Diversity in two rivers and challenges for conservation in the eastern amazon

The present study investigated and compared the diversity of two nearby streams with explicit differences in urban exploration. Pointing to richness, dominance and diversity models in both environments, the Jacubinha and Neblina streams, tributaries of the Lontra sub-basin and tributaries of the Araguaia-Tocantins Basin in eastern Amazon, north of the state of Tocantins. Sampling took place between 2014 and 2020, using multiple methodologies (nets, cast nets, hauling, scoops and sieves). reaching 1374 individuals of 85 identified species, distributed in 26 families, and 8 orders. These identified families, Characidae, Cichlidae, Loricariidae were the most diverse. Thus, species with the greatest abundance in two environments were Knodus heteresthes, Poecilia reticulata, Phenacogaster cf calverti, Astyanax novae and Psalidodon cf fasciatus. Presenting a difference close to 80% in their taxon varieties, indicating biological impoverishment this stream. However, the species mentioned in this article show high richness, as estimated for an ecotonal environment such as the one between Cerrado and Amazon Forest, in eastern Amazon. Such distinct patterns of arrangement and abundance of taxa resemble the marked attributes of the sampled habitats, as well as their degree of deterioration.