Abstract
Abstract: The Guareí River is a tributary of the Paranapanema River (Brazil), located in the upper portion of the Jurumirim Reservoir. Fish fauna studies in this watershed began in the 2000s, but they were restricted to a few waterbodies. This work conducted a broad survey of the fish fauna in tributary streams and the main channel of the Guareí River. Sampling occurred between February 2017 and November 2018 at 36 sites and using different collection methods. We captured 2,169 specimens belonging to 50 species, 16 families and 6 orders. The species accumulation curve tended to stabilize but indicated that species richness is underestimated. Almost all species are native (46); only three were non-native (Hyphessobrycon eques, Oreochromis niloticus and Poecilia reticulata) and one was undefined (Gymnotus pantanal). Among the native species, two are unknown to science (Bryconamericus aff. iheringii and Hypostomus sp. n.) and three are migratory (Leporinus friderici, Megaleporinus obtusidens and Pimelodus maculatus). In this paper, we provide images of species collected. Results indicate that the Guareí River basin is a hotspot of fish diversity in the Upper Paranapanema River, stressing the need for adequate management and conservation actions.
Highlights
The diversity of freshwater fishes in Brazil (> 3,000 species; ICMBio 2018) is higher than in any other Neotropical country (e.g., Litz & Koerber 2014; Mirande & Koerber 2015; DoNascimiento et al 2017)
Here we provide a broad survey of the fish species in the Guareí River basin, with the objective to provide the first report on fish diversity in this basin
The Guareí River is a tributary of the Paranapanema River, that flows into the upper section of the Jurumirim Reservoir (Leite et al 2012)
Summary
The diversity of freshwater fishes in Brazil (> 3,000 species; ICMBio 2018) is higher than in any other Neotropical country (e.g., Litz & Koerber 2014; Mirande & Koerber 2015; DoNascimiento et al 2017). Other important river systems hold remarkable biodiversity, such as the Upper Paraná River (Langeani et al 2007; Ota et al 2018). This basin sums more than three hundred species, with dozens still undescribed (Langeani et al 2007). Perhaps more important is the fact that several waterbodies remain uninvestigated, especially small and mid-size water courses, which may harbor species unknown (i.e., undescribed) to science (Langeani et al 2007)
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