Fishes from tributaries of the Itacaiúnas river
DOI:
https://doi.org/10.37002/biodiversidadebrasileira.v15i1.2683Palavras-chave:
Stream , diversity , monitoringResumo
Anthropogenic activities in the Amazon region have an impact on the aquatic environment and, consequently, on the organisms that live there. The lack of knowledge about the ecological relationships of the fish community in the region, as well as their relationship with the environmental variables that determine their survival and distribution, leads to a loss of data for ecological studies and biomonitoring. The objective of our study was to evaluate how environmental variables influence the richness and abundance of fish species in tributaries of the Itacaiúnas river, Pará, Brazil. Therefore, we tested the hypothesis that the richness and abundance of these communities vary according to the variation of physical and chemical parameters in these streams. The study was carried out in 16 streams in the Carajás National Forest, with collections of the fish community, measurements of physical and chemical variables in the water and channel morphology. To synthesize the environmental variables, we used a Principal Components Analysis. We related environmental variables to species richness and individual abundance using forward selection regression with Poisson distribution. The results show that environmental variables influence the richness and abundance of the fish community as they are related to habitat availability, food, life cycle, trophic relationships and water quality. These results highlight the importance of water quality, particularly turbidity, which had the greatest influence on the condition of these aquatic communities, providing valuable information for future conservation and monitoring strategies.
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