Publications des scientifiques de l'IRD

Gélin Pauline, Fauvelot Cécile, Bigot L., Baly Joseph, Magalon H. (2018). From population connectivity to the art of striping Russian dolls : the lessons from Pocillopora corals. Ecology and Evolution, 8 (2), p. 1411-1426. ISSN 2045-7758.

Titre du document
From population connectivity to the art of striping Russian dolls : the lessons from Pocillopora corals
Année de publication
2018
Type de document
Article référencé dans le Web of Science WOS:000425822800051
Auteurs
Gélin Pauline, Fauvelot Cécile, Bigot L., Baly Joseph, Magalon H.
Source
Ecology and Evolution, 2018, 8 (2), p. 1411-1426 ISSN 2045-7758
Here, we examined the genetic variability in the coral genus Pocillopora, in particular within the Primary Species Hypothesis PSH09, identified by Gelin, Postaire, Fauvelot and Magalon (2017) using species delimitation methods [also named Pocillopora eydouxi/meandrina complex sensu, Schmidt-Roach, Miller, Lundgren, & Andreakis (2014)] and which was found to split into three secondary species hypotheses (SSH09a, SSH09b, and SSH09c) according to assignment tests using multi-locus genotypes (13 microsatellites). From a large sampling (2,507 colonies) achieved in three marine provinces [Western Indian Ocean (WIO), Tropical Southwestern Pacific (TSP), and Southeast Polynesia (SEP)], genetic structuring analysis conducted with two clustering analyses (Structure and DAPC) using 13 microsatellites revealed that SSH09a was restricted to the WIO while SSH09b and SSH09c were almost exclusively in the TSP and SEP. More surprisingly, each SSH split into two to three genetically differentiated clusters, found in sympatry at the reef scale, leading to a pattern of nested hierarchical levels (PSH>SSH>cluster), each level hiding highly differentiated genetic groups. Thus, rather than structured populations within a single species, these three SSHs, and even the eight clusters, likely represent distinct genetic lineages engaged in a speciation process or real species. The issue is now to understand which hierarchical level (SSH, cluster, or even below) corresponds to the species one. Several hypotheses are discussed on the processes leading to this pattern of mixed clusters in sympatry, evoking formation of reproductive barriers, either by allopatric speciation or habitat selection.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Limnologie biologique / Océanographie biologique [034]
Description Géographique
OCEAN INDIEN ; PACIFIQUE ; POLYNESIE ; ZONE TROPICALE
Localisation
Fonds IRD [F B010072408]
Identifiant IRD
fdi:010072408
Contact