Ontogenetic variations and feeding habits of a Neotropical annual fish from southern Brazil

Conhecer a biologia alimentar de uma populacao e seus aspectos ontogeneticos podem auxiliar na compreensao do funcionamento de assembleias de peixes, fundamental para a conservacao da biodiversidade do habitat no qual estas especies sao encontradas. Peixes anuais completam seu ciclo de vida em ambientes aquaticos temporarios, sendo encontrados no estagio adulto somente em breves periodos anuais. Mudancas nos habitos alimentares entre diferentes classes de tamanho podem indicar que uma especie pertence a distintos grupos alimentares nas diferentes fases do crescimento. Este trabalho teve como objetivo caracterizar a dieta de Cynopoecilus fulgens Costa, 2002 em uma area temporariamente alagada na planicie costeira sul-riograndense, levando em consideracao possiveis alteracoes nos habitos alimentares nas diferentes classes de tamanho corporal causadas por mudancas ontogeneticas, visando explicar a coexistencia destes individuos em um curto espaco de tempo. A analise da dieta indica que C. fulgens e uma especie generalista, ingerindo pequenos crustaceos e insetos autoctones. Diferencas intraespecificas na composicao da dieta foram verificadas quando comparadas entre as nove classes de comprimento padrao estabelecidas. Adultos se alimentaram principalmente de insetos autoctones, enquanto os juvenis ingeriram principalmente crustaceos, sendo a populacao separada em dois grupos troficos: invertivoros e invertivoros com tendencia a zooplanctivoria. E possivel concluir que as mudancas ontogeneticas na dieta de C. fulgens estejam relacionadas a restricoes morfologicas decorrentes do tamanho dos individuos, ja que as relacoes competitivas, em termos alimentares, nao sao aparentemente tao evidentes.

• Publication year

  2017

• Venue

  Iheringia Serie Zoologia

• Publication date

  Unknown publication date

• Fields of study

  Not labeled

• Identifiers
  DOI 10.1590/1678-4766E2017020
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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