ZHANG Dajuan, GUO Donghui, WANG Guizhong, LI Shaojing. Response of antioxidant defense system in copepod Calanus sinicus Brodsky exposed to CO2-acidified seawater[J]. Acta Oceanologica Sinica, 2016, 35(8): 82-88. doi: 10.1007/s13131-016-0870-5
Citation: ZHANG Dajuan, GUO Donghui, WANG Guizhong, LI Shaojing. Response of antioxidant defense system in copepod Calanus sinicus Brodsky exposed to CO2-acidified seawater[J]. Acta Oceanologica Sinica, 2016, 35(8): 82-88. doi: 10.1007/s13131-016-0870-5

Response of antioxidant defense system in copepod Calanus sinicus Brodsky exposed to CO2-acidified seawater

doi: 10.1007/s13131-016-0870-5
  • Received Date: 2014-10-20
  • Rev Recd Date: 2015-09-11
  • Marine zooplankton responds sensitively to elevated seawater CO2 concentration. However, the underlying physiological mechanisms have not been studied well. We therefore investigated the effects of elevated CO2 concentration (0.08%, 0.20%, 0.50% and 1.00%) on antioxidant defense components, as well as two detoxification enzymes of Calanus sinicus (copepod). The results showed that glutathione peroxidase (GPx) activity exposed to CO2-acidified seawater was significantly stimulated while other antioxidant components, including glutathione-Stransferase (GST) activity, superoxide dismutase (SOD) activity decreased significantly with reduced glutathione (GSH) level and GSH/oxidized glutathione (GSSG) value. CO2-acidified seawater exhibited stimulatory effects on adenosine triphosphatase (ATPase) activity and acetylcholinesterase (AchE) activity was inhibited. Moreover, the results of principal component analysis indicated that 75.93% of the overall variance was explained by the first two principal components. The elevated CO2 concentration may affect the metabolism and survivals of copepods through impacts these enzymes activities. Further studies are needed to focus on the synergistic effects of elevated CO2 concentration and other environmental factors on copepods.
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