Gélin Pauline, Pirog A., Fauvelot Cécile, Magalon H. (2018). High genetic differentiation and low connectivity in the coral Pocillopora damicornis type beta at different spatial scales in the Southwestern Indian Ocean and the Tropical Southwestern Pacific. Marine Biology, 165 (10), p. art. 167 [14 p.]. ISSN 0025-3162.
Titre du document
High genetic differentiation and low connectivity in the coral Pocillopora damicornis type beta at different spatial scales in the Southwestern Indian Ocean and the Tropical Southwestern Pacific
Année de publication
2018
Auteurs
Gélin Pauline, Pirog A., Fauvelot Cécile, Magalon H.
Source
Marine Biology, 2018,
165 (10), p. art. 167 [14 p.] ISSN 0025-3162
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.
Plan de classement
Limnologie biologique / Océanographie biologique [034]
;
Ecologie, systèmes aquatiques [036]
Description Géographique
OCEAN INDIEN OUEST ; PACIFIQUE SUD OUEST ; MAYOTTE ; JUAN DE NOVA ; MADAGASCAR ; REUNION ; RODRIGUES ; NOUVELLE CALEDONIE ; CHESTERFIELD PLATEAU ; BAMPTON PLANTEAU ; BELLONA PLATEAU ; ZONE TROPICALE
Localisation
Fonds IRD [F B010074137]
Identifiant IRD
fdi:010074137
