The ichthyofauna of the Potiritá River basin: assessing the conservation status in a mining area in the Eastern Amazon

A ictiofauna da bacia do Rio Potiritá: avaliando o status de conservação em uma área de mineração na Amazônia Oriental

Abstract

Aim  Considering the importance of knowing the organisms that make up the environments impacted by human activities, we aimed to create an inventory of the ichthyofauna of a bauxite mining area in the Eastern Amazon in this work.

Methods  Specimens were collected with sieves, trawls, and gill nets at 37 points in rivers and streams during two expeditions (July 2017 and September and October 2017). After euthanasia and laboratory processes, we identified each individual to the lowest possible taxonomic level, and samples were deposited in scientific collections. We analyzed the conservation status of the species on state, national, and international lists.

Results  A total of 109 species were identified, belonging to 28 families and six orders, emphasizing the Characiformes order (57 species) and the Characidae family (22 species). We identified two new species, and none are threatened with extinction.

Conclusions  The high species richness recorded in the Potiritá River basin is noteworthy, considering its relatively small area. This diversity should be considered in future environmental impact studies and in monitoring the ichthyofauna in areas affected by human activities.

Keywords:
bauxite; fish richness; inventory; neotropical region; taxonomy