Dissolved carbon dioxide concentration controls baseline stable carbon isotope signatures of a lake food web
Dissolved carbon dioxide concentration controls baseline stable carbon isotope signatures of a lake food web
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DOI：
10.4319/lo.2012.57.5.1292
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发表时间：
2012-09
影响因子：
4.5
通讯作者：
Peter M. Smyntek;S. Maberly;J. Grey
中科院分区：
文献类型：
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作者：
Peter M. Smyntek;S. Maberly;J. Grey
一个经过充分研究的多产湖泊的基线稳定碳同位素（δ 13 C）值的时间变化在26年的时间内进行了检查，使用草食动物浮游植物Daphnia galeata的存档样本作为代理，因为它的浮游植物饮食。基线δ 13 C值与湖泊pH值和溶解二氧化碳浓度以及捕食性动物的δ 13 C值密切相关。同位素分馏模型结合藻类生理学（生长速率，表面积，和碳含量的主要浮游植物物种）和溶解的二氧化碳浓度在湖泊中被用来预测，成功地，在研究期间，湖泊的基线δ 13 C值。在溶解的二氧化碳浓度随时间变化的水生生态系统中，通过考虑CO2浓度可以更清楚地确定基线δ 13 C值。这种方法将使食物网关系更准确地量化。
Temporal variation in the baseline stable carbon isotope (δ13C) value of a well‐studied, productive lake was examined over a 26‐yr period using archived samples of the herbivorous zooplankter Daphnia galeata as a proxy because of its phytoplankton diet. The baseline δ13C value was strongly correlated with pH and the concentration of dissolved carbon dioxide in the lake as well as with the δ13C value of a predatory zooplankter. An isotopic fractionation model incorporating algal physiology (the growth rate, surface area, and carbon content of the main phytoplankton species) and the dissolved carbon dioxide concentration in the lake was used to predict, successfully, the baseline δ13C values of the lake over the study period. In aquatic ecosystems where the concentration of dissolved carbon dioxide is temporally variable, the baseline δ13C value can be more clearly defined by taking the concentration of CO2 into account. This approach will allow food web relationships to be quantified more accurately.