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https://doi.org/10.5194/bg-2020-303
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-303
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  24 Aug 2020

24 Aug 2020

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This preprint is currently under review for the journal BG.

Physiological responses of Skeletonema costatum to the interactions of seawater acidification and combination of photoperiod and temperature

Hangxiao Li1,2, Tianpeng Xu1,2, Jing Ma1,2, Futian Li1,2,3, and Juntian Xu1,2,4 Hangxiao Li et al.
  • 1Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang 222005, China
  • 2Jiangsu Key Laboratory of Marine Bioresources and Environment, Jiangsu Ocean University, Lianyungang 222005, China
  • 3Jiangsu Institute of Marine Resources, Lianyungang 222005, China
  • 4Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Jiangsu Ocean University, Lianyungang 222005, China

Abstract. Ocean acidification (OA), which is a major environmental change caused by increasing atmospheric CO2, has considerable influences on marine phytoplankton. But few studies have investigated interactions of OA and seasonal changes in temperature and photoperiod on marine diatoms. In the present study, a marine diatom Skeletonema costatum was cultured under two different CO2 levels (LC, 400 μatm; HC, 1000 μatm) and three different combinations of temperature and photoperiod length (8:16 L:D with 5 ℃, 12:12 L:D with 15 ℃, 16:8 L:D with 25 ℃), simulating different seasons in typical temperate oceans, to investigate the combined effects of these factors. The results showed that specific growth rate of S. costatum increased with increasing temperature and daylength. However, OA showed contrasting effects on growth and photosynthesis under different combinations of temperature and daylength: while positive effects of OA were observed under spring and autumn conditions, it significantly decreased growth (11 %) and photosynthesis (21 %) in winter. In addition, low temperature and short daylength decreased the proteins of PSII (D1, CP47 and RubcL) at ambient pCO2 level, while OA alleviated the negative effect. These data indicated that future ocean acidification may show differential effects on diatoms in different cluster of other factors.

Hangxiao Li et al.

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Short summary
Few studies investigated interactions of ocean acidification and seasonal changes in temperature and daylength on marine diatoms. We cultured a marine diatom under two CO2 levels and three combinations of temperature and daylength, simulating different seasons, to investigate combined effects of these factors. Results showed acidification had contrasting effects under different combinations, indicating that future ocean may show differential effects on diatoms in different cluster of factors.
Few studies investigated interactions of ocean acidification and seasonal changes in temperature...
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