Reef fish structure assemblages in oceanic islands of the eastern tropical Pacific: Revillagigedo Archipelago and Clipperton atoll

摘要: Revillagigedo Archipelago and Clipperton atoll are oceanic islands located in the eastern tropical Pacific. The composition trophic structure of their fish assemblages have never been characterized detail, aim this study was therefore to analyse community assess similarity between these two areas. Underwater visual censuses were conducted using band transects at depth levels three (Socorro, San Benedicto, Roca Partida) atoll. We calculated ecological indices (density, richness, Shannon diversity, Pielou evenness, taxonomic distinctiveness) for each transect. These compared order determine quantitative differences among bathymetric levels. Qualitative analyses (ANOSIM, nMDS, SIMPER) also performed. Finally, we analysed functional diversity four studied sites. results showed significant all indices, except (H′). Partida site with greatest abundance richness due presence pelagic species large numbers. No found suggesting a high degree redundancy. Lower‐level carnivores mean level values 3.3 3.8 dominated both ordination analysis did not show clear difference islands, although has particular fauna by endemic (Thalassoma robertsoni Stegastes baldwini). In conclusion, communities areas seem quite similar, but assemblage differs. particular, is differentiated influence species.