A New Aspect on Food Chain Analyses Using N/C Isotope Ratios —Current Perspectives—

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  • Wada Eitaro
    Professor Emeritus, Kyoto University Professor Emeritus, Research Institute of Humanity and Nature JAMSTEC Fellow, Japan Agency for Marine-Earth Science and Technology
  • Noguchi Aita Maki
    Research and Development Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokohama Institute for Earth Sciences

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Other Title
  • 窒素・炭素安定同位体を用いた新食物連鎖解析法—その現状と今後—
  • 安定同位体利用技術 窒素・炭素安定同位体を用いた新食物連鎖解析法 : その現状と今後
  • アンテイ ドウイタイ リヨウ ギジュツ チッソ ・ タンソ アンテイ ドウイタイ オ モチイタ シン ショクモツ レンサ カイセキホウ : ソノ ゲンジョウ ト コンゴ

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Abstract

<p>Remarkable progresses in food chain analyses by using natural abundances of nitrogen and carbon isotopes are reviewed in particular reference to two empirical equations concerning the occurrences of isotope effects of C and N isotopes during feeding processes. We discussed the possible cause for the variability of 3.4±1.1‰ (Δδ15N) for the trophic fractionation of nitrogen isotopes during feeding processes (Empirical equation 1). The trophic effect of nitrogen isotopes was discussed by taking recent progresses on the distribution and variation of nitrogen isotope among amino acids. The empirical equation 2 was expressed as follows: a food chain seems to have comprehensive constant value of Δδ15N/Δδ13C value irrespective of vertebrate and invertebrate along food chains judging from the results obtained from completely different aquatic and land ecosystems. Possible reason on this constant was discussed.</p>

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 66 (9), 331-342, 2017

    Japan Radioisotope Association

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