Estrutura trófica da ictiofauna, ao longo do gradiente longitudinal do reservatório de Salto Caxias (rio Iguaçu, Paraná, Brasil), no terceiro ano após o represamento

Cassemiro, Fernanda Aparecida da Silva; Hahn, Norma Segatti; Delariva, Rosilene Luciana

doi:10.4025/actascibiolsci.v27i1.1362

Cited by 19 publications

(23 citation statements)

References 6 publications

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“…Cassemiro et al (2005) verified that, in Salto Caxias Reservoir, Rhamdia species fed exclusively on fishes after the impoundment, differently from the previous phases when invertebrates and crustaceans were also consumed. Other authors recorded significant differences in diet in the impoundment phases with R. voulezi consuming fishes, and R. branneri feeding on crustaceans and terrestrial insects (LoureiroCrippa & Hahn 2006, Novakowski et al 2007).…”

Section: Discussionmentioning

confidence: 85%

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: Discussionmentioning

confidence: 85%

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

2013

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“…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). Despite the fact that some barriers have ceased to exist in recent history due to the construction of a series of hydroelectric dams (after 1975), it is very likely that population fragmentations may be a consequence of the series of waterfalls that existed previously on the Iguazu river.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2015

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The Iguazu river is a tributary of the left margin of the Paraná river, isolated from this basin about 22 million years ago with the appearance of the Iguazu Falls. The Iguazu river is characterized by high endemism due to two factors: its rugged topography and the old isolation caused by formation of the Iguazu Falls. This study analyzed cytogenetically a population of Glanidium ribeiroi collected in a region at the final stretch of this basin, by Giemsa staining, C-banding, impregnation by silver nitrate, and FISH with probes of 5S rDNA, 18S rDNA, telomeric sequence [TTAGGG] n , and [GATA] n repeats. The diploid number was equal to 58 chromosomes. The heterochromatin was present in the terminal region of almost all chromosomes. The Ag-NORs were simple and presented interstitially on the short arm of the submetacentric pair 14, which was confirmed by FISH with 18S rDNA probe. The 5S rDNA-FISH marked only the submetacentric pair 16 on the long arm in interstitial position. The FISH with [TTAGGG] n probe presented all telomeres labeled as expected, with an absence of Interstitial Telomeric Sequence (ITS). The repetitive [GATA] n sequence was dispersed throughout the genome, with preferential location in the terminal region of all chromosomes. The data obtained are discussed herein with other species of Auchenipteridae, and other previously analyzed populations of G. ribeiroi from the Iguazu river, verifying differences among these populations, which should be mainly related to the rugged topography of this basin.Keywords: geographical barriers, ribosomal DNA, Glanidium ribeiroi, Iguazu river. Variação cariotípica de Glanidium ribeiroi

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“…Therefore, this low nutritional status can make long term maintenance unsustainable if the species continues on the considered diet. Cassemiro et al (2005) observed that this species returned to a herbivorous diet three years after the reservoir was formed, which may explain the maintenance of a large population in the dammed environment.…”

Section: Discussionmentioning

confidence: 97%

“…This was also observed in the present study as the sites that presented the higher increases in prey abundance (DO and RE) also presented the higher increases in piscivorous abundance, as observed for H. aff. malabaricus and O. longirostris, specialist piscivorous (Hahn & Fugi, 2008), that do not change their diet despite environmental changes, and for A. lacustris and P. britskii (opportunist piscivorous), in which the fish consumption was sporadic or even inexistent (Cassemiro et al, 2005;Luz-Agostinho et al, 2006). This increase in specialist piscivorous abundance can be due to the increase in prey availability, that is highlighted by the great participation of forage species as Astyanax dissimilis, Crenicichla spp.…”

Section: Discussionmentioning

confidence: 99%

“…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%

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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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Estrutura trófica da ictiofauna, ao longo do gradiente longitudinal do reservatório de Salto Caxias (rio Iguaçu, Paraná, Brasil), no terceiro ano após o represamento

Cited by 19 publications

References 6 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

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

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

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