1. Effect of elevated pCO2 on trace gas production during an ocean acidification mesocosm experiment.
- Author
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Sheng-Hui Zhang, Qiong-Yao Ding, Gui-Peng Yang, Kun-Shan Gao, Hong-Hai Zhang, and Da-Wei Pan
- Subjects
CARBON dioxide & the environment ,OCEAN acidification ,TRACE gases ,PHYTOPLANKTON ,DIMETHYLPROPIOTHETIN - Abstract
A mesocosm experiment was conducted in Wuyuan Bay (Xiamen), China to investigate the effects of elevated pCO
2 on phytoplankton species and production of dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) as well as four halocarbon compounds (CHBrCl2 , CH3 Br, CH2 Br2 , and CH3 I). Over a period of 5 weeks, P. tricornutum outcompeted T. weissflogii and E. huxleyi, comprising more than 99 % of the final biomass. During the logarithmic growth phase (phase I), DMS concentrations in high pCO2 mesocosms (1000 µatm) were 28.2 % lower than those in low pCO2 mesocosms (400 µatm). Elevated pCO2 led to a delay in DMSP-consuming bacteria attached to T. weissflogii and P. tricornutum and finally resulted in the delay of DMS concentration in the HC treatment. Unlike DMS, the elevated pCO2 did not affect DMSP production ability of T. weissflogii or P. tricornutum throughout the 5 week culture. A positive relationship was detected between CH3 I and T. weissflogii and P. tricornutum during the experiment, and there was a 40.2 % reduction in mean CH3 I concentrations in the HC mesocosms. CHBrCl2 , CH3 Br, and CH2 Br2 concentrations did not increase with elevated chlorophyll a (Chl a) concentrations compared with DMS(P) and CH3 I, and there were no major peak in the HC or LC mesocosms. In addition, no effect of elevated pCO2 was identified for any of the three bromocarbons. [ABSTRACT FROM AUTHOR]- Published
- 2018
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