Variação espacial e temporal nas assembléias de peixes de riachos na bacia do rio Guiraí, Alto Rio Paraná

Abstract

Recebido em: 24/07/2016-Aprovado em: 02/12/2017-Disponibilizado em: 30/12/2017 RESUMO Estudo comparativo entre riachos distintos da bacia do rio Paraná pela aplicação de Protocolo de Avaliação Rápida (PAR). Sendo contemplados nove parâmetros e gradiente de estresse, classificado nas categorias: "ótima" (nota 16 a 20), "boa" (nota 11 a 15), "regular" (nota 6 a 10) e "péssima" (nota 0 a 5), sendo este último o mais alto nível de estresse. O PAR foi aplicado por dois avaliadores e as notas atribuídas a partir da inspeção visual das condições físicas do ambiente, calculou-se a média dos valores de cada parâmetro e a nota final pela somatória dos parâmetros. O PAR revelou que riachos inseridos em Unidades de Conservação apresentam-se melhores preservados. Enquanto que os riachos urbanos apresentaram a pior qualidade dos elementos físicos e estado crítico quanto aos aspectos propostos no PAR. Medidas recomendadas foram: implantação de plano de gestão ambiental para preservação dos recursos hídricos; aplicação do PAR a outros trechos; a utilização dos dados para sensibilização da população regional, considerando ser o PAR uma ferramenta útil para categorizar as condições ambientais de riachos e a qualidade de habitats. Palavras-chave: Condições ambientais. Unidade de conservação. Avaliação de habitats. Microbacias urbanas. ABSTRACT Comparative study among different streams of the Paraná River basin by applying a Rapid Assessment Protocol (RAP). It is contemplated nine parameters and stress gradient rated in the categories: excellent (score 16-20), good (score 11-15), regular (score 6-10) and poor (score 0-5). RAP was applied by two raters and the scores were assigned based on visual inspection of the physical condition of the environment; the value of each parameter was obtained by averaging the values assigned by the raters and the final score by the sum of the parameters. In a gradient, RAP revealed that water bodies within conservation units were better preserved. It"s necessary the implementation of an environmental management plan aimed at conserving water resources in the watershed; the application of RAP to other stretches; the use of data to raise awareness in the regional population, considering RAP as a useful tool to categorize the environmental conditions of the streams and habitat quality.

Ichthyofauna from three streams of the lower Iguatemi River in the upper Paraná river basin, Brazil

“…The families with the highest number of species in our study (Characidae, Heptapteridae, and Loricariidae) were also reported by Langeani et al (2007) as the most species-rich in the upper Paraná river basin. Similarly, several studies have indicated the prevalence of these families in other streams of this basin (Casatti et al 2001, Cunico et al 2009, Súarez and Lima-Júnior 2009, Felipe and Súarez 2010, Pereira et al 2014, Frota et al 2016, Bifi et al 2017. In addition, the most representative species in number of individuals, P. harpagos, A. aff.…”

Fish fauna of headwater streams of Perobas Biological Reserve, a conservation unit in the Atlantic Forest of the Northwestern Paraná state, Brazil

“…paranae Eigenmann 1914, H. ancistroides and R. quelen. The majority of these species were recorded in streams of different basins, indicating a wide geographical distribution (Castro et al 2003;Galves et al 2007;Súarez and Lima-Junior 2009;Oyakawa and Menezes 2011;Casatti et al 2012). Cyphocharax modestus (Fernández-Yépez 1948), Characidium aff.…”

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

“…Through the CCA, variables that more influenced species distribution patterns in the APA were related directly or indirectly to the water volume and habitats complexity. Several studies point out the altitude and hydrological variables (i.e., depth, width, and water velocity) as the those that best describe the distribution patterns and assemblage structure of headwaters fishes of Central Brazil (Valério et al, 2007;Aquino, 2008;Súarez & Lima-Júnior, 2009). In addition to these, riparian vegetation characteristics and the combination of types of mesohabitats and substrates should be emphasized according to their importance documented in several studies (Jones et al, 1999;Casatti et al, 2006a;Ferreira & Casatti, 2006;Teresa & Romero, 2010).…”

“…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).…”