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Combined use of radiocarbon and stable carbon isotopes for the source mixing model in a stream food web
Limnology and Oceanography ( IF 4.5 ) Pub Date : 2020-07-06 , DOI: 10.1002/lno.11541
Naoto F. Ishikawa 1 , Jacques C. Finlay 2 , Hiromi Uno 3, 4 , Nanako O. Ogawa 1 , Naohiko Ohkouchi 1 , Ichiro Tayasu 5 , Mary E. Power 3
Affiliation  

Radiocarbon natural abundance (Δ14C) has emerged as a useful dietary tracer in freshwater ecology for the past decade, yet its applicability for separating aquatic and terrestrial resources has not been examined quantitatively. Here, we report Δ14C values of stream invertebrates in different functional feeding groups collected from the upper South Fork Eel River watershed, northern California. We found that algae‐grazing insect larvae show low Δ14C values (−43.1 ± 21.8‰, mean ± standard deviation, N = 6), reflecting the signal of dissolved inorganic carbon weathered from ancient inorganic carbon or respiration of old organic carbon. In contrast, the Δ14C values of leaf‐shredding insect larvae (21.7 ± 31.9‰, N = 5) were close to those of contemporary atmospheric CO2 except at the SF Eel River where algal production was highest. The Δ14C values of predators (−6.1 ± 35.7‰, N = 14) were intermediate between those of grazers and shredders. In a Bayesian mixing model, Δ14C provided a more ecologically realistic estimate for terrestrial vs. aquatic source contributions to invertebrates with lower uncertainty (i.e., narrower credible interval) than did the stable carbon isotopes (δ13C). These results demonstrate that Δ14C can be used, in combination with δ13C, to more precisely estimate organic matter sources to stream animals.

中文翻译:

放射性碳和稳定碳同位素联合用于流食网中的源混合模型

放射性碳天然丰度(Δ 14 C)已经成为在淡水生态学的有用的膳食示踪剂在过去的十年,但其用于分离水生和陆生资源适用性尚未定量检查。在这里,我们报告了从北加利福尼亚南叉鳗河流域收集的不同功能性饲料组中的无脊椎动物溪流的14 C值。我们发现,藻类放牧昆虫幼虫显示低Δ 14 C值(-43.1±21.8‰,平均值±标准偏差,Ñ  = 6),反映溶解的无机碳的信号从古代无机碳的或旧的有机碳的呼吸风化。相反,Δ 14叶切碎昆虫幼虫的(C值21.7±31.9‰,N  = 5)接近当代大气中的CO 2,但在SF Eel河中藻类产量最高。的Δ 14天敌的C值(-6.1±35.7‰,Ñ  = 14)是那些食草动物和粉碎机的之间的中间。在贝叶斯模型混合,Δ 14 C规定需脊椎动物陆地与水生来源的贡献与比没有稳定的同位素碳较低的不确定性(即,较窄的可信区间)一个更加生态实际的估计(δ 13 C)。这些结果证明,Δ 14 C可用于,结合δ 13 C,以更精确地估计有机物的来源以流动物。
更新日期:2020-07-06
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