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タイトル: | Stable nitrogen isotopic composition of amino acids reveals food web structure in stream ecosystems. |
著者: | Ishikawa, Naoto F Kato, Yoshikazu Togashi, Hiroyuki Yoshimura, Mayumi Yoshimizu, Chikage Okuda, Noboru ![]() Tayasu, Ichiro |
著者名の別形: | 石川, 尚人 |
キーワード: | Periphyton Terrestrial C3 litter Aquatic animals Compound-specific isotope analysis Two-source mixing model |
発行日: | Jul-2014 |
出版者: | Springer Berlin Heidelberg |
誌名: | Oecologia |
巻: | 175 |
号: | 3 |
開始ページ: | 911 |
終了ページ: | 922 |
抄録: | The stable N isotopic composition of individual amino acids (SIAA) has recently been used to estimate trophic positions (TPs) of animals in several simple food chain systems. However, it is unknown whether the SIAA is applicable to more complex food web analysis. In this study we measured the SIAA of stream macroinvertebrates, fishes, and their potential food sources (periphyton and leaf litter of terrestrial C3 plants) collected from upper and lower sites in two streams having contrasting riparian landscapes. The stable N isotope ratios of glutamic acid and phenylalanine confirmed that for primary producers (periphyton and C3 litter) the TP was 1, and for primary consumers (e.g., mayfly and caddisfly larvae) it was 2. We built a two-source mixing model to estimate the relative contributions of aquatic and terrestrial sources to secondary and higher consumers (e.g., stonefly larva and fishes) prior to the TP calculation. The estimated TPs (2.3-3.5) roughly corresponded to their omnivorous and carnivorous feeding habits, respectively. We found that the SIAA method offers substantial advantages over traditional bulk method for food web analysis because it defines the food web structure based on the metabolic pathway of amino groups, and can be used to estimate food web structure under conditions where the bulk method cannot be used. Our result provides evidence that the SIAA method is applicable to the analysis of complex food webs, where heterogeneous resources are mixed. |
著作権等: | The final publication is available at Springer via http://dx.doi.org/10.1007/s00442-014-2936-4. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/199595 |
DOI(出版社版): | 10.1007/s00442-014-2936-4 |
PubMed ID: | 24719209 |
出現コレクション: | 学術雑誌掲載論文等 |
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