Effect of elevated <i>p</i>CO<sub>2</sub> on trace gas production during an ocean acidification mesocosm experiment
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Published:2018-11-09
Issue:21
Volume:15
Page:6649-6658
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Zhang Sheng-Hui, Yu Juan, Ding Qiong-Yao, Yang Gui-Peng, Gao Kun-ShanORCID, Zhang Hong-Hai, Pan Da-Wei
Abstract
Abstract. A mesocosm experiment was conducted in Wuyuan Bay (Xiamen), China, to
investigate the effects of elevated pCO2 on the phytoplankton
species Phaeodactylum tricornutum (P. tricornutum),
Thalassiosira weissflogii (T. weissflogii) and
Emiliania huxleyi (E. huxleyi) and their production ability
of dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP), as well as four
halocarbon compounds, bromodichloromethane (CHBrCl2), methyl bromide
(CH3Br), dibromomethane (CH2Br2) and iodomethane
(CH3I). Over a period of 5 weeks, P. tricornuntum
outcompeted T. weissflogii and E. huxleyi, comprising more
than 99 % of the final biomass. During the logarithmic growth phase
(phase I), mean DMS concentration in high pCO2 mesocosms
(1000 µatm) was 28 % lower than that in low pCO2
mesocosms (400 µatm). Elevated pCO2 led to a delay in
DMSP-consuming bacteria concentrations attached to T. weissflogii
and P. tricornutum and finally resulted in the delay of DMS
concentration in the high pCO2 treatment. Unlike DMS, the elevated
pCO2 did not affect DMSP production ability of T. weissflogii or P. tricornuntum throughout the 5-week culture. A
positive relationship was detected between CH3I and T. weissflogii and P. tricornuntum during the experiment, and there
was a 40 % reduction in mean CH3I concentration in the high
pCO2 mesocosms. CHBrCl2, CH3Br, and
CH2Br2 concentrations did not increase with elevated chlorophyll
a (Chl a) concentrations compared with DMS(P) and CH3I, and
there were no major peaks both in the high pCO2 or low
pCO2 mesocosms. In addition, no effect of elevated pCO2
was identified for any of the three bromocarbons.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
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