Zinc biogeochemical cycle in the Tasman Sea : potential role for phytoplankton communities ...

• Main Author: Sinoir, M
• Format: Thesis
• Language: unknown
• Published: University Of Tasmania 2023
• Subjects: Southern Ocean
• Online Access: https://dx.doi.org/10.25959/23205770; https://figshare.utas.edu.au/articles/thesis/Zinc_biogeochemical_cycle_in_the_Tasman_Sea_potential_role_for_phytoplankton_communities/23205770

Zinc (Zn) plays an essential role in metabolic and structural functions for marine phytoplankton, being required in nearly 300 enzymes and proteins including carbonic anhydrase and alkaline phosphatase. The concentration of total dissolved Zn in the open-ocean is typically in the nanomolar (0.1-10 nmol L\\(^{-1}\\)) range, 98 % of which is complexed by natural strong organic ligands. In January and February 2010, the Primary productivity Induced by Iron and Nitrogen in the Tasman Sea (PINTS) cruise covered a north to south transect from the oligotropic Tasman Sea to the productive waters of the subantarctic Southern Ocean. For this thesis, samples for chemical analyses and laboratory- based cultures were collected to assess the relationship between phytoplankton growth and zinc bioavailability and speciation in this region. The pennate diatom \\(Nitzschia\\) \\(closterium\\) and the coccolithophorid \\(Emiliania\\) \\(huxleyi\\) were cultured at low free Zn concentrations ([Zn\\(^{2+}\\)] = 1.5 x ...