Feeding Ecology of Leporinus friderici (Teleostei; Anostomidae) in the Upper Tocantins River, Central Brazil, before and after Installation of a Hydroelectric Plant

Albrecht, Martina; Caramaschi, Érica Pellegrini

doi:10.1076/snfe.38.1.33.14033

Cited by 40 publications

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“…In recently formed reservoirs, many species change their food habits at least temporarily (Ferreira et al, 2002;Albrecht & Caramaschi, 2003;Balassa et al, 2004) with the exception of specialist species (Mérona et al 2001;Abujanra & Agostinho, 2002) and those whose preferential food resources either increase (Cassemiro et al, 2003) or remain constant.…”

Section: Discussionmentioning

confidence: 99%

Use of food resources by the fish fauna of a small reservoir (rio Jordão, Brazil) before and shortly after its filling

Loureiro-Crippa

Hahn

2006

Neotrop. ichthyol.

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The construction of dams brings about changes in the course of a river, which directly or indirectly affect the fish fauna. Alterations in the food resources available to the fish favor some species and deter others. In addition to the implications originating from damming, Jordão Reservoir has a characteristically large number of endemic species that, because of the impacts they have undergone, run the risk of extinction. In this study, we investigate the feeding flexibility of the fishes faced with alterations in the food supply through the assessment of the diet and trophic organization of the fish fauna (before and after the damming). Diet was determined analyzing 1,861 stomach contents from 27 fish species. Eight of this species were not caught after the damming. Detrended Correspondence Analysis (DCA) discriminated seven trophic groups. Omnivorous, insectivorous and invertivorous species had more temporal alterations in their diets. These changes altered the composition (in abundance and biomass) of the trophic groups, mainly after the damming. The detritivorous and piscivorous species maintained their diets during all study period. Analyses showed that about 75% of the species quickly changed their diets according to alterations in food supply. This implies that food is not a limiting factor (at first) for the maintenance of fish fauna of this reservoir, at least for the species that persisted after the filling.A construção de reservatórios causa mudanças no curso natural dos rios que afetam direta ou indiretamente a ictiofauna. Alterações na disponibilidade dos recursos alimentares favorecem algumas espécies e prejudicam outras. Além das implicações decorrentes do represamento, o reservatório de Jordão tem como característica um grande número de espécies de peixes endêmicas, que em função dos impactos causados por esse empreendimento, correm risco de extinção. Nesse estudo, nós investigamos como os peixes se comportaram frente às alterações no suprimento alimentar, através da dieta e organização trófica da ictiofauna (antes e após o represamento). Foram analisados 1861 conteúdos estomacais, pertencentes a 27 espécies. Oito dessas espécies não foram mais capturadas após o represamento. Uma análise de correspondência com remoção do efeito do arco (DCA) discriminou sete grupos tróficos. As espécies onívoras, insetívoras e invertívoras apresentaram alterações temporais acentuadas em suas dietas. Essas mudanças alteraram a composição (em abundância e biomassa) dos grupos tróficos, principalmente após o represamento. As espécies detritívoras e piscívoras mantiveram suas dietas durante todo o período de estudos. As análises mostraram que aproximadamente 75% das espécies mudaram rapidamente suas dietas de acordo com as alterações no suprimento alimentar. Este fato permite inferir que o alimento não é um fator limitante para a manutenção das espécies que permaneceram no reservatório de Jordão.

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Section: Discussionmentioning

confidence: 99%

Use of food resources by the fish fauna of a small reservoir (rio Jordão, Brazil) before and shortly after its filling

Loureiro-Crippa

Hahn

2006

Neotrop. ichthyol.

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“…The availability of terrestrial plant material is much reduced in the reservoir but some herbivores maintained populations by preying upon fish. Leporinus friderici and Myleus rhomboidalis have been already known to show a propensity for omnivorous habits (Boujard et al 1990, Albrecht & Caramaschi 2003. Conversely, Myleus ternetzi is strictly folivorous and eats exclusively allochtonous food (Boujard et al 1990 culty to separate partially digested algal material from true detritus in the gut, we included in the detritivore guild two different kinds of species.…”

Section: Discussionmentioning

confidence: 99%

Diet changes in fish species from a large reservoir in South America and their impact on the trophic structure of fish assemblages (Petit-Saut Dam, French Guiana)

Mérona

Vigouroux²

2006

Ann. Limnol. - Int. J. Lim.

