Temporal and Spatial variation in composition of feeding guilds of the fish fauna of oxbow lakes of the Cuiaba River, Northern Pantanal

This study aimed to evaluate the spatial and temporal variation of the feeding guilds of fish communities of 10 oxbow lakes of the Cuiaba River in the Pantanal. The lagoons were sampled in three periods of the hydrological cycle (beginning and ending of the dry and flooding season of 2005). The feeding guilds were determined through analysis of stomach contents of the most abundant species in the community. Were analyzed 37 species belonging to eight trophic guilds (insectivore, herbivore, omnivore, zooplanktivore, planktivore, detritivore, benthivore and iliophage), whitch varied spatially and temporally. A change in the composition of trophic guilds between the periods and locations was observed, but the number of guilds did not vary for either of them. Our results suggest that spatial and temporal variation in the composition of the guilds can be related to many factors, such as alterations in the composition of the community where new species can contribute to the different trophic guilds; and the exploration of more abundant resources in certain periods of the year favoring the presence of some guilds only in some periods.