Ictiofauna dos córregos do Parque Nacional de Brasília, bacia do Alto Rio Paraná, Distrito Federal, Brasil Central

Abstract

Abstract:The aims of this study were to survey the stream fishes of Parque Nacional de Brasília, Federal District, and identify its community structure variation. We sampled streams in the Bananal and Santa Maria/Torto subbasins at Upper Paraná River. Lotic systems in this region are well preserved, as indicated by environmental integrity and the maintenance of native biological components. A total of 8,614 individuals were collected belonging to four orders, nine families, and twenty-eight species (being 11 new to science). The predominant order was Characiformes, followed by Siluriformes. Poecilia reticulata was the only nonnative fish specie found. Astyanax sp. and Hyphessobrycon balbus displayed widest spatial distribution. The most abundant species was Knodus moenkhausii with 64.5% of individuals. Highest fish richness and abundance were found in the wider and deeper stretches.

Structure and integrity of fish assemblages in streams associated to conservation units in Central Brazil

“…The dominance of the species K. moenkhausii, adapted to tolerate sites where the riparian vegetation is not preserved, primarily without feeding preferences between allochthonous and autochthonous items, can be explained by its large feeding plasticity (CenevivaBastos & Casatti, 2007). The second representative species in terms of abundance was Astyanax sp., similarly to that observed by Ribeiro (1994) and Aquino et al (2009). This species has a great colonization capacity, and in some headwater stretches was the unique species sampled.…”

“…As well as in other studies in upper rio Paraná system, including Distrito Federal (Aquino et al, 2009) and São Paulo State (Casatti et al, 2006b;Ceneviva-Bastos & Casatti, 2007), K. moenkhausii was registered as the most abundant species. According to Langeani et al (2007), this species is not originally from the upper Paraná drainage, and its introduction may be related to Itaipu dam construction, finished in 1982 (Agostinho et al, 2007).…”

“…One consequence of this process would be the high rate of allopatric speciation (Castro, 1999). This idea is supported by the high number of undescribed species or in undefined taxonomic situation (Castro et al, 2003;Buckup et al, 2007;Langeani et al, 2007;Valério et al, 2007;Aquino et al, 2009).…”

“…According to Aquino et al (2009), despite of recent efforts, the Center-West region of Brazil still faces a shortage of data involving fish assemblages in streams of upper Paraná. Is worthwhile to mention some studies conducted in the States of Goiás (Benedito-Cecilio et al, 2004;Fialho et al, 2007;Araújo & Tejerina-Garro, 2007) and Mato Grosso do Sul (Súarez, 2008;Súarez & Lima-Júnior, 2009).…”

“…Is worthwhile to mention some studies conducted in the States of Goiás (Benedito-Cecilio et al, 2004;Fialho et al, 2007;Araújo & Tejerina-Garro, 2007) and Mato Grosso do Sul (Súarez, 2008;Súarez & Lima-Júnior, 2009). In the Distrito Federal should be emphasized the studies of Viana (1989), Ribeiro (1994), and Aquino et al (2009). The high endemism and, in consequence of the absence of studies, the high number of undescribed species are constantly cited in researches conducted in the region.…”