3 research outputs found
Nova ocorrência de ciclídeo ornamental não nativo no rio Paranapanema, sul do Brasil
Fish introductions are common practices due to intentionally or unintentionally translocations of species between watersheds. Herein we report the spread of the non-native cichlid Laetacara araguaiae Ottoni & Costa 2009 in the Paranapanema River basin, southern Brazil. Native from the Araguaia River (Central Brazil), this species was probably introduced by releases made by aquarists. Its new area of occurrence is characterized as natural nursery and important for the life cycle of native fish. Due to its biological characteristics, the species has the ability to cause a negative impact on the aquatic biota through possible interactions, such as predation of eggs, larvae and juveniles of native fish, and spread of parasites.Keywords: biological invasion, Cichlinae, fish, exotic species, Upper Paraná River basin.As introduções de peixes são práticas comuns, devido às translocações intencionais ou não de espécies entre bacias hidrográficas. É relatada a dispersão do ciclídeo não nativo Laetacara araguaiae Ottoni & Costa 2009 na bacia do rio Paranapanema, sul do Brasil. Nativa do rio Araguaia (Brasil Central), esta espécie foi provavelmente introduzida por solturas realizadas por aquaristas. Sua nova área de ocorrência é caracterizada como berçário natural e importante para o ciclo de vida de peixes nativos. Devido às suas características biológicas, a espécie tem a capacidade de causar impacto negativo na biota aquática por meio de possíveis interações, tais como a predação de ovos, larvas e juvenis de peixes nativos, além de disseminação de parasitos.Palavras-chave: invasão biológica, Cichlinae, peixe, espécies exóticas, bacia do Alto rio Paraná
Impoundments facilitate a biological invasion: Dispersal and establishment of non-native armoured catfish Loricariichthys platymetopon (Isbrückler & Nijssen, 1979) in a neotropical river.
Where dam construction eliminates natural barriers to fish movement between previously disconnected catchments then this presents an opportunity for the movement of species between previously discrete assemblages. Here, the movement of a non-native armoured catfish, Loricariichthys platymetopon, is detailed from its natural range in the lower Paraná River basin, Brazil, into its invasive range in the upper basin following construction of the Itaipu Dam. Its upstream dispersal into a major tributary, the Paranapanema River, is outlined, with focus on its establishment within hydroelectric dams. This case study thus provides further evidence of how river regulation can increase opportunities for biological invasions