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JOURNAL OF PLANKTON RESEARCH | VOLUME 8 | NUMBER 5 | PAGES 891-906 | 1986
© Oxford University Press

research-article

Photoadaptation in Phaeocystis pouchetii advected beneath annual sea ice in McMurdo Sound, Antarctica

Anna C. Palmisano1,4, Janice Beeler SooHoo1, Spencer L. SooHoo2, Steven T. Kottmeier3, Lin L. Craft3 and Cornelius W. Sullivan

1Allan Hancock Foundation, University of Southern California Los Angeles, CA 90089-0371 2Scientific Data Center, Cedars Sinai Medical Center Beverly Hills, CA 90048 3Department of Biological Sciences, University of Southern California Los Angeles, CA 90089-0371, USA 4Present address: NASA-Ames Research Center Mail Stop 239-4, Moffett Field, CA 94035, USA

Received on August 1, 1985; accepted on April 1, 1986 A bloom of the colonial microalga Phaeocystis pouchetii was advected from ice-free waters to beneath 1.5 m of annual fast ice in East McMurdo Sound, Antarctica in late December 1984. Strategies of photoadaptation to a reduction in growth irradiance involved a 3- to 4-fold increase in photosynthetic efficiency per chlorophyll a ({alpha}b) and a 2- to 3-fold increase in photosynthetic efficiency per cell ({alpha}c). The index of photoadaptation (Ik) decreased by 50% on both a chlorophyll a and cellular basis. In situ production by Phaeocystis under sea ice in the East Sound is estimated to contribute 16 g carbon m–2 annually, a value comparable with sea ice algal production.


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