Peixes do baixo rio Iguaçu

Baumgartner, Gilmar; Pavanelli, Carla Simone; Baumgartner, Dirceu; Bifi, Alessandro Gasparetto; Debona, Tiago; Frana, Vitor André

doi:10.7476/9788576285861

Cited by 117 publications

(183 citation statements)

References 14 publications

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“…Silfvergrip (1996) considered these two species synonymous with R. quelen, however, no exemplar from Iguaçu basin was examined by the author, as mentioned by Baumgartner et al (2012). On the other hand, genetic studies conducted by Abucarma & Martins-Santos (2001) demonstrated karyotypic differences between the species of Rhamdia of Iguaçu River basin.…”

Section: Introductionmentioning

confidence: 99%

“…The Iguaçu River drainage is the largest basin among the rivers of Paraná State (Eletrosul 1978), and is known by its high endemism, estimated in 69.7% of the total of species (Baumgartner et al 2012). This unique condition is probably caused by the basin isolation propitiated by the Iguaçu falls (Baumgartner et al 2012) and a series of smaller falls on its main channel.…”

Section: Introductionmentioning

confidence: 99%

“…This unique condition is probably caused by the basin isolation propitiated by the Iguaçu falls (Baumgartner et al 2012) and a series of smaller falls on its main channel. Thus, the river has great hydroelectric potential, which has been explored for over thirty years, resulting in a large sequence of dams, whose reservoirs occupy at least 41% of its total extension (Júlio-Junior et al 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the river has great hydroelectric potential, which has been explored for over thirty years, resulting in a large sequence of dams, whose reservoirs occupy at least 41% of its total extension (Júlio-Junior et al 1997). Although its geomorphological and hydrographical features provide a high ecological importance for the basin, its fish fauna has been relatively poorly studied, since most studies are generally restricted to the lower Iguaçu River basin (Universidade… 2002, Baumgartner et al 2012.…”

Section: Introductionmentioning

confidence: 99%

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Ecomorphological differences between Rhamdia (Bleeker, 1858) populations from the Iguaçu River basin

2013

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Morphological and genetic evidences suggest that Rhamdia branneri and Rhamdia voulezi, currently considered synonymous of Rhamdia quelen, are in fact two valid species. Furthermore, in the taxonomic revision of R. quelen, no exemplars from the Iguaçu River were examined, which makes the synonymy doubtful. Considering the two species as valid, it was hypothesized that R. branneri and R. voulezi have ecomorphological differences, with the objective to verify if they can be considered ecologically distinct. Ecomorphological characterization was conducted using ecomorphological indices. For statistical analysis, a Principal Component Analysis (PCA), a Multiresponse Permutation Procedure (MRPP), and a Discriminant Analysis (DA) were performed. The ordination provided by the PCA evidenced ecomorphological separation, with R. branneri having morphological aspects related to benthic fishes, and R. voulezi having morphological characteristics related to pelagic and lentic habitats. The DA results confirmed the morphological tendencies found in the PCA, and the MRPP showed significant statistical differences between the ecomorphology of Rhamdia species. In this way, the initial hypothesis can be corroborated. These results allied to information about diet, genetics, and reproduction can be helpful for the elucidation of the taxonomic status of R. branneri and R. voulezi. Resumo: Evidências morfológicas e genéticas sugerem que Rhamdia branneri e Rhamdia voulezi, atualmente consideradas sinônimas de Rhamdia quelen, são, de fato, duas espécies válidas. Adicionalmente, na revisão taxonômica de R. quelen nenhum exemplar do rio Iguaçu foi examinado, o que torna a sinonímia duvidosa. Considerando as duas espécies como válidas, foi testada a hipótese de que R. branneri e R. voulezi possuem diferenças ecomorfológicas, com o objetivo de verificar se elas podem ser consideradas ecologicamente distintas. A caracterização ecomorfológica foi conduzida utilizando os índices ecomorfológicos. Para a análise estatística foram feitas Análise de Componentes Principais (ACP), Procedimento de Permutação Multiresposta (PPMR) e Análise Discriminante (AD). A ordenação proveniente da ACP evidenciou separação ecomorfológica, com R. branneri possuindo aspectos morfológicos relacionados a peixes bentônicos e R. voulezi possuindo características morfológicas relacionadas a habitats pelágicos e lênticos. Os resultados da AD confirmaram as tendências morfológicas encontradas na ACP, e o PPMR mostrou diferenças estatísticas significativas entre as espécies de Rhamdia. Dessa maneira, a hipótese inicial pôde ser corroborada. Esses resultados, aliados a informações sobre a dieta, genética e reprodução, podem ser úteis para a elucidação do status taxonômico de R. branneri e R. voulezi. Palavras-chave: endemismo, Heptapteridae, Rhamdia voulezi, Rhamdia branneri, Rhamdia quelen, ecomorfologia.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ecomorphological differences between Rhamdia (Bleeker, 1858) populations from the Iguaçu River basin

