Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Latitudinal Variation of Nutritional Condition and Diet for Copepod Species, Euchaeta sp. and Pleuromamma spp., from the Northwest Pacific Ocean Using Lipid Biomarkers

지방 바이오마커를 활용한 북서태평양에서 요각류(Euchaeta sp. and Pleuromamma spp.)의 서식 위도별 영양상태 및 먹이원 연구

  • Ju, Se-Jong (Deep-sea and Marine Georesources Research Department, KORDI) ;
  • Ko, Ah-Ra (Deep-sea and Marine Georesources Research Department, KORDI) ;
  • Lee, Chang-Rae (National Park Research Institute, Korea National Park Service)
  • 주세종 (한국해양연구원 심해해저자원연구부) ;
  • 고아라 (한국해양연구원 심해해저자원연구부) ;
  • 이창래 (국립공원관리공단 국립공원연구원)
  • Received : 2011.07.13
  • Accepted : 2011.09.01
  • Published : 2011.09.30
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Abstract

In order to ascertain latitudinal variation of lipid contents and compositions in copepods, we collected warm water copepod species (Euchaeta sp. and Pleuromamma spp.) from four different regions from low (sub-tropical) to mid (temperate) latitudes in the Northwest Pacific Ocean. Total lipid contents of Pleuromamma spp. were about 11 $ug{\cdot}ind^{-1}$ with little latitudinal variation, whereas Euchaeta sp. showed slightly higher lipid content (20 $ug{\cdot}ind^{-1}$) than Pleuromamma spp. with latitudinal gradient (low at subtropic and high at temperate). Wax esters, known as the major storage lipid classes, were found to be the dominant lipid classes (accounting for more than 35% of total lipids) in Euchaeta sp., whereas in Pleuromamma spp., phospholipids, known as cellular membrane components, were the dominant lipid classes. However, the exception was specimens from warm pool region exhibiting dominance in storage of lipids as a form of triacylglycerols. Among fatty acids, polyunsaturated fatty acids (PUFA), especially docosahexaenoic acid (DHA : 22:6(n-3)) (about 35% of total fatty acids), were most abundant in Euchaeta sp., while saturated fatty acids (SAFA), specially hexadecanoic acid (16:0) (about 30% of total fatty acids), were most abundant in Pleuromamma spp.. Among the neutral fraction of lipids, phytol, originated from the side chain of chlorophyll, was found in all samples which generally indicate active copepods feeding on algae. While only trace amounts of short-chain fatty alcohols were found in Pleuromamma spp., significant amounts of fatty alcohols were found in Euchaeta sp.. Particularly, significant amounts of long chain monounsaturated fatty alcohols (20:1 and 22:1), generally found in cold water species, were found in Euchaeta sp. from low latitudes. The latitudinal variation of trophic lipid markers in these copepods could be significantly related with in-situ food availability and species-specific diet preference. The result of this study suggests that the lipid contents and compositions in copepods may not only indicate their nutritional condition and feeding ecology but also provide insight into species-specific living strategies under different environmental conditions (i.e. water temperature, food availability).

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