin Pauline auteur aut IRD Pirog A. auteur aut IRD Fauvelot Cécile auteur aut IRD Magalon H. auteur aut IRD text journalArticle eng text/pdf born digital access Studying genetic connectivity in marine populations aims to understand the dispersal of an organism through the seascape and thus its gene flow. Here, we focused on one lineage of the recently revised coral Pocillopora damicornis complex, P. damicornis type beta, corresponding to Primary Species Hypothesis PSH05 in Gelin et al. (Mol Ecol 19:430-446, 2017b): it had been hypothesized that P. damicornis type beta encompasses four distinct lineages, representing Secondary Species Hypotheses (SSH05a, SSH05b, SSH05c and SSH05d). The aim of the present study was to confirm this partition and to infer the genetic structuring and connectivity among 27 populations for this widespread and common scleractinian. For this, a total of 1418 colonies were hierarchically sampled from two marine provinces of the southern parts of its distribution range, which remain largely understudied: the Western Indian Ocean and the Tropical Southwestern Pacific. Using 13 microsatellite loci and assignment tests, our findings confirmed the partition into four SSHs, each SSH splitting into clusters, suggesting that P. damicornis beta type may represent a complex of cryptic species. Moreover, within each SSH, clonal propagation was evidenced in almost every population, but clonal dispersal was mostly restricted to sampling site (except in Reunion Island and northern Madagascar, where clones were found in several populations approximately 50 km apart). Nevertheless, wherever the cursor of species level is placed (one or several species), populations were highly differentiated both within the Western Indian Ocean and the Tropical Southwestern Pacific, suggesting restricted gene flow at different spatial scales (marine province, ecoregions, islands/regions), leading to diverging lineages. specialized OCEAN INDIEN OUEST PACIFIQUE SUD OUEST MAYOTTE JUAN DE NOVA MADAGASCAR REUNION RODRIGUES NOUVELLE CALEDONIE CHESTERFIELD PLATEAU BAMPTON PLANTEAU BELLONA PLATEAU ZONE TROPICALE 034 036 165 10 art. 167 [14 p.] 2018 0025-3162 https://www.documentation.ird.fr/hor/fdi:010074137 10.1007/s00227-018-3428-6 0025-3162 [F B010074137] https://www.documentation.ird.fr/hor/fdi:010074137 https://www.documentation.ird.fr/intranet/publi/2018/10/010074137.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2018-11-07 2023-07-11 fdi:010074137 fre