Phenotypic plasticity of carbon fixation stimulates cyanobacterial blooms at elevated CO2
Phenotypic plasticity of carbon fixation stimulates cyanobacterial blooms at elevated CO2
复制标题
碳固定的表型可塑性在二氧化碳浓度升高时刺激蓝藻大量繁殖
DOI：
10.1126/sciadv.aax2926
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发表时间：
2020-02-01
期刊：
影响因子：
13.6
通讯作者：
Huisman, Jef
中科院分区：
文献类型：
--
作者：
Ji, Xing;Verspagen, Jolanda M. H.;Huisman, Jef
对高二氧化碳的生理适应将加剧湖泊中的蓝藻水华。虽然表型可塑性是一种广泛的现象，但它对物种对气候变化的反应的影响还没有被很好地理解。例如，有毒蓝藻可以在许多富营养化的湖泊中形成密集的表面水华，威胁水质，但在二氧化碳浓度升高时，预测表型可塑性如何影响水华发育的理论框架仍然缺乏。我们测量了常见的水华蓝藻微囊藻的固碳率的表型可塑性。我们的结果显示，在二氧化碳浓度升高的情况下，微囊藻的最大二氧化碳吸收速率增加了1.8到5倍，超过了其他浮游植物对二氧化碳的响应。观察到的可塑性被合并到一个数学模型中，以预测蓝藻丰度的动态变化。该模型得到了实验室实验的成功验证，并预测适应高二氧化碳会加剧富营养化湖泊中的微囊藻水华。这些结果表明，这种有害的蓝藻很可能从大气二氧化碳浓度上升中受益匪浅。
Physiological acclimation to elevated CO2 will intensify cyanobacterial blooms in lakes. Although phenotypic plasticity is a widespread phenomenon, its implications for species responses to climate change are not well understood. For example, toxic cyanobacteria can form dense surface blooms threatening water quality in many eutrophic lakes, yet a theoretical framework to predict how phenotypic plasticity affects bloom development at elevated pCO2 is still lacking. We measured phenotypic plasticity of the carbon fixation rates of the common bloom-forming cyanobacterium Microcystis. Our results revealed a 1.8- to 5-fold increase in the maximum CO2 uptake rate of Microcystis at elevated pCO2, which exceeds CO2 responses reported for other phytoplankton species. The observed plasticity was incorporated into a mathematical model to predict dynamic changes in cyanobacterial abundance. The model was successfully validated by laboratory experiments and predicts that acclimation to high pCO2 will intensify Microcystis blooms in eutrophic lakes. These results indicate that this harmful cyanobacterium is likely to benefit strongly from rising atmospheric pCO2.