Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Discussion papers
https://doi.org/10.5194/bg-2019-179
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2019-179
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 27 May 2019

Submitted as: research article | 27 May 2019

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Biogeosciences (BG).

How will the key marine calcifier Emiliania huxleyi respond to a warmer and more thermally variable ocean?

Xinwei Wang1, Feixue Fu2, Pingping Qu2, Joshua D. Kling2, Haibo Jiang3, Yahui Gao1,4, and David A. Hutchins2 Xinwei Wang et al.
  • 1School of Life Sciences, Xiamen University, Xiamen, 361005, China
  • 2Department of Biological Sciences, University of Southern California, Los Angeles, California, 90089, USA
  • 3School of Life Sciences, Central China Normal University, Wuhan, Hubei, China
  • 4Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361005, China

Abstract. 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 (one-day and two-day) 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. One-day thermal variation frequencies were less inhibitory than two-day variations under high temperature, 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.

Xinwei Wang et al.
Xinwei Wang et al.
Xinwei Wang et al.
Viewed  
Total article views: 219 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
160 58 1 219 0 0
  • HTML: 160
  • PDF: 58
  • XML: 1
  • Total: 219
  • BibTeX: 0
  • EndNote: 0
Views and downloads (calculated since 27 May 2019)
Cumulative views and downloads (calculated since 27 May 2019)
Viewed (geographical distribution)  
Total article views: 200 (including HTML, PDF, and XML) Thereof 199 with geography defined and 1 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited  
Saved  
No saved metrics found.
Discussed  
No discussed metrics found.
Latest update: 16 Sep 2019
Publications Copernicus
Download
Short summary
In this study, we examine the responses of E. huxleyi to a future warmer and more thermally variable ocean. Elevated temperature and thermal variation perform negative effects on growth rate and physiology which are especially pronounced at high temperatures, but high frequency thermal variation may reduce the risk of extreme high temperature events. These findings have potentially large implications for ocean productivity and marine biogeochemical cycles under a future changing climate.
In this study, we examine the responses of E. huxleyi to a future warmer and more thermally...
Citation