Variación temporal de la abundancia de la comunidad de peces en el delta del río Usumacinta, México

Abstract

Estuaries are dynamics systems, with great spatiotemporal variation in their environmental and biological characteristics. In this study, we analyzed the community attributes such as richness, diversity, evenness, species and trophic guild abundance, of the ichthyofauna in the delta of the Usumacinta River during rain, dry and north wind seasons. A total of 603 individuals belonging to 15 orders, 23 families, 31 genera and 40 species were obtained. Dorosoma petenense, Cathorops aguadulce, Bairdiella ronchus, Bagre marinus, Thorichthys helleri and Megalops atlanticus, were the most abundant species, comprising 58.53% of the total abundance. Six trophic guilds were observed with zooplantivorous and zoobentivorous species having the most abundant number of individuals (50.20%). Species richness, diversity, equitability and trophic guilds abundance did not vary significantly between seasons and systems. Species abundance were significantly higher during "nortes" season. The general linear mixed model identified salinity, temperature, transparency, dissolved oxygen and pH as the variables that best predicted the temporal changes of fish abundance. In this way, the region's seasonality modifies the environmental characteristics and the fish assemblage reacts similarly to the contrasting conditions.

Trophic Ecology and Resource Partitioning of Common Snook and Mexican Snook in the Usumacinta River Delta

“…In our study, the high proportion of Poeciliidae in the diet of the Mexican Snook in C2 can be explained by their high relative abundance (Aragón‐Flores et al. 2021) and availability for the predators. For instance, one specimen of Mexican Snook from C2 contained 20 poecilids in its stomach (Petén Molly, Shortfin Molly, Spottail Killifish, and Southern Platyfish).…”

“…2019; Aragón‐Flores et al. 2021). During the rainy season, the low‐salinity conditions caused by high riverine discharge and runoff (Barriero‐Güemes and Aguirre‐León 1999; Fuentes‐Yaco et al.…”

“…In contrast, during the dry season the salinity increases and species such as Threadfin Shad and penaeid shrimps become more abundant (Tavares 2002a; Aragón‐Flores et al. 2021), thus increasing their availability and importance in the Common Snook diet.…”

Diversity, abundance, and fish assemblages in the Sontecomapan lagoon system, Veracruz, Mexico

“…Variations in abundance are also influenced by changes in the environmental conditions of the system and by seasonal migrations of the species during their life cycles (Arceo-Carranza et al, 2010;Medina-Gómez et al, 2015;Díaz-Ruiz et al, 2018;Aragón-Flores et al, 2021). Other authors such as Azevedo et al (2007) and Arceo-Carranza et al (2010), have reported similar abundance patterns in other coastal systems related to environmental conditions and the seasonal migration of species linked to their life cycles.…”