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首页> 外文期刊>Journal of Insect Physiology >The thermal dependence of carbon stable isotope incorporation and trophic discrimination in the domestic cricket, Acheta domesticus
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The thermal dependence of carbon stable isotope incorporation and trophic discrimination in the domestic cricket, Acheta domesticus

机译：碳稳定同位素的热依赖性在国内蟋蟀，Acheta Domesticus中的蟋蟀融合和营养鉴别

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摘要

Stable isotopes are valuable tools in physiological and ecological research, as they can be used to estimate diet, habitat use, and resource allocation. However, in most cases a priori knowledge of two key properties of stable isotopes is required, namely their rate of incorporation into the body (incorporation rate) and the change of isotope values between consumers and resources that arises during incorporation of the isotopes into the consumer's tissues (trophic discrimination). Previous studies have quantified these properties across species and tissue types, but little is known about how they vary with temperature, a key driver of many biological rates and times. Here, we explored for the first time how temperature affects both carbon incorporation rate and trophic discrimination via growth rates, using the domestic cricket, Acheta domesticus. We raised crickets at 16 degrees C, 21 degrees C, and 26 degrees C and showed that temperature increased carbon isotope incorporation rate, which was driven by both an increased growth rate and catabolism at higher temperatures. Trophic discrimination of carbon isotopes decreased at higher temperatures, which we attributed to either lower activation energies needed to synthesize non-essential amino acids at higher temperatures or the increased utilization of available resources of consumers at higher temperatures. Our results demonstrate that temperature is a key driver of both carbon isotope incorporation rate and trophic discrimination, via mechanisms that likely persist across all ectotherms. Experiments to determine incorporation rates and trophic discrimination factors in ectotherms must include temperature as a major factor, and natural variation in temperature might have significant effects on these isotopic properties that then can affect inferences made from isotope values.
机译：稳定的同位素是生理生态研究中的有价值的工具，因为它们可用于估算饮食，栖息地使用和资源分配。然而，在大多数情况下，需要优先考虑稳定同位素的两个关键特性的先验知识，即它们在身体（掺入率）中的掺入率以及在将同位素纳入消费者期间出现的消费者和资源之间的同位素值的变化组织（营养歧视）。以前的研究已经量化了跨种类和组织类型的这些性质，但是关于它们如何随温度而变化的众所周知，这是许多生物速率和时间的关键驱动力。在这里，我们首次探索了温度如何通过生长率来影响碳融资率和营养性歧视，使用国内蟋蟀Acheta Domesticus。我们在16℃，21℃和26摄氏度下凸起的蟋蟀，并显示温度增加了碳同位素掺入率，其在较高温度下增加的生长速率和分解代谢的增加。在较高温度下，碳同位素的营养鉴别降低，这归因于在较高温度下合成非必需氨基酸所需的较低的活化能量或在较高温度下增加消费者的可用资源的利用率。我们的结果表明，温度是碳同位素掺入率和营养性歧视的关键驱动器，通过可能持续到所有ectoTherms的机制。确定成立率和渗出速度的渗透率和疏水性辨别因子的实验必须包括温度作为主要因素，并且温度的自然变化可能对这些同位素性质产生显着影响，然后可以影响由同位素值制备的推论。

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