Stable isotopic structure of aquatic ecosystems |
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Authors: | Eitaro Wada Yuko Kabaya Yasushi Kurihara |
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Institution: | (1) Mitsubishi Kasei Institute of Life Sciences, 11 Minamiooya, Machida, 194 Tokyo, Japan;(2) Biological Institute, Tohoku University, 980 Sendai, Japan;(3) Center for Ecological Research, Kyoto University, 4-1-23 Shimosakamoto, Otsu, 520-01 Shiga, Japan;(4) Ohu University, 31-1, Sankakudoh, Tomita, Kooriyama, 963 Fukushima, Japan |
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Abstract: | Isotopic, biogeochemical and ecological structure can provide a new dimension for understanding material flows, and the simultaneous
function and structure of an ecosystem. Distributions ofδ
13C andδ
15N for biogenic substances in the Nanakita river estuary involving Gamo lagoon in Japan were investigated to construct isotope
biogeochemical and ecological structure for assessing fate and transfer of organic matter, and food web structure. The isotopic
framework of the ecosystem was successfully described in aδ
15N–δ
13C map. In this estuary the variations of isotope ratios of biogenic substances were clearly explained by the mixing of land-derived
organic matter, and marine-derived organic matter.
A trophic-level effect of15N enrichment was clearly observed. Organisms were classified into three groups depending upon the contribution of land-derived
organic matter in a food chain. Almost all biota except mollusca in the lagoon depend on organic matter of marine origin.
The contributions of both land and marine organic matter were comparable for mollusca in the lagoon. |
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Keywords: | Nitrogen isotope carbon isotope food web analysis estuary lagoon watershed |
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