Elemental stoichiometry for Emiliania huxleyi across a range of 12 temperatures from 8.5-28.6C

<p>This dataset includes elemental stoichiometry for Emiliania huxleyi across a range of 12 temperatures from 8.5-28.6C. Global warming will be combined with predicted increases in thermal variability in the future surface ocean, but how temperature dynamics will affect phytoplankton biology and biogeochemistry is largely unknown. Here, we examine the responses of the globally important marine coccolithophore Emiliania huxleyi to thermal variations at two frequencies (1 d and 2 d) at low (18.5 °C) and high (25.5 °C) mean temperatures. Elevated temperature and thermal variation decreased growth, calcification and physiological rates, both individually and interactively. The 1 d thermal variation frequencies were less inhibitory than 2 d variations under high temperatures, indicating that high-frequency thermal fluctuations may reduce heat-induced mortality and mitigate some impacts of extreme high-temperature events. Cellular elemental composition and calcification was significantly affected by both thermal variation treatments relative to each other and to the constant temperature controls. The negative effects of thermal variation on E. huxleyi growth rate and physiology are especially pronounced at high temperatures. These responses of the key marine calcifier E. huxleyi to warmer, more variable temperature regimes have potentially large implications for ocean productivity and marine biogeochemical cycles under a future changing climate.</p>

<p>These data are published in Wang, X., Fu, F., Qu, P., Kling, J. D., Jiang, H., Gao, Y., &amp; Hutchins, D. A. (2019). How will the key marine calcifier Emiliania huxleyi respond to a warmer and more thermally variable ocean?. Biogeosciences, 16(22), 4393-4409. doi:10.5194/bg-2019-179.</p>

本数据集涵盖赫氏颗石藻（Emiliania huxleyi）在8.5~28.6℃区间内12个温度梯度下的元素化学计量学（elemental stoichiometry）数据。未来表层海洋中，全球变暖将伴随预测的热变率升高，但温度动态如何影响浮游植物的生物学过程与生物地球化学循环，目前仍不明确。本研究以全球分布广泛的海洋钙化颗石藻（coccolithophore）赫氏颗石藻为研究对象，在低（18.5℃）与高（25.5℃）平均温度条件下，探究其对两种频率（1天、2天）热波动的响应。结果表明，升温与热波动无论是单独作用还是交互作用，均会抑制藻类的生长、钙化及生理速率；在高温环境下，1天周期的热波动抑制效应弱于2天周期，提示高频热波动或可降低热诱导的死亡率，缓解极端高温事件带来的部分负面影响。相较于恒温对照组，两种热波动处理均显著改变了细胞的元素组成与钙化水平，且两种热波动处理组之间的差异同样显著。热波动对赫氏颗石藻生长速率与生理机能的负面影响在高温条件下尤为显著。该关键海洋钙化生物对更暖、热变率更高的温度环境的响应，对未来气候变化背景下的海洋生产力与海洋生物地球化学循环具有潜在的重大影响。

本数据集已发表于Wang, X.、Fu, F.、Qu, P.、Kling, J. D.、Jiang, H.、Gao, Y. 及Hutchins, D. A. 2019年的研究论文《How will the key marine calcifier Emiliania huxleyi respond to a warmer and more thermally variable ocean?》，刊载于《Biogeosciences》第16卷第22期，页码范围为4393-4409，DOI：10.5194/bg-2019-179。