Dynamic of fish trophic guilds in the plateau-plain gradient in the Paraguay River, Northern Pantanal

This study aims to evaluate the dynamics of fish trophic guilds according longitudinal gradient Paraguay River, northern Pantanal, Brazil. Three river segments were sampled: plateau, confluence and plain. These have different physical biological characteristics, with high water flow in forest areas plateau slow meanders, Pantanal typical vegetation. In total, 26,542 individuals distributed 130 species collected. The sampled characterized seven guilds. From identified, only three statistically related type environment; herbivores more abundant piscivores confluence, invertivores According values corrected Akaike Information Criteria, environmental variable that best explains abundance piscivorous fishes River was transparency. For herbivores, model explained variation composed by temperature, altitude dense proportion. represented invertivores. Water transparency, altitude, width proportion determining factors for distribution piscivorous, herbivorous invertivorous as a response an meets its ecological requirements. Understanding relationships is fundamental management actions, contributing maintenance ecosystem services species. Therefore, future research must be taken into account regarding relationships.