Utilization of terrestrial organic matter by the bivalve Corbicula japonica estimated from stable isotope analysis
Utilization of terrestrial organic matter by the bivalve Corbicula japonica estimated from stable isotope analysis
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DOI：
10.1111/j.1444-2906.2005.00942.x
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发表时间：
2005-02
影响因子：
1.9
通讯作者：
A. Kasai;Akiko Nakata
中科院分区：
文献类型：
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作者：
A. Kasai;Akiko Nakata
在日本串田河口，测量了沿着盐度梯度分布的双壳贝类corbicula（Corbicula japonica）和颗粒有机物（POM）的碳、氮同位素比值。双壳类的同位素组成从最高的河口位置（σ 13 C =−24.8‰，σ 15 N =8.6‰）到海洋位置（σ 13 C =−16.1‰，σ 15 N =11.8‰）逐渐富集。利用浓度加权混合模型，根据双壳类的同位素值和来自陆生植物、海洋浮游植物和底栖微藻的POM值估算了双壳类的食物来源。结果表明，底栖微藻和浮游植物的贡献很小，而陆地颗粒物是显着重要的蚬饲料，虽然不同采样点的贡献。
Carbon and nitrogen isotopic ratios in tissue of the bivalve corbicula (Corbicula japonica) and particulate organic matter (POM) were measured along a salinity gradient in the Kushida Estuary, Japan. The bivalve exhibited a gradual isotopic enrichment from the uppermost estuarine site (σ13C=−24.8‰ and σ15N=8.6‰) to the marine site (σ13C=−16.1‰ and σ15N=11.8‰). Using the concentration-weighted mixing model, the bivalves’ food source is estimated from the isotope values for the bivalves and POM from terrestrial plants, marine phytoplankton and benthic microalgae. The results indicated that the contributions of benthic micro algae and phytoplankton were small, while terrestrial particulate matter is significantly important for the corbicula diet, although the contribution varies among sampling sites.