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Short-term Effect of Temperature on the Photokinetics of Microalgae from the Surface Layers of Antarctic Pack Ice
journal contributionposted on 2023-05-16, 17:30 authored by Ralph, PJ, Andrew McMinnAndrew McMinn, Ryan, KG, Ashworth, CM
Microalgae growing within brine channels (85 psu salinity) of the surface ice layers of Antarctic pack ice showed considerable photosynthetic tolerance to the extreme environmental condition. Brine microalgae exposed to temperatures above -5Â°C and at irradiances up to 350 Î¼mol photonsÂ· m -2Â·s-1 showed no photosynthetic damage or limitations. Photosynthesis was limited (but not photoinhibited) when brine microalgae were exposed to -10Â°C, provided the irradiance remained under 50 Î¼mol photonsÂ·m-2Â·s-1. The highest level of photosynthetic activity (maximum relative electron transport rate [rETR max]) in brine microalgae growing within the surface layer of sea ice was at approximately 18 Î¼mol electronsÂ·m-2Â·s -1, which occurred at -1.8Â° C. Effective quantum yield of PSII and rETRmax of the halotolerant brine microalgae exhibited a temperature-dependent pattern, where both parameters were higher at -1.8Â° C and lower at -10Â° C. Relative ETRmax at temperatures above -5Â°C were stable across a wide range of irradiance. Â© 2005 Phycological Society of America.
Australian Research Council
Publication titleJournal of Phycology
Department/SchoolInstitute for Marine and Antarctic Studies
Place of publicationOxford, England