U‐shaped response Unifies views on temperature dependency of stoichiometric requirements,Ecology Letters

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U‐shaped response Unifies views on temperature dependency of stoichiometric requirements
Ecology Letters ( IF 7.6 ) Pub Date : 2020-03-24 , DOI: 10.1111/ele.13493
Thomas Ruiz ₁ , Apostolos‐Manuel Koussoroplis ₁ , Michael Danger ₂ , Jean‐Pierre Aguer ₁ , Nicole Morel‐Desrosiers ₁ , Alexandre Bec ₁

Affiliation

Temperature and nutrient availability, which are major drivers of consumer performance, are dramatically affected by global change. To date, there is no consensus on whether warming increases or decreases consumer needs for dietary carbon (C) relatively to phosphorus (P), thus hindering predictions of secondary production responses to global change. Here, we investigate how the dietary C:P ratio optimising consumer growth (TER_C:P: Threshold Elemental Ratio) changes along temperature gradients by combining a temperature‐dependent TER_C:P model with growth experiments on Daphnia magna. Both lines of evidence show that the TER_C:P response to temperature is U‐shaped. This shape indicates that consumer nutrient requirements can both increase or decrease with increasing temperature, thus reconciling previous contradictive observations into a common framework. This unified framework improves our capacity to forecast the combined effects of nutrient cycle and climatic alterations on invertebrate production.

中文翻译：

U形响应统一了对化学计量要求的温度依赖性的看法

温度和养分供应量是消费者表现的主要驱动力，受到全球变化的极大影响。迄今为止，关于变暖是相对于磷（P）而言，是增加还是减少了消费者对膳食碳（C）的需求尚无共识，从而阻碍了对次生生产对全球变化的反应的预测。在这里，我们通过结合温度依赖的TER _C：P模型与大型蚤的生长实验，研究了优化消费者增长的饮食C：P比（TER _C：P：阈值元素比）如何沿着温度梯度变化。两条证据都表明，TER _C：P温度响应呈U形。这种形状表明，消费者对营养的需求量可以随温度的升高而增加或减少，因此可以将以前的矛盾观察结果统一为一个共同的框架。这个统一的框架提高了我们预测养分循环和气候变化对无脊椎动物生产的综合影响的能力。

更新日期：2020-04-22

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