Short-term effect of temperature on the photokinetics of microalgae from the surface layers of Antarctic pack ice
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 show...
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ftunivtsydney:oai:opus.lib.uts.edu.au:10453/3795 2023-05-15T14:06:27+02:00 Short-term effect of temperature on the photokinetics of microalgae from the surface layers of Antarctic pack ice Ralph, PJ McMinn, A Ryan, KG Ashworth, C 2005-08-01 application/pdf http://hdl.handle.net/10453/3795 unknown Journal of Phycology 10.1111/j.1529-8817.2005.00106.x Journal of Phycology, 2005, 41 (4), pp. 763 - 769 0022-3646 http://hdl.handle.net/10453/3795 Marine Biology & Hydrobiology Journal Article 2005 ftunivtsydney 2022-03-13T13:46:11Z 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. Article in Journal/Newspaper Antarc* Antarctic Sea ice University of Technology Sydney: OPUS - Open Publications of UTS Scholars Antarctic |
institution |
Open Polar |
collection |
University of Technology Sydney: OPUS - Open Publications of UTS Scholars |
op_collection_id |
ftunivtsydney |
language |
unknown |
topic |
Marine Biology & Hydrobiology |
spellingShingle |
Marine Biology & Hydrobiology Ralph, PJ McMinn, A Ryan, KG Ashworth, C Short-term effect of temperature on the photokinetics of microalgae from the surface layers of Antarctic pack ice |
topic_facet |
Marine Biology & Hydrobiology |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Ralph, PJ McMinn, A Ryan, KG Ashworth, C |
author_facet |
Ralph, PJ McMinn, A Ryan, KG Ashworth, C |
author_sort |
Ralph, PJ |
title |
Short-term effect of temperature on the photokinetics of microalgae from the surface layers of Antarctic pack ice |
title_short |
Short-term effect of temperature on the photokinetics of microalgae from the surface layers of Antarctic pack ice |
title_full |
Short-term effect of temperature on the photokinetics of microalgae from the surface layers of Antarctic pack ice |
title_fullStr |
Short-term effect of temperature on the photokinetics of microalgae from the surface layers of Antarctic pack ice |
title_full_unstemmed |
Short-term effect of temperature on the photokinetics of microalgae from the surface layers of Antarctic pack ice |
title_sort |
short-term effect of temperature on the photokinetics of microalgae from the surface layers of antarctic pack ice |
publishDate |
2005 |
url |
http://hdl.handle.net/10453/3795 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
Journal of Phycology 10.1111/j.1529-8817.2005.00106.x Journal of Phycology, 2005, 41 (4), pp. 763 - 769 0022-3646 http://hdl.handle.net/10453/3795 |
_version_ |
1766278167221239808 |