Resumen

CHAVEZ-LOPEZ, Rafael  y  ROCHA-RAMIREZ, Arturo. Fish community composition from El Llano Lagoon blind estuary, Veracruz, Mexico. Rev. Mex. Biodiv. [online]. 2020, vol.91, e912494.  Epub 01-Mar-2021. ISSN 2007-8706.  https://doi.org/10.22201/ib.20078706e.2020.91.2494.

Estuaries are coastal ecosystems that contribute with different natural services to the organisms inhabiting them, but the ecological research on seasonally closed inlets by sand bars are scarce; in this contribution the fish assemblages from El Llano Lagoon estuary in May 2013 and May 2014 are described. We performed 9 monthly samplings, through which we recorded 37 species belonging to 22 families, most of them marine. The highest species richness with 21 and 20 species occurred in September 2013 and February 2014, respectively; the lowest one in May 2013 (4) when the inlet was closed and conditions of hypersalinity were present. Using NMDS indirect ordination analysis, 3 fish assemblages related to closed estuarine inlet and hypersalinity conditions were defined (> 70 PSU, May 2013), between dry-rainy seasons in euhaline and mesohaline salinity conditions (July-October 2013), and nortes-dry seasons in marine salinity condition (December 2013-May 2014), moreover Anosim test proved the differences among these fish assemblages and with Simper test was demonstrated that variations in abundance of dominant species and the occasional presence of marine and estuarine species produced the assemblage’s differences.

Palabras llave : Fishes; Assemblages; Blind estuary; Hypersalinity; El Llano Lagoon; Veracruz; Gulf of Mexico.

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