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espanolResumen: El zooplancton dominante de la laguna La Mancha, Veracruz, Mexico, fue analizado con el objetivo de evaluar su variabilidad estacional y nictimera, asi como la influencia que sobre el ejercen las principales variables ambientales. De mayo 2012 a abril 2013, cada mes se realizo un ciclo de 24 h, tomando muestras cada 4 h, en la boca de la laguna. Simultaneamente a la toma de muestras de zooplancton, se registraron parametros ambientales in situ como la temperatura, oxigeno disuelto, salinidad, clorofila a y numero de celulas fitoplanctonicas. Se capturaron 54 taxa (principalmente del holoplancton) y 10 de ellos fueron considerados dominantes (abundancia total > 0,5%). La comunidad estuvo dominada por dos especies de copepodos (Acartia tonsa y Pseudodiaptomus pelagicus), asi como por larvas zoea de braquiuros (~85%). La abundancia total del zooplancton mostro pulsos significativos a lo largo del ano, uno en febrero-marzo dominado por copepodos y otro en septiembre-octubre, dominado por larvas de decapodos. A pesar de que la abundancia total del zooplancton fue mayor en la noche, solo P. pelagicus, anfipodos, megalopas y otras larvas de decapodo fueron significativas durante este periodo. De acuerdo con un Analisis de Correspondencia Canonica, el estado de la boca (abierta/cerrada), numero de cianofitas y precipitacion fueron los factores ambientales mas importantes en la determinacion de la abundancia del zooplancton dominante. EnglishAbstract: The dominant zooplankton of the La Mancha lagoon, Veracruz, Mexico, was analyzed with the objective of evaluating its seasonal and diel variability, as well as the influence of the main environmental variables on this variability. From May 2012 to April 2013, every month a 24-h cycle was completed, taking samples every 4 h, at the mouth of the lagoon. Simultaneously with zooplankton sampling, in situ environmental parameters such as temperature, dissolved oxygen, salinity, chlorophyll a and number of phytoplankton cells were recorded. We collected 54 taxa (mainly holoplankton) and 10 of them were considered dominant (total abundance > 0.5%). The zooplankton community was dominated mainly by two species of copepods (Acartia tonsa and Pseudodiaptomus pelagicus), as well as zoea larvae of brachyura (~85%). At seasonal level, the total abundance of zooplankton showed significant pulses throughout the year, one in February-March dominated by copepods and another in September-October, dominated by decapod larvae. On a diel scale, although total zooplankton abundance was significantly higher at night, only P. pelagicus, amphipods, megalopae, and other decapod larvae showed significant differences at this level. According to a Canonical Correspondence Analysis, the mouth stage (open/close), the number of cyanophytes and precipitation were the most important environmental factors in determining the abundance of the dominant zooplankton.

Variación estacional y nictímera en la distribución del zooplancton dominante en una laguna costera tropical