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The diet of cubomedusae (cnidaria, cubozoa) in southern Brazil

Abstracts

The diet of cubomedusae Tamoya haplonema Müller, 1859 (Carybdeidae) and Chiropsalmus quadrumanus (Müller, 1859) (Chirodropidae) was examined in specimens collected on the Southern Brazilian coast (25º20' - 25º55'S; 48º10' - 48º35'W), between December 1998 and December 2004. This is the first study to analyze this biological aspect in cubomedusae from the South Atlantic. The gastrovascular cavities of most (55%; n = 29) specimens of T. haplonema were empty while the remainder had teleosteans parts such as scales, vertebrae and otoliths. In C. quadrumanus (n = 726), the most important items were the pelagic sergestid shrimp Peisos petrunkevitchi Burkenroad, 1945 and Brachyura larvae, mainly megalops. Small crabs, isopods, fish, fish eggs and nematodes were less common. A dietary shift was clearly observed during C. quadrumanus growth. Smaller individuals consumed a greater variety of prey, mostly Brachyura larvae, and they also had higher frequencies of empty stomachs. As their size increased, megalopas decreased and P. petrunkevitchi became the most important item in their diet.

Chiropsalmus quadrumanus; Feeding biology; Jellyfish; Medusae; Ontogenetic dietary shift; Tamoya haplonema


A dieta das cubomedusas Tamoya haplonema Müller, 1859 (Carybdeidae) e Chiropsalmus quadrumanus (Müller, 1859) (Chirodropidae) foi analisada em espécimes coletados no litoral do Paraná (25º20' - 25º55'S; 48º10' - 48º35'W), sul do Brasil, entre dezembro de 1998 e dezembro de 2004, e é o primeiro estudo a abordar este aspecto da biologia de Cubozoa no Atlântico Sul. A cavidade gastrovascular da maioria (55%) dos 29 exemplares de T. haplonema mostrou-se vazia, e dos demais continha partes corporais de peixes teleósteos, como escamas, vértebras e otólitos. Em 726 exemplares de C. quadrumanus os itens alimentares mais importantes foram o camarão sergestídeo Peisos petrunkevitchi Burkenroad, 1945 e larvas de Brachyura, principalmente megalopas. Pequenos caranguejos, isópodes, peixes, ovos de peixes e nematóides foram menos comuns. Mudanças na dieta evidenciaram-se durante o crescimento de C. quadrumanus. Indivíduos menores alimentaram-se de maior variedade de presas, principalmente de larvas de Brachyura, e também apresentaram freqüência mais alta de estômagos vazios. À medida que cresciam, a ingestão de larvas diminuía de importância enquanto a do camarão P. petrunkevitchi aumentava, até este se tornar o principal item na dieta da espécie.

Água-viva; Biologia alimentar; Chiropsalmus quadrumanus; Medusa; Mudança ontogenética; Tamoya haplonema


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Publication Dates

  • Publication in this collection
    25 Sept 2008
  • Date of issue
    Sept 2008

History

  • Accepted
    12 Dec 2007
  • Received
    24 Oct 2005
  • Reviewed
    05 May 2006
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