Exploring source differences on diet-tissue discrimination factors in the analysis of stable isotope mixing models.
Exploring source differences on diet-tissue discrimination factors in the analysis of stable isotope mixing models.
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DOI：
10.1038/s41598-020-73019-x
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发表时间：
2020-09-25
影响因子：
4.6
通讯作者：
Booth AJ
中科院分区：
文献类型：
--
作者：
Kadye WT;Redelinghuys S;Parnell AC;Booth AJ
稳定同位素混合模型经常用于提供对膳食混合物源贡献的概率估计。虽然同位素混合模型的贝叶斯实现已经变得突出，但适当的饮食-组织区分因子（dtdf）的使用仍然是解决得最少的方面。dtd对于从这些模型中提供准确的推断是至关重要的。本研究利用模拟和实验室实验数据，通过探索dtdf的作用，为同位素混合模型提供了概念和实际应用。实验研究利用淡水鱼莫桑比克罗非鱼（Mozambique Tilapia Oreochromis mossambicus）探索了同位素掺入模式的多组织变化，并基于实验和文献的dtdf评估了同位素混合模型的输出。在不同稳定同位素来源的饮食中，肌肉和鳍组织的同位素掺入模式是不同的。基于文献的dtdf在同位素混合模型中的应用一直低估了所有单一来源消费者群体的膳食比例。相比之下，应用饮食特异性ddf为单一来源消费者群体提供了更好的饮食估计。然而，在混合来源的消费者群体中，观察到个体来源的比例贡献存在差异，这表明个体食物来源的同位素同化可能受到其他潜在生理过程的影响。这项研究提供的证据表明，来自不同饮食来源的稳定同位素值在被纳入消费者组织时表现出很大的变化。这表明，同位素混合模型的应用需要考虑几个方面，如饮食类型和可能影响ddf的相关生物过程。
Stable isotope mixing models are regularly used to provide probabilistic estimates of source contributions to dietary mixtures. Whilst Bayesian implementations of isotope mixing models have become prominent, the use of appropriate diet-tissue discrimination factors (DTDFs) remains as the least resolved aspect. The DTDFs are critical in providing accurate inferences from these models. Using both simulated and laboratory-based experimental data, this study provides conceptual and practical applications of isotope mixing models by exploring the role of DTDFs. The experimental study used Mozambique Tilapia Oreochromis mossambicus, a freshwater fish, to explore multi-tissue variations in isotopic incorporation patterns, and to evaluate isotope mixing model outputs based on the experiment- and literature-based DTDFs. Isotope incorporation patterns were variable for both muscle and fin tissues among the consumer groups that fed diet sources with different stable isotope values. Application of literature-based DTDFs in isotope mixing models consistently underestimated the dietary proportions of all single-source consumer groups. In contrast, application of diet-specific DTDFs provided better dietary estimates for single-source consumer groups. Variations in the proportional contributions of the individual sources were, nevertheless, observed for the mixed-source consumer group, which suggests that isotope assimilation of the individual food sources may have been influenced by other underlying physiological processes. This study provides evidence that stable isotope values from different diet sources exhibit large variations as they become incorporated into consumer tissues. This suggests that the application of isotope mixing models requires consideration of several aspects such as diet type and the associated biological processes that may influence DTDFs.
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影响因子：
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作者：
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通讯作者：
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DOI：
10.1139/cjfas-2015-0531
发表时间：
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影响因子：
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