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Effects of temperature on carbon circulation in macroalgal food webs are mediated by herbivores

机译:草食动物介导温度对大型藻类食物网中碳循环的影响

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摘要

Warming is one of the most dramatic aspects of climate change and threatens future ecosystem functioning. It may alter primary productivity and thus jeopardize carbon sequestration, a crucial ecosystem service provided by coastal environments. Fucus vesiculosus is an important canopy-forming macroalga in the Baltic Sea, and its main consumer is Idotea balthica. The objective of this study is to understand how temperature impacts a simplified food web composed of macroalgae and herbivores to quantify the effect on organic carbon storage. The organisms were exposed to a temperature gradient from 5 to 25 degrees C. We measured and modeled primary production, respiration, growth and epiphytic load on the surface of Fucus and respiration, growth and egestion of Idotea. The results show that temperature affects physiological responses of Fucus and Idotea separately. However, Idotea proved more sensitive to increasing temperatures than the primary producers. The lag between the collapse of the grazer and the decline of Fucus and epiphytes above 20 degrees C allows an increase of carbon storage of the primary productivity at higher temperatures. Therefore, along the temperature gradient, the simplified food web stores carbon in a non-monotonic way (reaching minimum at 20 degrees C). Our work stresses the need of considering the combined metabolic performance of all organisms for sound predictions on carbon circulation in food webs.
机译:变暖是气候变化最剧烈的方面之一,并威胁到未来的生态系统功能。它可能会改变初级生产力,从而危及固碳,这是沿海环境提供的至关重要的生态系统服务。褐藻(Fusus vesiculosus)是波罗的海重要的形成冠层的大型藻类,其主要消费者是伊多提亚Balthica。这项研究的目的是了解温度如何影响由大型藻类和草食动物组成的简化食物网,以量化对有机碳储存的影响。生物体暴露于5至25摄氏度的温度梯度下。我们测量并建模了岩藻表面的初级生产,呼吸,生长和附生负荷以及Idotea的呼吸,生长和放养。结果表明,温度分别影响岩藻和Idotea的生理反应。但是,事实证明,Idotea对温度升高的敏感性比初级生产者高。放牧机的倒塌与Fucus和附生植物在20摄氏度以上下降之间的时间滞后,可以提高较高温度下初级生产力的碳存储量。因此,沿着温度梯度,简化的食物网以非单调方式存储碳(在20摄氏度时达到最小值)。我们的工作强调需要考虑所有生物的综合代谢性能,以便对食物网中的碳循环进行合理的预测。

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