Cytotaxonomic and evolutionary considerations about karyotipic data of fishes from the Iguaçu River Basin in South of Brazil

Abstract

ABSTRACT

Karyotypic variation of Glanidium ribeiroi Haseman, 1911 (Siluriformes, Auchenipteridae) along the Iguazu river basin

“…Studies of several fish species of the Iguazu river basin show a high genetic variability among natural populations of the same species (Agostinho et al, 1999) (Kantek et al, 2007), the reason being that, for the most part, this data were obtained after the construction of dams in the Iguazu river. Regarding G. ribeiroi, existing data was collected from most parts of the Iguazu river, comprising the majority of the course with dams (Suzuki, 1999;Cassemiro et al, 2005;Agostinho et al, 2007), with exception to some rivers of high Iguazu (Ingenito et al, 2004).…”

“…Ingenito et al (2004) reported 81 valid species in this watershed, and when compared to other tributaries of the Paraná basin, the Iguazu has a low number of species (Julio Junior et al, 1997). The chromosomal studies related to the Iguazu river basin include 24 nominally valid species, and at least 10 others that had not yet been described (Kantek et al, 2007). Regarding Auchenipteridae, the chromosomal studies are still scarce, comprising only species of the genera Ageneiosus, Auchenipterus, Glanidium, Parauchenipterus and Tatia (Fenocchio and Bertollo, 1992;Ravedutti and Júlio Junior, 2001;Fenocchio et al, 2008;Lui et al, 2009Lui et al, , 2010Lui et al, , 2013a.…”

Molecular data reveal a diverse Astyanax species complex in the upper Iguaçu River

“…B, Astyanax sp. C and A. altiparanae (Kantek et al, 2007). Even though intermediate morphological variation could be associated with hybridization, the diagnostic features used to identify Astyanax species, in general, are based on a combination of characters, sometimes with high intraspecific variation.…”

Inventory of the ichthyofauna from the Jordão and Areia river basins (Iguaçu drainage, Brazil) reveals greater sharing of species than thought

“…In addition to those species that we collected for this study, other species have been reported for the area in the literature. The literature includes recent species descriptions (Casciotta et al 2004;Wosiacki and Garavello 2004;Garavello 2005;Pereira 2005;Lucinda et al 2006;Garavello and Shibatta 2007;Casciotta and Almirón 2008;Ingenito et al 2008;Lucinda 2008;de Pinna 2008a, 2008b;Pavanelli and Bifi 2009;Bifi et al 2009;Vera Alcaraz et al 2009;Garavello and Sampaio 2010;Říčan et al 2011;Garavello et al 2012) as well as ecological or ecomorphological studies and inventories covering the study area (Garavello et al 1997;Lucinda 2005;Loureiro-Crippa and Hahn 2006;Kantec et al 2007;Hahn and Fugi 2008;Pavanelli and Oliveira 2009;Garavello et al 2012;Baumgartner et al 2012;Mise et al 2013). Species not captured by us but mentioned in previous studies were included in the list, as were species recorded in the Species Link on-line database da Esperança, we sampled several localities within the two basins.…”