Astyanax jordanensis (Ostariophysi: Characidae), a new species from the rio Iguaçu basin, Paraná, Brazil

Vera-Alcaraz, Héctor S.; Pavanelli, Carla Simone; Bertaco, Vinicius de Araújo

doi:10.1590/s1679-62252009000200008

Cited by 25 publications

(32 citation statements)

References 9 publications

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“…This is the case of the Iguaçu River basin; this sub-basin was isolated from the Paraná River 22 million years ago by the Iguaçu Falls, which served as an effective barrier to the dispersal of fish species (Alcaraz et al, 2009). A high degree of endemism (around 70%) (Baumgartner et al, 2012) and the absence of many families of fish that are common in the Paraná River basin are typical features of the Iguaçu basin (Garavello et al, 1997;Júlio Jr. et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Diet and trophic structure of the fish fauna in a subtropical ecosystem: impoundment effects

2013

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This study examined the diet and trophic structure of the fish fauna, over temporal and spatial scales, as affected by the impoundment of the Iguaçu River in the region of Salto Caxias, Paraná State, Brazil. Sampling was conducted before (March 1997 - February 1998) and after the impoundment (March 1999 - February 2000), at four sampling sites. The stomach contents were analyzed by the volumetric method. The species could be organized in 10 trophic guilds: algivores, carcinophages, detritivores, herbivores, aquatic insectivores, terrestrial insectivores, invertivores, omnivores, piscivores, and planktivores; the first and last guilds were represented only in the post-impoundment period. Similarity patterns and feeding changes were summarized by a non-metric Multi-dimensional Scaling (nMDS) analysis and statistically tested by a Permutational multivariate analysis of variance (PERMANOVA). Most species showed feeding changes, except for the piscivores and detritivores. These changes were related to the temporal factor (impoundment phases), such as reduced intake of benthic organisms and allochthonous food, which were usually replaced by resources from the reservoir itself (algae, microcrustaceans, and fish), simplifying the food spectrum of the fish fauna. A different indicator of food resources (IndVal) corroborated these changes in the feeding of the species. The proportions of the trophic guilds evaluated based on the catch per unit of effort (CPUE) and tested by ANOSIM were significantly different before and after the impoundment. Herbivores and piscivores were the guilds that contributed (SIMPER) to these differences, especially the high increase in biomass of the piscivore guild after the impoundment. Variations in the abundance of trophic guilds were more directly related to changes in the feeding habits of the fish fauna than to increases in the number and biomass of the species that constitute these guilds.

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Section: Introductionmentioning

confidence: 99%

Diet and trophic structure of the fish fauna in a subtropical ecosystem: impoundment effects

2013

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“…The rio Iguaçu basin is known by its high ichthyofaunistic endemism (Haseman, 1911;Garavello et al, 1997;Ingenito et al, 2004;Baumgartner et al, 2006;Ingenito et al, 2008;Alcaraz et al, 2009;Abilhoa & Duboc, 2007;Garavello & Sampaio, 2010), especially concerning to genus Astyanax (Pavanelli & Oliveira, 2009). Among the 14 species of Astyanax reported from the rio Iguaçu basin, 13 are endemic to the basin, with some of them only occurring in smaller sub-basins (e.g.…”

Section: Discussionmentioning

confidence: 99%

A new species of Astyanax (Ostariophysi: Characiformes: Characidae) from the upper rio Iguaçu basin, southern Brazil

Ingenito¹,

Duboc²

2014

Neotrop. ichthyol.

864

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Astyanax eremus, a new species of geographically isolated characid fish, is described from a small tributary of the upper rio Iguaçu basin. The new species belongs to the Astyanax scabripinnis species complex and is easily distinguished from its congeners included in this group by its allometric growth of the mouth, which goes from terminal in young individuals to subterminal mouth in larger specimens. Additionally, the new species is distinguished by meristic and morphometric characters. Astyanax eremus presents an evident polymorphism on the traditional character "number of teeth in inner premaxillary row". Comments about that character are provided.Astyanax eremus, uma espécie nova de caracídeo geograficamente isolada, é descrita de um pequeno tributário da bacia do alto rio Iguaçu. A espécie nova pertence ao complexo de espécies Astyanax scabripinnis e é facilmente distinguível dos congêneres deste grupo por apresentar desenvolvimento alométrico da boca, a qual passa de terminal nos indivíduos jovens a subterminal nos maiores. Além disso, a espécie nova é diagnosticada por caracteres merísticos e morfométricos. Astyanax eremus apresenta um acentuado polimorfismo do tradicional caráter "número de dentes da série interna do pré-maxilar". Uma discussão a respeito deste caráter é apresentada.

