Diurnal changes in photosynthesis of Antarctic fast ice algal communities determined by pulse amplitude modulation fluorometry
The aim of this project was to determine both the diurnal changes in photosynthetic activity of Antarctic sea ice algae and also the protective mechanisms they use to mitigate the effects of in situ UV radiation. Changes in the diurnal photosynthetic parameters of fast ice algal communities at McMur...
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Online Access: | https://doi.org/10.1007/s00227-003-1052-5 http://ecite.utas.edu.au/29148 |
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ftunivtasecite:oai:ecite.utas.edu.au:29148 2023-05-15T14:03:54+02:00 Diurnal changes in photosynthesis of Antarctic fast ice algal communities determined by pulse amplitude modulation fluorometry McMinn, A Ryan, K Gademann, R 2003 https://doi.org/10.1007/s00227-003-1052-5 http://ecite.utas.edu.au/29148 en eng Springer-Verlag http://dx.doi.org/10.1007/s00227-003-1052-5 McMinn, A and Ryan, K and Gademann, R, Diurnal changes in photosynthesis of Antarctic fast ice algal communities determined by pulse amplitude modulation fluorometry, Marine Biology, 143, (2) pp. 359-367. ISSN 0025-3162 (2003) [Refereed Article] http://ecite.utas.edu.au/29148 Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Refereed Article PeerReviewed 2003 ftunivtasecite https://doi.org/10.1007/s00227-003-1052-5 2019-12-13T21:09:21Z The aim of this project was to determine both the diurnal changes in photosynthetic activity of Antarctic sea ice algae and also the protective mechanisms they use to mitigate the effects of in situ UV radiation. Changes in the diurnal photosynthetic parameters of fast ice algal communities at McMurdo Sound were measured in situ, using a custom designed monitoring pulse amplitude modulation fluorometer. The sea ice microalgae were able to adapt rapidly to either increasing or decreasing ambient irradiances. F/Fm' values were between 0.2 and 0.51, while Ek varied between 2.1 and 18 mol photons m-2 s-1. F/Fm', E k, and relative electron transfer rate (rETR) all varied sequentially over the course of a day. rETR and Ek were highest at midday at the highest irradiances, when there was apparent midday down regulation of photosynthesis, while F/Fm' was highest at midnight. The effects of natural UV radiation on sea ice were examined, but it was not possible to detect the effect of either UVB or UVA and UVB on photosynthesis. This was considered to be largely because of the large spatial and temporal heterogeneity of the under ice community, changing irradiances throughout the day and the relatively small change caused by UV. Article in Journal/Newspaper Antarc* Antarctic ice algae McMurdo Sound Sea ice eCite UTAS (University of Tasmania) Antarctic McMurdo Sound Marine Biology 143 2 359 367 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
spellingShingle |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) McMinn, A Ryan, K Gademann, R Diurnal changes in photosynthesis of Antarctic fast ice algal communities determined by pulse amplitude modulation fluorometry |
topic_facet |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
description |
The aim of this project was to determine both the diurnal changes in photosynthetic activity of Antarctic sea ice algae and also the protective mechanisms they use to mitigate the effects of in situ UV radiation. Changes in the diurnal photosynthetic parameters of fast ice algal communities at McMurdo Sound were measured in situ, using a custom designed monitoring pulse amplitude modulation fluorometer. The sea ice microalgae were able to adapt rapidly to either increasing or decreasing ambient irradiances. F/Fm' values were between 0.2 and 0.51, while Ek varied between 2.1 and 18 mol photons m-2 s-1. F/Fm', E k, and relative electron transfer rate (rETR) all varied sequentially over the course of a day. rETR and Ek were highest at midday at the highest irradiances, when there was apparent midday down regulation of photosynthesis, while F/Fm' was highest at midnight. The effects of natural UV radiation on sea ice were examined, but it was not possible to detect the effect of either UVB or UVA and UVB on photosynthesis. This was considered to be largely because of the large spatial and temporal heterogeneity of the under ice community, changing irradiances throughout the day and the relatively small change caused by UV. |
format |
Article in Journal/Newspaper |
author |
McMinn, A Ryan, K Gademann, R |
author_facet |
McMinn, A Ryan, K Gademann, R |
author_sort |
McMinn, A |
title |
Diurnal changes in photosynthesis of Antarctic fast ice algal communities determined by pulse amplitude modulation fluorometry |
title_short |
Diurnal changes in photosynthesis of Antarctic fast ice algal communities determined by pulse amplitude modulation fluorometry |
title_full |
Diurnal changes in photosynthesis of Antarctic fast ice algal communities determined by pulse amplitude modulation fluorometry |
title_fullStr |
Diurnal changes in photosynthesis of Antarctic fast ice algal communities determined by pulse amplitude modulation fluorometry |
title_full_unstemmed |
Diurnal changes in photosynthesis of Antarctic fast ice algal communities determined by pulse amplitude modulation fluorometry |
title_sort |
diurnal changes in photosynthesis of antarctic fast ice algal communities determined by pulse amplitude modulation fluorometry |
publisher |
Springer-Verlag |
publishDate |
2003 |
url |
https://doi.org/10.1007/s00227-003-1052-5 http://ecite.utas.edu.au/29148 |
geographic |
Antarctic McMurdo Sound |
geographic_facet |
Antarctic McMurdo Sound |
genre |
Antarc* Antarctic ice algae McMurdo Sound Sea ice |
genre_facet |
Antarc* Antarctic ice algae McMurdo Sound Sea ice |
op_relation |
http://dx.doi.org/10.1007/s00227-003-1052-5 McMinn, A and Ryan, K and Gademann, R, Diurnal changes in photosynthesis of Antarctic fast ice algal communities determined by pulse amplitude modulation fluorometry, Marine Biology, 143, (2) pp. 359-367. ISSN 0025-3162 (2003) [Refereed Article] http://ecite.utas.edu.au/29148 |
op_doi |
https://doi.org/10.1007/s00227-003-1052-5 |
container_title |
Marine Biology |
container_volume |
143 |
container_issue |
2 |
container_start_page |
359 |
op_container_end_page |
367 |
_version_ |
1766274769164959744 |