2013

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“…This high density combined with the presence of other four abundant Astyanax species (Baumgartner et al, 2012) that also fed mostly of plants before damming (Cassemiro et al, 2005;Delariva et al, 2013) and the apparently space segregation between those species (Cassemiro et al, 2005) can cause changes in diet, due, for example, to the lack of preferential resource or competition. According to Agostinho et al (1999), areas upstream from reservoirs are the least affected by dams.…”

Section: Discussionmentioning

confidence: 99%

Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundances

2016

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The increase in abundance of small-sized fishes is common after a reservoir is formed. There is an increase in the consumption of fish, from typically piscivorous fish to opportunistic species that take advantage of abundant resources. This study aims to evaluate the effects of diet changes induced by damming on the feeding activity and condition factor of typically piscivorous (Hoplias aff. malabaricus and Oligosarcus longirostris) and opportunistic (Astyanax lacustris (ex Astyanax altiparanae) and Pimelodus britskii). Sampling was conducted before and after the impoundment in the Iguaçu River in the region of Salto Caxias, Paraná State, Brazil. Stomach contents were analysed by the volumetric method. Feeding activity and body condition were inferred by the mean stomach repletion index and the mean condition factor. Typically piscivorous species presented a general tendency of decreased feeding activity and increased condition factor, while opportunistic species, presented a decrease in condition and feeding activity in the most affected sites. The increase in the condition factor of piscivorous fish suggests that these species benefit by the increased abundance of small size prey fish. Some opportunist species that do not have adjustments for the piscivorous diet, regardless of the intensity of consumption and resource availability, can suffer negative reflex when adopting a piscivorous diet.O aumento na abundância de peixes de pequeno porte é comum logo após a formação de um reservatório, levando a um aumento no consumo de peixes, tanto por peixes piscívoros como oportunistas que se aproveitam do recurso abundante. Esse estudo visa avaliar os efeitos da mudança de dieta induzida pelo represamento na atividade alimentar e condição nutricional, tanto de espécies piscívoras (Hoplias aff. malabaricus e Oligosarcus longirostris) quanto de espécies oportunistas (Astyanax lacustris (ex Astyanax altiparanae) e Pimelodus britskii). Para tanto, foram realizadas amostragens nas fases pré e pós-represamento no rio Iguaçu na região de Salto Caxias, Paraná, Brasil. Os conteúdos estomacais foram avaliados pelo método volumétrico. A atividade alimentar foi determinada pelo índice de repleção estomacal e a condição nutricional através do fator de condição relativo. As espécies tipicamente piscívoras apresentaram, em geral, incremento no fator de condição e queda na atividade alimentar e a espécie mais oportunista apresentou queda no fator de condição e índice de repleção nas regiões mais afetadas pelo represamento. O aumento no fator de condição de espécies piscívoras sugere que estas se beneficiam pelo aumento de abundância das espécies de pequeno porte. Enquanto espécies que não possuem adaptações para uma dieta piscívora, independente da intensidade de consumo e disponibilidade desse recurso, podem sofrer reflexos negativos em sua condição nutricional, em detrimento da ausência de pré-adaptações à piscivoria.

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Selecting areas with rare and restricted fish species in mountain streams of Southern Brazil

Frota

Pacífico

Graça

2021

Aquatic Conservation

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The delimitation of conservation units may be supported by information on compositional (taxonomic), functional, and phylogenetic diversity of a given locality or region. In this context, systematic conservation planning and key biodiversity areas are promising approaches for biodiversity protection. Factors such as species representativeness and exclusivity may be used to identify geographical distribution patterns and select relevant areas for conservation at a local scale. This study aims to identify areas with rare and restricted fish species in mountain streams in Southern Brazil, using a method that unites ecological and biogeographical approaches. Seven river basins and 152 mountain streams in Southern Brazil were sampled to obtain data on the occurrence and abundance of 115 fish species. The rarity status of each species was determined and endemicity analysis was used to find areas of restricted species (ARS) with three cell sizes. Using larger cells, continuous areas were identified and supported by a higher proportion of rare fish species. Using smaller cells, discontinuous areas were identified within each of the river basins, where rare and endemic fish species occur. Most of the smaller areas relevant for protecting fish fauna were located outside of conservation units. Fundamental areas were selected for the protection of fish species in mountain streams in Southern Brazil. Both the method proposed and the areas with rare and restricted fish species identified may be used to support systematic conservation planning and to delimit new priority areas for conservation.

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Peixes do baixo rio Iguaçu

Cited by 117 publications

References 14 publications

Ecomorphological differences between Rhamdia (Bleeker, 1858) populations from the Iguaçu River basin

Ecomorphological differences between Rhamdia (Bleeker, 1858) populations from the Iguaçu River basin

Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundances

Selecting areas with rare and restricted fish species in mountain streams of Southern Brazil

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