15N and 13C Abundances in Marine Environments with Emphasis on Biogeochemical Structure of Food Web
15N and 13C Abundances in Marine Environments with Emphasis on Biogeochemical Structure of Food Web
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海洋环境中 15N 和 13C 丰度，重点关注食物网的生物地球化学结构
DOI：
10.1080/10256018708623831
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
E. Wada
中科院分区：
文献类型：
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作者：
E. Wada
为建立评价海洋生态系统的同位素生物地球化学框架，研究了南极海洋和日本大石河河口生源物质中δ15N和δ13C的分布。南极海域浮游植物的同位素组成特别低。表层海水中的高硝酸盐浓度和高二氧化碳浓度以及低光照强度似乎增加了藻体中15N和13C的动态同位素分馏。在南极系统中，动物δ15N与其营养水平之间存在明显的线性关系。在河口，同位素比值的变化主要受陆源有机质、海洋浮游植物和海草的混合影响。同时也证实了15N的食物链效应。提出了一种海洋河口生态系统的同位素有序结构。食物网中同位素丰度的变化主要是由于15N和13C含量的变化。
Distributions of δ15N and δ13C for biogenic substances in the Antarctic Ocean and in the Otsuchi River estuary in Japan were investigated to construct isotope biogeochemical framework for assessing marine ecosystems. The isotopic compositions of phytoplankton were particularly low in the Antarctic Ocean. High nitrate concentration and high PCO2 in the surface sea waters, and the low light intensity seem to enhance the kinetic isotope fractionations that preferred the depletion of 15N and 13C in the algal body A clear-cut linear relationship between animal δ15N and its trophic level was obtained in the Antarctic system. In the estuary, the variation of isotope ratios were principally governed by the mixing of land-derived organic matter, marine phytoplankton, and seagrasses. A food-chain effect of 15N enrichment was also confirmed. An isotopically ordered structure was presented for a marine estuarine ecosystem. The isotopic abundances in a food web vary mainly because of the variation in 15N and 13C conte...