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Toward a mechanistic understanding of trophic structure: inferences from simulating stable isotope ratios

机译：对营养结构的机械理解：通过模拟稳定同位素比得出的推论

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摘要

Stable isotope ratios (SIR) are widely used to estimate food-web trophic levels (TLs). We built systems dynamic N-biomass-based models of different levels of complexity, containing explicit descriptions of isotope fractionation and of trophic level. The values of delta N-15 and TLs, as independent and emergent properties, were used to test the potential for the SIR of nutrients, primary producers, consumers, and detritus to align with food-web TLs. Our analysis shows that there is no universal relationship between TL and delta N-15 that permits a robust prognostic tool for configuration of food webs even if all system components can be reliably analysed. The predictive capability is confounded by prior dietary preference, intra-guild predation and recycling of biomass through detritus. These matters affect the dynamics of both the TLs and SIR. While SIR data alone have poor explanatory power, they would be valuable for validating the construction and functioning of dynamic models. This requires construction of coupled system dynamic models that describe bulk elemental distribution with an explicit description of isotope discriminations within and amongst functional groups and nutrient pools, as used here. Only adequately configured models would be able to explain both the bulk elemental distributions and the SIR data. Such an approach would provide a powerful test of the whole model, integrating changing abiotic and biotic events across time and space.
机译：稳定同位素比（SIR）被广泛用于估算食物网的营养水平（TLs）。我们建立了具有不同复杂程度的基于动态N生物质的系统模型，其中包含对同位素分馏和营养级的明确描述。 Delta N-15和TL的值具有独立性和突现性，用于测试养分，主要生产者，消费者和碎屑的SIR与食物网TL保持一致的潜力。我们的分析表明，即使可以可靠地分析所有系统组件，TL和Delta N-15之间也没有通用关系，因此不能使用可靠的预测工具来配置食物网。预测能力与先前的饮食习惯，行内捕食和通过碎屑回收生物质相混淆。这些问题影响TL和SIR的动态。虽然仅SIR数据具有较差的解释力，但它们对于验证动态模型的构造和功能将是有价值的。这要求构建耦合系统动力学模型，该模型描述体积元素分布，并在此明确使用功能组和养分库之间和内部的同位素歧视描述。只有适当配置的模型才能解释大量元素分布和SIR数据。这种方法将对整个模型进行强大的测试，整合跨时空变化的非生物和生物事件。

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    《Marine biology》 |2018年第9期|147.1-147.13|共13页
  • 作者

    Flynn Kevin J.; Mitra Aditee; Bode Antonio;

  • 作者单位

    Swansea Univ, Biosci, Singleton Pk, Swansea SA2 8PP, W Glam, Wales;

    Swansea Univ, Biosci, Singleton Pk, Swansea SA2 8PP, W Glam, Wales;

    Ctr Oceanog A Coruna, IEO, Apdo 130, La Coruna 15080, Spain;

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