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Short-term Effect of Temperature on the Photokinetics of Microalgae from the Surface Layers of Antarctic Pack Ice

Citation

Ralph, PJ and McMinn, A and Ryan, KG and Ashworth, CM, Short-term Effect of Temperature on the Photokinetics of Microalgae from the Surface Layers of Antarctic Pack Ice, Journal of Phycology, 41, (4) pp. 763-769. ISSN 0022-3646 (2005) [Refereed Article]

DOI: doi:10.1111/j.1529-8817.2005.00106.x

Abstract

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 -5°C and at irradiances up to 350 μmol photons· m -2·s-1 showed no photosynthetic damage or limitations. Photosynthesis was limited (but not photoinhibited) when brine microalgae were exposed to -10°C, provided the irradiance remained under 50 μmol photons·m-2·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 μmol electrons·m-2·s -1, which occurred at -1.8° C. Effective quantum yield of PSII and rETRmax of the halotolerant brine microalgae exhibited a temperature-dependent pattern, where both parameters were higher at -1.8° C and lower at -10° C. Relative ETRmax at temperatures above -5°C were stable across a wide range of irradiance. © 2005 Phycological Society of America.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Marine Environments
Author:McMinn, A (Professor Andrew McMinn)
Author:Ashworth, CM (Mr Chris Ashworth)
ID Code:38123
Year Published:2005
Funding Support:Australian Research Council (DP0344067)
Web of Science® Times Cited:41
Deposited By:IASOS
Deposited On:2005-08-01
Last Modified:2006-05-09
Downloads:0

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