SciELO - Scientific Electronic Library Online

 
vol.7 issue4Aquatic insects as the main food resource of fish the community in a Neotropical reservoirStability and spatio-temporal structure in fish assemblages of two floodplain lagoons of the lower Orinoco River author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Neotropical Ichthyology

Print version ISSN 1679-6225

Abstract

JULIO JUNIOR, Horácio Ferreira; TOS, Claudenice Dei; AGOSTINHO, Ângelo Antonio  and  PAVANELLI, Carla Simone. A massive invasion of fish species after eliminating a natural barrier in the upper rio Paraná basin. Neotrop. ichthyol. [online]. 2009, vol.7, n.4, pp. 709-718. ISSN 1679-6225.  http://dx.doi.org/10.1590/S1679-62252009000400021.

Based on long-term studies in the upper rio Paraná basin, in addition to a broad review of literature and other information, we were able to identify 33 species of native fishes in the lower rio Paraná basin that successfully colonized the upper rio Paraná after Itaipu impoundment, that flooded the natural geographic barrier constituted by the Sete Quedas Falls. These species belong to six Orders, encompassing two of Myliobatiformes, six of Characiformes, 17 of Siluriformes, six of Gymnotiformes, one of Perciformes, and one of Pleuronectiformes. Extensive remarks regarding each species, including their influence upon the native assemblage, in addition to comments on other non-indigenous species, are also provided. We conclude that, in spite of its widespread neglected by environmental impact studies, massive invasion of species is a real possibility when natural barriers are suppressed by reservoirs.

Keywords : Invasive species; Biodiversity; Reservoir Impacts; Ecoregion; Sete Quedas Falls.

        · abstract in Portuguese     · text in English     · pdf in English