Department of Biological Sciences, University of Québec at Montréal, C.P. 8888 Succ. Centre-Ville, Montréal, QC, H3C 3P8, Canada.
Ecol Lett. 2017 Nov;20(11):1395-1404. doi: 10.1111/ele.12835.
Recent experimental evidence suggests that changes in the partial pressure of CO (pCO ), in concert with nutrient fertilisation, may result in increased primary production and shifted phytoplankton community composition that favours species lacking adaptations to low CO environments. It is not clear whether these results apply in ambient freshwaters, which are already often supersaturated in CO , and where phytoplankton structure and activity are under complex control of diverse local and regional factors. Here, we use a large-scale comparative study of 69 boreal lakes to explore the influence of existing CO gradients (c. 50-2300 μatm) on phytoplankton community composition and biomass production. While community composition did not respond to pCO gradients, gross primary production was enhanced, but only in lakes already supersaturated in CO , demonstrating that environmental context is key in determining pCO -phytoplankton interactions. We further argue that increased atmospheric CO is unlikely to influence phytoplanktonic composition and production in northern lakes.
最近的实验证据表明，CO2 分压（pCO2）的变化与营养施肥相结合，可能导致初级生产力增加和浮游植物群落组成的改变，有利于那些缺乏适应低 CO2 环境的物种。目前还不清楚这些结果是否适用于已经 CO2 过饱和的环境淡水，而这些淡水的浮游植物结构和活动受到各种本地和区域因素的复杂控制。在这里，我们使用 69 个北方湖泊的大规模比较研究来探索现有 CO2 梯度（约 50-2300 μatm）对浮游植物群落组成和生物量生产的影响。虽然群落组成没有对 pCO2 梯度做出响应，但总初级生产力确实有所提高，但仅在 CO2 已经过饱和的湖泊中，这表明环境背景是决定 pCO2-浮游植物相互作用的关键。我们进一步认为，大气中 CO2 的增加不太可能影响北方湖泊的浮游植物组成和生产力。
