Genetic Connectivity Patterns of CoralsPocillopora damicornisandPorites panamensis(Anthozoa: Scleractinia) Along the West Coast of Mexico

Abstract

Abstract: Genetic connectivity was studied in two scleractinian corals, Pocillopora damicornis (branching and broadcast spawner) and Pontes panamensis (massive and brooding type), along the Pacific coast of Mexico. Allelic diversity between adults and juveniles, the latter recruited after the El Nino—Southern Oscillation (ENSO) 1997–1998 event, was determined, and level of genetic connectivity among populations was assessed. There were no significant differences in allelic diversity between adults and juveniles from the same location. Seascape spatial genetic analysis suggested two or three clusters, depending on the species: (1) Bahias de Huatulco, (2) south of the Baja California Peninsula and Bahia de Banderas, and (3) locations in the Gulf of California. The most important barrier to gene flow was detected between Bahia de Banderas and Bahias de Huatulco and corresponds with a major coastal stretch of sandy beaches and lagoons. Moderate to high gene flow was found inside and at the entrance of the Gul...