Ocean Science Journal

  • 제43권1호
  • /
  • Pages.61-65
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  • 2008
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  • 1738-5261(pISSN)
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  • 2005-7172(eISSN)
한국해양학회 (The Korean Society of Oceanography)
권호 표지

Description of Feeding Apparatus and Mechanism in Nemopilema nomurai Kishinouye (Scyphozoa: Rhizostomeae)

  • Lee, Hye-Eun (Ocean Environment Headquarter, National Fisheries Research and Development Institute) ;
  • Yoon, Won-Duk (Ocean Environment Headquarter, National Fisheries Research and Development Institute) ;
  • Lim, Dong-Hyun (Ocean Environment Headquarter, National Fisheries Research and Development Institute)
  • 발행 : 2008.03.30
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초록

Feeding apparatus, mechanism and passage of ingested prey were described for Nemopilema nomurai (Scyphozoa: Rhizostomeae). N. nomurai medusae without central mouths have developed complicated canal systems connecting the tip of the tentacle and oral arm to the gut cavity. The number of junctions in the canal system increases with the bell diameter. The prey is gathered by paralyzing nematocyst at the tentacles and by adhering cirri at the oral arms and scapulets. They are engulfed into the terminal pore located at the oral arms and scapulets, and entered into the gut cavity via the canal system. The estimated digestion time is 1 hour and 20 min. The diameter of terminal pore is always about 1 mm, implying that they could not eat prey larger than that pore size. On the other hand, ephyrae have central mouths and could swallow prey as large as adults could. Exploitation of the same size of food by adult and ephyra implies that N. nomurai can affect seriously the whole food web, massively ingesting micro- and mesozooplankton and cutting the energy transfer toward the higher level of carnivores.

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