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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, 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 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 Science

Volume

10

Pagination

39-44

ISSN

0954-1020

Department/School

Institute for Marine and Antarctic Studies

Publisher

Blackwell Science

Place of publication

UK

Repository Status

  • Restricted

Socio-economic Objectives

Management of Antarctic and Southern Ocean environments not elsewhere classified

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