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The use of oxygen microelectrodes to determine the net production by an Antarctic sea ice algal community
journal contribution
posted on 2023-05-16, 11:22 authored by Andrew McMinnAndrew McMinn, Ashworth, CMOxygen 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 μmol photons m-2 s-1. The irradiance of photoinhibition onset, E(inh), was c: 20 μmol photons m-2 and the irradiance at the compensation point, E(c), was 4 μmol photons m-2 s-1.
History
Publication title
Antarctic ScienceVolume
10Pagination
39-44ISSN
0954-1020Department/School
Institute for Marine and Antarctic StudiesPublisher
Blackwell SciencePlace of publication
UKRepository Status
- Restricted