Published 2017 | Version v1
Journal article Metadata-only

A new aspect on food chain analyses using N/C isotope ratios. Current perspectives

Creators

  • 1. Professor Emeritus, Kyoto University, Kyoto (Japan)
  • 2. Japan Agency for Marine-Earth Science and Technology, Yokohama Institute for Earth Sciences, Yokohama, Kanagawa (Japan)

Description

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. (author)

Availability note (English)

Available from DOI: https://doi.org/10.3769/radioisotopes.66.331

Abstract (Japanese)

我が国で著しい進展のあったδ15N, δ13Cを用いた窒素・炭素安定同位体精密測定法(SI法)による食物網解析法の進捗についてまとめた。特に,食物連鎖に見出された,窒素・炭素同位体効果に関する二つの経験則に注目し,近年のアミノ酸レベルの δ15Nに関する成果を考慮に入れて,その成立の境界条件を考察した。経験則1:栄養段階(TL)が1段階上がるごとに3.4±1.1‰高くなる事が過去の研究で示されている。この経験則は動物の筋肉タンパクについて得られているが,±1.1‰の変動について本稿で考察した。経験則2:海洋と陸域の代表的な食物連鎖について,窒素・炭素同位体効果の比(Δδ15N/Δδ13C)が動物の種類に関わらず,ほぼ一定であることが示唆されている。一般的に,食物連鎖に沿ってδ15Nは δ13Cと統計的に有意な回帰直線の関係を示す。この関係の成り立ちの可能性について代謝系の共通性から考察した。(著者)

Additional details

Additional titles

Original title (Japanese)
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

Identifiers

DOI
10.3769/radioisotopes.66.331;

Publishing Information

Journal Title
Radioisotopes (Online)
Journal Volume
66
Journal Issue
9
Journal Page Range
p. 331-342
ISSN
1884-4111

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
52100587
Subject category
S60: APPLIED LIFE SCIENCES;
Descriptors DEI
AMINO ACIDS; CARBON 13; CONCENTRATION RATIO; FOOD CHAINS; GAS CHROMATOGRAPHY; INTERNATIONAL COOPERATION; ISOTOPE EFFECTS; ISOTOPE RATIO; NITROGEN 15; PLANKTON; REGRESSION ANALYSIS
Descriptors DEC
AQUATIC ORGANISMS; CARBON ISOTOPES; CARBOXYLIC ACIDS; CHROMATOGRAPHY; COOPERATION; DIMENSIONLESS NUMBERS; EVEN-ODD NUCLEI; ISOTOPES; LIGHT NUCLEI; MATHEMATICS; NITROGEN ISOTOPES; NUCLEI; ODD-EVEN NUCLEI; ORGANIC ACIDS; ORGANIC COMPOUNDS; SEPARATION PROCESSES; STABLE ISOTOPES; STATISTICS

Optional Information

Notes
36 refs., 10 figs.