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“…Currently 84 fish species are known to occur in the basin (Garavello et al, 1997;Ingenito et al, 2004;Baumgartner et al, 2006). Most of these species are endemic to that basin, especially those belonging to the genus Astyanax Baird & Girard, 1854(Garavello et al, 1997Alcaraz et al, 2009). Intensive collections carried out by the Núcleo de Pesquisas em Limnologia, Ictiologia e Aqüicultura (Nupélia) of the Universidade Estadual de Maringá (UEM), in the lower rio Iguaçu basin over the past 15 years resulted in the collection of thousands of fish specimens.…”

Section: Introductionmentioning

confidence: 99%

“…gymnogenys Eigenmann, 1911;A. ita Almirón, Azpelicueta & Casciotta, 2002;A. jordanensis Alcaraz, Pavanelli & Bertaco, 2009;A. leonidas Azpelicueta, Casciotta & Almirón, 2002;A.…”

Section: Introductionunclassified

A redescription of Astyanax gymnodontus (Eigenmann, 1911), new combination, a polymorphic characid fish from the rio Iguaçu basin, Brazil

Pavanelli

Oliveira

2009

Neotrop. ichthyol.

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A redescription of Astyanax gymnodontus (Eigenmann, 1911), new combination, a polymorphic characid fish from the rio Iguaçu basin, BrazilCarla Simone Pavanelli and Carlos Alexandre Miranda Oliveira Astyanax gymnodontus (Eigenmann, 1911), new combination, a polymorphic characid fish endemic to the Rio Iguaçu basin in Southern Brazil, is redescribed. The species was originally described as belonging to the monotypic genus Psalidodon, distinguished from Astyanax by the possession of a single series of teeth on the premaxilla (vs. two series), by the presence of relatively compressed teeth on the premaxillary and dentary bones (vs. relatively bulky teeth), and by the absence of lips (vs. lips present). Examination of a large number of specimens from the rio Iguaçu basin that present dental and lip features that were intermediate between Psalidodon and Astyanax indicated that specimens attributed to Psalidodon show extreme characters observed within a polymorphic Astyanax species. Accordingly, the genus Psalidodon is synonymized under Astyanax. Specimens of "Astyanax sp. F" morphotype from the rio Iguaçu basin belong to the species Astyanax gymnodontus and display a regular tooth arrangement and morphology, and their lip development is similar to that of other Astyanax species.Astyanax gymnodontus (Eigenmann, 1911), combinação nova, um peixe caracídeo polimórfico, endêmico da bacia do rio Iguaçu no sul do Brasil, é redescrito. A espécie foi originalmente descrita como pertencente ao gênero monotípico Psalidodon, diagnosticado de Astyanax pela posse de uma única série de dentes no pré-maxilar (vs. duas séries), pela presença de dentes relativamente comprimidos nos ossos pré-maxilar e dentário (vs. dentes relativamente robustos), e pela ausência de lábios (vs. lábios presentes). O exame de um grande número de espécimes da bacia do rio Iguaçu, apresentando características dentárias e labiais intermediárias entre Psalidodon e Astyanax, indicou que espécimes atribuídos a Psalidodon mostram caracteres extremos observados em uma espécie de Astyanax. Assim, o gênero Psalidodon é sinonimizado sob Astyanax. Espécimes do morfótipo "Astyanax sp. F" da bacia do rio Iguaçu pertencem à espécie Astyanax gymnodontus e exibem dentes com arranjo e morfologia regular, bem como lábios com desenvolvimento similar a outras espécies de Astyanax.

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Astyanax jordanensis (Ostariophysi: Characidae), a new species from the rio Iguaçu basin, Paraná, Brazil

Cited by 25 publications

References 9 publications

Diet and trophic structure of the fish fauna in a subtropical ecosystem: impoundment effects

Diet and trophic structure of the fish fauna in a subtropical ecosystem: impoundment effects

A new species of Astyanax (Ostariophysi: Characiformes: Characidae) from the upper rio Iguaçu basin, southern Brazil

A redescription of Astyanax gymnodontus (Eigenmann, 1911), new combination, a polymorphic characid fish from the rio Iguaçu basin, Brazil

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