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The Origin of Food Sources for Nuttallia olivacea and Nereidae by Fatty Acid Analysis

지방산을 이용한 Nuttallia olivacea 및 Nereidae의 먹이원에 관한 연구

  • Shin, Woo-Seok (Graduate school of Engineering Department of Ecological Engineering, Tohoku University) ;
  • Kim, Boo-Gil (Department of Civil and Environmental Engineering, Dongseo University)
  • 신우석 (일본 동북대학 대학원 공학연구과 환경생태공학 연구실) ;
  • 김부길 (동서대학교 건축.토목공학부 토목공학과)
  • Received : 2010.02.01
  • Accepted : 2010.08.12
  • Published : 2010.09.30

Abstract

The spatial variability in the food chain structure of an estuary environment (Nanakita estuary, Japan) was investigated using fatty acid. Potential organic matter sources (terrestiral plants, macroalgae, benthic microalgae, dinflagellates and bacteria), sedimentary organic matters and benthic invertebrates (Nuttallia olivacea and Nereidae) were sampled in four locations with different tidal flat type. The main objective of the present study was to determine the origin of sediment and the food sources of N. olivacea and Nereidae along with small-scale spatial variability. The origin of sedimentary organic matters were mainly the fatty acid of bacteria and benthic microalgae. Especially, The organic matter of terrestrial plant origin was found the highest in station C. The diets of N. olivacea and Nereidae were found to be dominated by diatoms and terrestrial plants. Whereas, macroalgae and dinoflagellates showed little influence to benthic invertebrates. Moreover, according to principal component analysis, it is showed that benthic invertebrates in the same region are using the same food without relation with species. On the other hand, the N. olivacea and Nereidae of station D clearly contrasts with station B in terms of main food sources. From these results, it is suggested that food competition of benthic invertebrates revealed high a connection between small-scale spatial variability and food source in estuary.

Keywords

Estuary;Food chain;Organic matter;Benthos;Fatty acid biomarkers;Intertidal flat

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