Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Comparisons of Feeding Ecology of Euphausia pacifica from Korean Waters Using Lipid Composition

한국 근해의 난바다곤쟁이 Euphausia pacifica의 지방 조성에 의한 섭식 생태 비교

  • Kim, Hye-Seon (Deep-Sea & Marine Georesources Research Department, KORDI) ;
  • Ju, Se-Jong (Deep-Sea & Marine Georesources Research Department, KORDI) ;
  • Ko, Ah-Ra (Deep-Sea & Marine Georesources Research Department, KORDI)
  • 김혜선 (한국해양연구원 심해해저자원연구부) ;
  • 주세종 (한국해양연구원 심해해저자원연구부) ;
  • 고아라 (한국해양연구원 심해해저자원연구부)
  • Received : 2010.05.06
  • Accepted : 2010.06.15
  • Published : 2010.06.30
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Abstract

Dietary lipid biomarkers (fatty acids, fatty alcohols, and sterols) in adult specimens were analyzed to compare and understand the feeding ecology of the euphausiid, Euphausia pacifica, from three geographically and environmentally diverse Korean waters (Yellow Sea, East China Sea, and East Sea). Total lipid content of E. pacifica from Korean waters was about 10% dry weight (DW) with a dominance of phospholipids (>46.9% of total lipid content), which are known as membrane components. A saturated fatty acid, C16:0, a monounsaturated fatty acid, C18:1(n-9), and two polyunsaturated fatty acids, C20:5(n-3) and 22:6(n-3), were most abundant (>60% of total fatty acids) in the fatty acid composition. Some of the fatty acids showed slight differences among regions although no significant compositional changes of fatty acids were detected between these regions. Phytol, originating from the side chain of chlorophyll and indicative of active feeding on phytoplankton, was detected all samples. Trace amounts of various fatty alcohols were also detected in E. pacifica. Specifically, krill from the Yellow Sea showed relatively high amounts of longchain monounsaturated fatty alcohols (i.e. 20:1 and 22:1), generally found in herbivorous copepods. Three different kinds of sterols were detected in E. pacifica. The most dominant of these sterols was cholest-5-en-$3{\beta}$-ol (cholesterol). The lipid compositions and ratios of fatty acid trophic markers are indicative of herbivory in E. pacifica from the Yellow Sea and East Sea (mainly feeding on dinoflagellates and diatoms, respectively). The lipid compositions and ratios of fatty acid trophic markers are indicative of carnivory or omnivory in E. pacifica from the East China Sea, mainly feeding on microzooplankton such as protozoa. In conclusion, lipid biomarkers provide useful information about krill feeding type. However, further analyses and experiments (i.e. gut content analysis, in situ grazing experiment, etc.) are needed to better understand the feeding ecology of E. pacifica in various marine environments.

Keywords

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