title: The acclimation process of phytoplankton biomass, carbon fixation and respiration to the combined effects of elevated temperature and pCO2in the northern South China Sea.
abstract: We conducted shipboard microcosm experiments at both off-shore (SEATS) and near-shore (D001) stations in the northern South China Sea (NSCS) under three treatments, low temperature and low pCO2(LTLC), high temperature and low pCO2(HTLC), and high temperature and high pCO2(HTHC). Biomass of phytoplankton at both stations were enhanced by HT. HTHC did not affect phytoplankton biomass at station D001 but decreased it at station SEATS. HT alone increased net primary productivity by 234% at station SEATS and by 67% at station D001 but the stimulating effect disappeared when HC was combined. HT also increased respiration rate by 236% at station SEATS and by 87% at station D001 whereas HTHC reduced it by 61% at station SEATS and did not affect it at station D001. Overall, our findings indicate that the positive effect of ocean warming on phytoplankton assemblages in NSCS could be damped or offset by ocean acidification.
authors.affiliation: State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China; Marine Resources Development Institute of Jiangsu, Huaihai Institute of Technology, Lianyungang 222005, China.
authors.forename: Guang
authors.initials: G
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Jin
authors.affiliation: State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China.
authors.forename: Nana
authors.initials: N
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China.
authors.forename: Futian
authors.initials: F
authors.lastname: Li
authors.affiliation: State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China.
authors.forename: Shanying
authors.initials: S
authors.lastname: Tong
authors.affiliation: Marine Environmental Biology, Department of Biological Sciences, University of Southern California, 3616 Trousdale Parkway, Los Angeles, CA 90089, USA.
authors.forename: David A
authors.initials: DA
authors.lastname: Hutchins
authors.affiliation: State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China. Electronic address: ksgao@xmu.edu.cn.
authors.forename: Kunshan
authors.initials: K
authors.lastname: Gao
mesh_terms: D000064:Acclimatization; D018533:Biomass; D057486:Carbon Cycle; D002245:Carbon Dioxide / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring; D010839:Phytoplankton; D012623:Seawater; D013696:Temperature
chemical_list: D002245:Carbon Dioxide
keywords: Ocean acidification; Ocean warming; Photosynthesis; Primary productivity; Respiration; South China Sea