title: Effect of excessive CO2 on physiological functions in coastal diatom.
abstract: Rising dissolution of anthropogenic CO2 in seawater may directly/indirectly cause ocean acidification and desalination. However, little is known about coastal physiological functions sensitivity to these processes. Here we show some links between ocean acidification/desalination and physiological functions in Thalassiosira weissflogii. Cell density (CD), protein, chlorophyll a (Chl a), malonaldehyde (MDA), superoxide dismutase (SOD), and carbonic anhydrase (CAs) were determined for the assessment of algal biomass, nutritional value, photosynthesis and respiration, lipid peroxidation, antioxidant capacity, and carbon sequestration ability. The influence of pH on the algal Chl a and MDA were extremely significant (P < 0.01). Salinity (S) on cell density and acidity (pH) on protein was significant (0.01 < P < 0.05). Additionally, a significant negative-correlation was observed between cell density and CAs. CAs and SOD had negatively correlations with CD, Chl a, protein, and MDA under pH or S influence, but positive correlation between themselves. Coastal physiological functions were affected by increasing order was acidification < acidification + desalination < desalination for Chl a and protein, desalination < acidification + desalination < acidification for SOD and CAs. Thus, the ongoing excessive CO2-driven ocean acidification and desalination should be of high attention when assessing the risks of climate change on coastal phytoplankton.
authors.affiliation: Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, China, 363000.|College of the Environment &Ecology, Xiamen University, 361005, China.
authors.forename: Feng-Jiao
authors.initials: FJ
authors.lastname: Liu
authors.affiliation: Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, China, 363000.
authors.forename: Shun-Xing
authors.initials: SX
authors.lastname: Li
authors.affiliation: College of the Environment &Ecology, Xiamen University, 361005, China.
authors.forename: Bang-Qin
authors.initials: BQ
authors.lastname: Huang
authors.affiliation: Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, China, 363000.
authors.forename: Feng-Ying
authors.initials: FY
authors.lastname: Zheng
authors.affiliation: Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, China, 363000.
authors.forename: Xu-Guang
authors.initials: XG
authors.lastname: Huang
mesh_terms: D018533:Biomass; D002245:Carbon Dioxide / Q000378:metabolism*; D017377:Diatoms / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D004781:Environmental Exposure; D006863:Hydrogen-Ion Concentration; D055442:Metabolome / Q000187:drug effects
chemical_list: D002245:Carbon Dioxide