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The use of oxygen microelectrodes to determine the net production by an Antarctic sea ice algal community
journal contributionposted on 2023-05-16, 11:22 authored by Andrew McMinnAndrew McMinn, Ashworth, CM
Oxygen microelectrodes were used to measure the photosynthetic rates of Antarctic fast ice algal mats. Using the oxygen flux across the diffusive boundary layer below the fast ice at Davis, a productivity range of 0-1.78 mg C m-2 h-1 was measured. This is at the lower end of fast ice productivity estimates and suggests that conventional 14C techniques may overestimate sea ice algal mat productivity. Photosynthetic capacity (Pa(max)) approached 0.05 mg C. (mg chl a)-1 h-1. Onset of photosynthesis saturation, E(k), was found at c. 14 Î¼mol photons m-2 s-1. The irradiance of photoinhibition onset, E(inh), was c: 20 Î¼mol photons m-2 and the irradiance at the compensation point, E(c), was 4 Î¼mol photons m-2 s-1.
Publication titleAntarctic Science
Department/SchoolInstitute for Marine and Antarctic Studies
Place of publicationUK
Socio-economic ObjectivesManagement of Antarctic and Southern Ocean environments not elsewhere classified