Composição taxonômica da assembleia de larvas de peixes no reservatório de Rosana, Rio Paranapanema, Brasil

Abstract

composition of the assemblage of fish larvae in the Rosana reservoir, Paranapanema River, Brazil. Biota Neotrop. 11(1): http://www.biotaneotropica.org.br/ v11n1/en/abstract?short-communication+bn00911012011. Abstract:There are few studies in reservoirs that consider the Early Life Stages (ELS) of fish. Information on the ecology of fish larvae are useful for understanding the biology of the species, since ELS represent a critical period in fish life cycle. In this context, knowledge about the assemblages of larvae can be valuable for the prediction and understanding of recruitment, thus assisting in the management of the environment. Therefore, this study intends to investigate the composition of the assemblage of fish larvae in different regions of Rosana reservoir. Samples were collected quarterly (March, June, September and December) in 2002, in the limnetic and littoral regions of the zones fluvial, transition and lacustrine of reservoir. In the laboratory, the material was sorted and larvae were separated and identified to lowest possible taxonomic level. The taxa that were the major contributors in the limnetic region were Plagioscion squamosissimus (Perciformes), Hypophthalmus edentatus, Pimelodus maculatus (Siluriformes), Astyanax spp. and Roeboides descalvadensis (Characiformes), whereas in the coastal region Bryconamericus stramineus and Apareiodon affinis (Characiformes) prevailed. Limnetic and littoral regions of the reservoir, as well as their respective zones showed differences in larvae species composition and segregation of assemblages can be influenced by a preference for habitats or evolutionary questions involving reproductive strategies of species. Resumo: Em reservatórios, são escassos os estudos que consideram as fases iniciais do ciclo de vida de peixes, sendo que informações sobre a ecologia de larvas de peixes são úteis para o entendimento da biologia das espécies, visto que os estágios iniciais representam um período crítico no ciclo de vida dos peixes. Neste contexto, o conhecimento a respeito das assembleias de larvas pode ser valioso para a predição e o entendimento do recrutamento, auxiliando desta maneira, no manejo do ambiente. Desta forma, o presente trabalho pretende verificar a composição da assembleia de larvas de peixes em diferentes regiões do reservatório. As coletas foram realizadas trimestralmente (março, junho, setembro e dezembro) no ano de 2002, nas regiões limnética e litorânea das zonas fluvial, transição e lacustre do reservatório de Rosana. No laboratório, o material foi triado e as larvas foram separadas e identificadas ao menor nível taxonômico possível. Os táxons que tiveram maior contribuição na região limnética foram Plagioscion squamosissimus (Perciformes), Hypophthalmus edentatus, Pimelodus maculatus (Siluriformes), Astyanax spp. e Roeboides descalvadensis (Characiformes), enquanto na região litorânea Bryconamericus stramineus e Apareiodon affinis (Characiformes). As regiões limnética e litorânea do reservatório, assim como suas respectivas zonas apresentara...

Temporal distribution and early development of Moenkausia cf. gracilima (Lucena & Soares, 2016) (Osteichthyes, Characidae) in the upper Paraná River, Brazil

“…Research on the ecology of fish eggs and larvae is of great importance to assist in the identification of spawning and nursery areas Bialetzki et al, 2005;Oliveira & Ferreira, 2008;Hermes-Silva et al, 2009), detection and evaluation of fish stocks and knowledge of population dynamics (Hempel, 1973;Agostinho et al, 2004), evaluation of the effects of different human interferences, such as pollution (Campagna et al, 2006), habitat Arrumado fragmentation (Sanches et al, 2006) and species introduction , Kipper et al, 2011. In addition, the elucidation of the systematic and/or phylogenetic position of certain species or groups of species is frequently supported by information about the early stages of fish life .…”

New occurrence of a non-native ornamental cichlid in the Paranapanema River, southern Brazil

“…In the Upper Paraná River basin, various species of ornamental fish were introduced because of intentional releases by aquarists. Among these species are: Gymnocorymbus ternetzi (Boulenger 1895), Hyphessobrycon eques (Steindachner 1882), Poecilia reticulata Peters 1859, Xiphophorus hellerii Heckel 1848, and Xiphophorus maculatus (Günther 1866) (Graça and Pavanelli, 2007;Langeani et al, 2007;Ortega et al, 2015). This practice is futile and points out the urgency to raise aquarists' awareness about the problems caused by introduced and invasive species.…”

“…The species was listed as Laetacara sp. (Graça and Pavanelli, 2007;Langeani et al, 2007). However, previous studies still had not registered its introduction to the Paranapanema River basin (Casatti et al, 2003;Pelicice et al, 2005;Ferrareze and Nogueira, 2011;Kipper et al, 2011).…”

“…However, it has already been collected outside of its natural distribution in the floodplain of the Upper Paraná River (Graça and Pavanelli, 2007) and tributaries, such as the São José dos Dourados (Casatti et al, 2006), Grande (Souza-Filho and Casatti, 2010) and Paranaíba rivers (Fagundes et al, 2015). The new record of L. araguaiae caught our attention because it is the tenth cichlid species to have been introduced to the Paranapanema River (Brandão et al, 2009;Orsi, 2010;Britton and Orsi, 2012).…”

Assessment of benthic macroinvertebrates at Nile tilapia production using artificial substrate samplers

“…Artificial substrates are mostly used in marine ecology studies (Guerra-Castro and Cruz-Motta, 2014), but freshwater studies are also found in rivers (Volkmer-Ribeiro et al, 1984), coastal lagoons (Henriques-de-Oliveira et al, 2007), inland lagoons (Strixino and Trivinho-Strixino, 2006), small dam reservoirs in the savanna ecosystem in the State of Paraíba (Souza et al, 2008) and dams (Kipper et al, 2011). However, in aquaculture there are few studies that employ biomonitoring with the use of benthic organisms.…”