Physiological responses of a Southern Ocean diatom to complex future ocean conditions
Physiological responses of a Southern Ocean diatom to complex future ocean conditions
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DOI：
10.1038/nclimate2811
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发表时间：
2016-02-01
影响因子：
30.7
通讯作者：
Nunn, B. L.
中科院分区：
文献类型：
--
作者：
Boyd, P. W.;Dillingham, P. W.;Nunn, B. L.
气候变化正在改变许多海洋特性，从而改变海洋生产力。以前的浮游植物操纵研究集中在个人或这些属性的子集。在这里，我们调查多方面的变化对亚南极硅藻Pseudonitzschia multiseries的累积效应，同时操纵五个压力源（光/营养/CO2/温度/铁），主要控制其生理，并探讨改变生理性能的根本原因。气候变化促进硅藻的生长主要是由于变暖和铁的富集，这两种特性都会减少细胞营养配额，部分抵消2100年营养供应减少的影响。生理诊断和比较蛋白质组学证明了温度和铁的个体和交互作用的联合重要性，并揭示了当只考虑多压力源的子集时，从实验结果中得出的有偏见的未来预测。我们对亚南极沃茨的研究结果说明了如何需要复合区域研究来提供对未来生产力变化的准确全球预测，并区分潜在的物种特异性生理机制。
A changing climate is altering many ocean properties that consequently will modify marine productivity. Previous phytoplankton manipulation studies have focused on individual or subsets of these properties. Here, we investigate the cumulative effects of multi-faceted change on a subantarctic diatom Pseudonitzschia multiseries by concurrently manipulating five stressors (light/nutrients/CO2/temperature/iron) that primarily control its physiology, and explore underlying reasons for altered physiological performance. Climate change enhances diatom growth mainly owing to warming and iron enrichment, and both properties decrease cellular nutrient quotas, partially offsetting any effects of decreased nutrient supply by 2100. Physiological diagnostics and comparative proteomics demonstrate the joint importance of individual and interactive effects of temperature and iron, and reveal biased future predictions from experimental outcomes when only a subset of multi-stressors is considered. Our findings for subantarctic waters illustrate how composite regional studies are needed to provide accurate global projections of future shifts in productivity and distinguish underlying species-specific physiological mechanisms.