Ichthyofauna from “serranias costeiras” of the Ribeira de Iguape River basin, Southeast Brazil

Abstract

The Ribeira de Iguape River basin has about 100 fish species. This study aimed to characterize the fish community from “serranias costeiras” of the Ribeira de Iguape River basin. Samplings were conducted with electrofishing during the dry season in the years 2018-2019. The sampling effort consisted of 30 streams stretches. As a result, 50 species were captured, distributed in 37 genera, 11 families, and six orders. The species richness estimate (SChao1) was 57 species, and the coverage estimate for the entire data set was C = 0.998. Harttia kronei and Chasmocranus lopezae are endemic species and can be used as bioindicators of streams in this river basin. We captured approximately nine species by stream stretch. Beta diversity was found to be more critical for gamma diversity than alpha diversity. This finding highlights the streams environmental heterogeneity importance for maintaining regional fish diversity. We captured eight individuals of the threatened species Spintherobolus papilliferus and this indicates an expansion in the geographic distribution of this species.

Dieta de Bryconamericus microcephalus (Characiformes, Characidae) em riachos da bacia do rio Cubatão (São Paulo, Brasil)

“…Poucos estudos recentes foram desenvolvidos sobre Bryconamericus microcephalus, em sua maioria apenas inserindo a espécie como parte da caracterização da comunidade de peixes em outras regiões e bacias, como na bacia do rio Ribeira de Iguape (Frota et al, 2019;Cetra et al, 2020). São mais escassos ainda especificamente sobre a dieta de B. microcephalus Mazzoni & Rezende, 2009), sendo classificada como exclusivamente insetívora em um riacho de floresta na Ilha Grande, Rio de Janeiro (Rezende & Mazzoni, 2003).…”

Streams fish from Upper Araguaia and Middle Rio da Mortes basin, Brazil: generating subsidies for preservation and conservation of this critical natural resource

“…It is essential to highlight that the Linnean shortfall is the most significant data gap to be solved because it directly affects all other biodiversity knowledge gaps (for more details, see Hortal et al 2015). Furthermore, due to the growing and constant threat to streams, actions seeking to synthesize information about these ecosystems to guide research and conservation measures are needed (Dudgeon et al 2006, Barletta et al 2010, Cetra et al 2020). Thus, our goal was to complement the information about stream fish in two important hydrographic basins in the Cerrado biome.…”