Estructura de la comunidad de peces en cuatro estuarios del Pacífico mexicano central

Abstract

Community structure of estuarine fish fauna were analyzed in estuaries of Barra de Nexpa, Teolán, Mexcalhuacán and Barra de Pichi, Michoacán, Mexico for four night collections at the mouth of every estuary. Also, some physicochemical parameters were determined. Were captured a total of 2014 individuals with a weight of 10393.42 g, belonging to 31 species and 20 families. Barra de Nexpa recorded the highest richness (S= 21) and the highest percentage of rare species (22.6%). The most abundant species were Agonostomus monticola and Mugil curema while Lutjanus novemfasciatus and Dormitator latifrons recorded the highest biomass. Salinity, temperature, dissolved oxygen and transparency, showed significant seasonal differences influenced by seasonal variation in precipitation. The composition and dominant species were different at each site and in each season while the abundance, biomass and richness showed no significant variation. The fish community was composed of marine and freshwater species that use estuaries as nursery areas, marine species that are incorporated into the estuaries occasionally and estuarine species that are part of these ecosystems for most of its life cycle.