Unexpected changes in community size structure in a natural warming experiment
Unexpected changes in community size structure in a natural warming experiment
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DOI：
10.1038/nclimate3368
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发表时间：
2017-08
影响因子：
30.7
通讯作者：
Eoin J. O’Gorman;Lei Zhao;Doris E. Pichler;G. Adams;N. Friberg;Björn C. Rall;A. Seeney;Huayong Zhang;D. Reuman;G. Woodward
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作者：
Eoin J. O’Gorman;Lei Zhao;Doris E. Pichler;G. Adams;N. Friberg;Björn C. Rall;A. Seeney;Huayong Zhang;D. Reuman;G. Woodward
自然生态系统通常由许多小的和很少的大型有机体、。体重和丰度之间的这种负关系的尺度对资源分配和能源使用具有重要的影响。据预测，下个世纪的全球变暖将有利于较小的生物体，……，产生更陡峭的质量-丰度比例，并通过食物链进行更低效率的生物量转移。在这里，我们展示了一个自然变暖实验中的相反效果，该实验涉及同一流域内的13个全流生态系统，跨越5-25 °C的温度梯度。我们引入了一个机制模型，该模型说明了基本资源承载能力的温度依赖如何解释这些先前未预料到的结果。如果养分供应随着温度的升高而增加，以抵消初级生产者不断上升的新陈代谢需求，就会有足够的资源来维持营养水平较高的较大消费者。这些新的数据和解释它们的模型突出了一些普遍认为的关于自然生态系统对气候变暖的反应的“规则”的重要例外。
Natural ecosystems typically consist of many small and few large organisms,,,. The scaling of this negative relationship between body mass and abundance has important implications for resource partitioning and energy usage,,. Global warming over the next century is predicted to favour smaller organisms,,,,, producing steeper mass–abundance scaling and a less efficient transfer of biomass through the food web. Here, we show that the opposite effect occurs in a natural warming experiment involving 13 whole-stream ecosystems within the same catchment, which span a temperature gradient of 5–25 °C. We introduce a mechanistic model that shows how the temperature dependence of basal resource carrying capacity can account for these previously unexpected results. If nutrient supply increases with temperature to offset the rising metabolic demand of primary producers, there will be sufficient resources to sustain larger consumers at higher trophic levels. These new data and the model that explains them highlight important exceptions to some commonly assumed ‘rules’ about responses to warming in natural ecosystems.