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“…O volume das presas foi medido pelo deslocamento da coluna d'água em uma proveta milimetrada. O volume de itens pequenos foi medido em uma placa quadrada de vidro com 1 mm de altura sobre papel milimetrado, conforme descrito em Albrecht & Caramaschi (2003).…”

Section: Metodologiaunclassified

Dinâmica alimentar de Rhaphiodon vulpinus Agassiz, 1829 (Teleostei, Cynodontidae) no alto Rio Tocantins (GO) em relação ao represamento pela UHE Serra da Mesa

et al. 2009

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Abstract:The diet and feeding activity of Rhaphiodon vulpinus were studied before and after the impoundment of the upper Tocantins river by the Serra da Mesa hydroelectric plant (Goiás State, central Brazil), in two areas: reservoir and downstream. Stomach contents of 214 specimens were analyzed: 46 from the river phase (Dec./95 to Oct./96), 100 from the filling phase (Dec./96 to Apr./98) and 68 from the operation phase (Jun./98 to Feb./00). The species was confirmed as a piscivore, with occasional consumption of insects and vegetal material. In the downstream area, none of the identified prey was common to all the three phases. The most consumed prey were Geophagus cf. surinamensis, Hemiodus ternetzi and Pimelodus blochii during the river, filling and operation phases, respectively. The engraulid Anchoviella sp. was exclusive to the operation phase. Prey richness was higher in the reservoir. Small-sized characids were consumed during the three phases, whereas H. ternetzi, Leporinus friderici and Tetragonopterus argenteus were exclusive to the river phase, Ctenobrycon hauxwellianus and Pimelodidae to the filling phase, and Satanoperca aff. jurupari to the operation phase, the latter being the most important in this phase. The feeding activity, given by the proportion of stomachs with food (EcA%) and empty (EV%), increased in each phase in the downstream area. In the reservoir, the opposite pattern was observed. No correlation was found between the sizes of predator and its prey; however, larger predators consumed prey of a wide size range. Keywords: piscivory, Cynodontidae, reservoir, feeding, Tocantins-Araguaia Basin. PACHECO, A.C.G., BARTOLETTE, R., CALUCA, J.F., CASTRO, A.L.M., ALBRECHT, M.P. & CARAMASCHI, E.P. Dinâmica alimentar de Rhaphiodon vulpinus Agassiz, 1829 (Teleostei, Cynodontidae) no alto Rio Tocantins (GO) em relação ao represamento pela UHE Serra da Mesa. Biota Neotrop. 9(3): http://www.biotaneotropica.org.br/v9n3/pt/abstract?article+bn01009032009. Resumo:A dieta e atividade alimentar de Rhaphiodon vulpinus foram estudadas antes e após o represamento do alto Rio Tocantins pela UHE Serra da Mesa, GO, em duas grandes áreas: reservatório e jusante. O conteúdo estomacal de 214 exemplares foi analisado, sendo 46 da fase rio (dez./95 a out./96), 100 da fase enchimento (dez./96 a abr./98) e 68 da fase operação (jun./98 a fev./00). A espécie confirmou-se como piscívora, com consumo eventual de insetos e material vegetal. Na área a jusante, dentre os peixes-presa identificados, nenhum foi comum às três fases. As presas mais importantes foram Geophagus cf. surinamensis, Hemiodus ternetzi e Pimelodus blochii nas fases rio, enchimento e operação, respectivamente. Anchoviella sp. foi exclusiva da fase operação. Já no reservatório, a riqueza de presas foi maior. Caracídeos de pequeno porte foram consumidos nas três fases, ao passo que H. ternetzi, Leporinus friderici e Tetragonopterus argenteus foram exclusivas da fase rio, Ctenobrycon hauxwellianus e Pimelodidae, da fase enchimento, e Satanoperca aff. jurupar...

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Feeding Ecology of Leporinus friderici (Teleostei; Anostomidae) in the Upper Tocantins River, Central Brazil, before and after Installation of a Hydroelectric Plant

Cited by 40 publications

References 0 publications

Use of food resources by the fish fauna of a small reservoir (rio Jordão, Brazil) before and shortly after its filling

Use of food resources by the fish fauna of a small reservoir (rio Jordão, Brazil) before and shortly after its filling

Diet changes in fish species from a large reservoir in South America and their impact on the trophic structure of fish assemblages (Petit-Saut Dam, French Guiana)

Dinâmica alimentar de Rhaphiodon vulpinus Agassiz, 1829 (Teleostei, Cynodontidae) no alto Rio Tocantins (GO) em relação ao represamento pela UHE Serra da Mesa

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