Biology Department, Montana State University, Bozeman, Montana 59717.
RATES OF PHOTOADAPTATION IN SEA ICE DIATOMS FROM MCMURDO SOUND, ANTARCTICA1
Version of Record online: 27 OCT 2004
Journal of Phycology
Volume 27, Issue 3, pages 367–373, June 1991
How to Cite
Lizotte, M. P. and Sullivan, C. W. (1991), RATES OF PHOTOADAPTATION IN SEA ICE DIATOMS FROM MCMURDO SOUND, ANTARCTICA. Journal of Phycology, 27: 367–373. doi: 10.1111/j.0022-3646.1991.00367.x
Received 5 November 1990. Accepted 20 February 1991.
We thank A. C. Palmisano, G. A. Smith, and J. C. Priscu for their assistance in the field, and A. C. Palmisano and D. H. Robinson for comments on this manuscript. This work was supported by NSF grant DPP-8415215 to A. C. Palmisano and C. W. Sullivan.
- Issue online: 27 OCT 2004
- Version of Record online: 27 OCT 2004
- diatom physiology;
- ice algae;
- sea ice
Sea ice microalgae are released from their relatively stable light environment to the water column seasonally, and any subsequent growth in a vertically mixed water column may depend, in part, on their photoadaptation rates. In this study we followed the time course of photoadaptation in natural sea ice algal communities from bottom ice and surface ice by measuring their photophysiological response to an artificial shift in the ambient irradiance field. Microalgae from under-ice habitats, were incubated under full sunlight (LL-HL) and microalgae from surface ice habitats were incubated under artificial light to mimic under-ice irradiance (HL-LL). During 3- to 4-day time course studies, opposite shifts in chlorophyll: carbon, α, PBm, and Ik were observed, depending on the direction of the irradiance change. First-order rate constants (k) ranged from 0.0067 to 0.29 h−1 for photosynthetic parameters, although PBm did not always show a clear change over time. Rates of photoadaptation for ice algae are comparable to k values reported for temperate phytoplankton, suggesting that sea ice algae may be equally capable of adapting to the light conditions experienced in a vertically mixed water column. This study presents the first evidence that sea ice microalgae are physiologically capable of adapting to a planktonic life and thus could serve as a seed population for polar marine phytoplankton blooms.