Hydrological seasonality dictates fish fauna of the lower Araguaia River, Tocantins-Araguaia basin

摘要: Hydrological seasonality of flow dictates diversity in tropical aquatic ecosystems. Large rivers and tributaries are typically more depth shows increased velocity area flood than dry season. A thorough analysis effect on fish community structure can provide valuable information major forces driving communities. However, these types analyses have been limited by poor knowledge diversity, human impacts environment, biased sampling methods. We used a pristine large river (and tributaries) five (12 gill nets, beach seine longlines, branch baited hooks, cast nets) fishing gears to present an evaluation community. sampled fourteen sites channel the lower Araguaia River. Sampling was conducted (March May 2009) (July September seasons typical seasonal year. Species richness, Shannon Diversity Evenness, mean similarity binary data, abundance (CPUE) were analyzed PERMANOVA PCoA. also species most correlated (by Spearman correlation rank) with Features differed significantly between seasons, but not tributaries. The composition community, representative changed quite along Flood showed lotic-related species, presented lentic-related species. Thus, we achieved alternation season, both for