Reef Fish Assemblage in Two Insular Zones within the Mexican Central Pacific
Carlos Vladimir Pérez de-Silva; Amílcar Leví Cupul-Magaña; Alma Paola Rodríguez-Troncoso; Fabián Alejandro Rodríguez-Zaragoza
Reefs fishes are sensitive to environmental changes, particularly in areas such as the Mexican Central Pacific (MCP), which has a high environmental variability favored by currents. This study assesses the temporal variation in ecological indicators of fishes in Marietas (MI) and Isabel islands (II) in the MCP during 2010&ndash:2017. Overall, 118 species were recorded at MI and 95 in II. The highest abundance was recorded in 2013 at MI, and in 2015 at II, with an observed sample coverage >: 0.79 for all years. MI showed higher annual taxonomic distinctness and richness than II. Annual biomass and assemblages were different between years and islands. The changes in both islands&rsquo: community structure were influenced by ENSO events. A high proportion of the dissimilarity among years is represented in 10 species, and the difference among years for each island is given by rare species. Annually, community indicators (&Delta:+, q = 1, and q = 2) and physicochemical factors were not related except for q = 0 and the chlorophyll concentration: this is due to the inter-annual variation within the area. The variation in fish communities on both islands results from mesoscale phenomena that have a different effect on each island due to the characteristics of their shelf and oceanography.
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