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Isotopic trophic-step fractionation of the freshwater clam Corbicula sandai

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タイトル: Isotopic trophic-step fractionation of the freshwater clam Corbicula sandai
著者: Kasai, Akihide 著作を一覧する
Ishizaki, Daisuke 著作を一覧する
Isoda, Takane 著作を一覧する
キーワード: Bivalve
Clam
Diet
Fractionation
Stable isotope
Laboratory experiment
発行日: 2016年 5月
出版者: Springer
誌名: Fisheries science
巻: 82
号: 3
開始ページ: 491
終了ページ: 498
出版社 DOI: 10.1007/s12562-016-0970-3
抄録: Diet-switch experiments with three different species of microalgae were conducted to estimate diet-tissue isotopic fractionation of carbon (C) and nitrogen (N) isotopes in the freshwater clam Corbicula sandai. The delta C-13 and delta N-15 values in the soft tissues of C. sandai changed in each experiment, with little inter-individual deviations, thereby reflecting the switch in diet. Isotope values of the clam reached the asymptotic value at around 40 days after the switch. Equilibrium isotopic signatures, as well as turnovers of carbon and nitrogen in the whole soft tissues, were estimated by exponential decay models. Fractionations for C. sandai varied from 0.1 to 0.7 aEuro degrees for carbon, and from 2.1 to 3.6 aEuro degrees for nitrogen; these values fell within or were close to the range of previously accepted fractionation values (0-1 aEuro degrees for carbon and 3-4 aEuro degrees for nitrogen). The half-life values for carbon in the bivalves (12-22 days) were about twofold longer than those for nitrogen (7-9 days). The specific fractionation values estimated in this study contribute towards improving our understanding of inter-specific trophic relationships and aquatic food webs.
Rights: The final publication is available at www.springerlink.com via http://dx.doi.org/10.1007/s12562-016-0970-3
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/65190
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 笠井 亮秀

 

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