Food resources used by three species of fish in the semi-arid region of Brazil

Temporary and semi-permanent aquatic habitats in semi-arid Brazil have been reported as important sites supporting a diverse fish fauna. As such, they must be able to trophically sustain fish species that feed at different trophic levels. This study aims to describe the diets of Astyanax aff. bimacu...

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Veröffentlicht in:Neotropical ichthyology 2010-12, Vol.8 (4), p.825-833
Hauptverfasser: Silva, MJ, Figueiredo, BRS, Ramos, RTC, Medeiros, ESF
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Sprache:eng
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Zusammenfassung:Temporary and semi-permanent aquatic habitats in semi-arid Brazil have been reported as important sites supporting a diverse fish fauna. As such, they must be able to trophically sustain fish species that feed at different trophic levels. This study aims to describe the diets of Astyanax aff. bimaculatus, Hoplias malabaricus and Prochilodus brevis in aquatic systems in semi-arid Brazil, providing evidence of the importance of these habitats as supporters of large consumers like fish. The diet of the three species studied was diverse, feeding on a range of food items, from microalgae to fish. Despite that, a few items were more important to each of the study species. These results and the relatively high rates of stomach fullness indicate that a diverse and abundant food range is available in the study sites, but species seem to select some food resources. The present study provides evidence that despite being highly variable, intermittent and semi-permanent aquatic systems in semi-arid Brazil are able to trophically sustain large consumersOriginal Abstract: Os ambientes aquaticos temporarios e semi-permanentes do semiarido brasileiro tem sido mostrados como importantes sitios que possuem uma diversa fauna de peixes. Desta forma, esses ambientes devem ser capazes de sustentar, do ponto de vista trofico, populacoes de peixes que se alimentam em diversos niveis troficos. O presente estudo tem como objetivo descrever o habito alimentar de Astyanax aff. bimaculatus, Hoplias malabaricus e Prochilodus brevis em ambientes aquaticos do semiarido brasileiro, fornecendo evidencias da importancia desses habitats para manutencao da diversidade de consumidores como os peixes. A composicao da dieta das especies estudadas foi diversificada, ja que alimentaram-se de uma variedade de classes de itens, desde microalgas ate peixes. Apesar disso, alguns itens foram mais importantes para cada uma das tres especies. Estes resultados, e as altas taxas de replecao dos estomagos, indicam que um abundante e diverso conjunto de itens alimentares esta disponivel nos ambientes estudados, embora as especies tendam a selecionar alguns itens em detrimento de outros. Este estudo fornece evidencia de que, apesar de altamente variaveis, sistemas aquaticos intermitentes e semi-permanentes do semiarido brasileiro sao capazes de sustentar, do ponto de vista trofico, consumidores de topo
ISSN:1679-6225
1982-0224