Acclimatization of Antarctic natural phytoplankton assemblages when exposed to solar ultraviolet radiation
The effects of solar ultraviolet radiation (UVR) on photosynthetic rates of natural assemblages of Antarctic phytoplankton were determined in both 1 day and 2 week incubations during austral spring at Palmer Station, Antarctica. During the first day of the long-term incubations, photosynthetic rates...
Published in: | Journal of Plankton Research |
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Oxford University Press
1995
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fthighwire:oai:open-archive.highwire.org:plankt:17/12/2295 2023-05-15T13:41:00+02:00 Acclimatization of Antarctic natural phytoplankton assemblages when exposed to solar ultraviolet radiation Villafañe, Virginia E. Helbling, E.Walter Holm-Hansen, Osmund Chalker, Bruce E. 1995-12-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/17/12/2295 https://doi.org/10.1093/plankt/17.12.2295 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/17/12/2295 http://dx.doi.org/10.1093/plankt/17.12.2295 Copyright (C) 1995, Oxford University Press ORIGINAL ARTICLES TEXT 1995 fthighwire https://doi.org/10.1093/plankt/17.12.2295 2013-05-28T03:27:01Z The effects of solar ultraviolet radiation (UVR) on photosynthetic rates of natural assemblages of Antarctic phytoplankton were determined in both 1 day and 2 week incubations during austral spring at Palmer Station, Antarctica. During the first day of the long-term incubations, photosynthetic rates were enhanced by ∼40% when UV-B radiation was excluded from the culture and by an additional 80% when UV-A radiation was also excluded. In spite of this UVR-induced photoinhi-bition of photosynthetic rates during the first day of each long-term experiment, cultures with and without exposure to UVR both showed exponential growth after the first few days, so that at the end of the 2 week growth period the chlorophyll- a concentrations in the samples grown with exposure to UVR were quite similar to those in the cultures from which UVR had been excluded. Phytoplankton organic carbon concentrations increased at rates comparable to those of chlorophyll concentrations during the long-term experiments. The effects of UVR were evident, however, in changes in the Holistic and chemical composition of the phytoplankton during the long-term incubations. The proportion of the phytoplankton biomass accounted for by diatoms in the cultures exposed to UVR increased, while that of flagellates deceased. Cultures exposed to UVR also showed higher concentrations of UV-absorbing compounds as compared to cultures grown without exposure to UVR. This apparent acclimatization of the cultures to UVR was reflected in decreased sensitivity to UVR when the responses of subsamples were determined in 1 day incubation tests. Text Antarc* Antarctic Antarctica HighWire Press (Stanford University) Antarctic Austral Palmer Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Palmer-Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Journal of Plankton Research 17 12 2295 2306 |
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Open Polar |
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HighWire Press (Stanford University) |
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fthighwire |
language |
English |
topic |
ORIGINAL ARTICLES |
spellingShingle |
ORIGINAL ARTICLES Villafañe, Virginia E. Helbling, E.Walter Holm-Hansen, Osmund Chalker, Bruce E. Acclimatization of Antarctic natural phytoplankton assemblages when exposed to solar ultraviolet radiation |
topic_facet |
ORIGINAL ARTICLES |
description |
The effects of solar ultraviolet radiation (UVR) on photosynthetic rates of natural assemblages of Antarctic phytoplankton were determined in both 1 day and 2 week incubations during austral spring at Palmer Station, Antarctica. During the first day of the long-term incubations, photosynthetic rates were enhanced by ∼40% when UV-B radiation was excluded from the culture and by an additional 80% when UV-A radiation was also excluded. In spite of this UVR-induced photoinhi-bition of photosynthetic rates during the first day of each long-term experiment, cultures with and without exposure to UVR both showed exponential growth after the first few days, so that at the end of the 2 week growth period the chlorophyll- a concentrations in the samples grown with exposure to UVR were quite similar to those in the cultures from which UVR had been excluded. Phytoplankton organic carbon concentrations increased at rates comparable to those of chlorophyll concentrations during the long-term experiments. The effects of UVR were evident, however, in changes in the Holistic and chemical composition of the phytoplankton during the long-term incubations. The proportion of the phytoplankton biomass accounted for by diatoms in the cultures exposed to UVR increased, while that of flagellates deceased. Cultures exposed to UVR also showed higher concentrations of UV-absorbing compounds as compared to cultures grown without exposure to UVR. This apparent acclimatization of the cultures to UVR was reflected in decreased sensitivity to UVR when the responses of subsamples were determined in 1 day incubation tests. |
format |
Text |
author |
Villafañe, Virginia E. Helbling, E.Walter Holm-Hansen, Osmund Chalker, Bruce E. |
author_facet |
Villafañe, Virginia E. Helbling, E.Walter Holm-Hansen, Osmund Chalker, Bruce E. |
author_sort |
Villafañe, Virginia E. |
title |
Acclimatization of Antarctic natural phytoplankton assemblages when exposed to solar ultraviolet radiation |
title_short |
Acclimatization of Antarctic natural phytoplankton assemblages when exposed to solar ultraviolet radiation |
title_full |
Acclimatization of Antarctic natural phytoplankton assemblages when exposed to solar ultraviolet radiation |
title_fullStr |
Acclimatization of Antarctic natural phytoplankton assemblages when exposed to solar ultraviolet radiation |
title_full_unstemmed |
Acclimatization of Antarctic natural phytoplankton assemblages when exposed to solar ultraviolet radiation |
title_sort |
acclimatization of antarctic natural phytoplankton assemblages when exposed to solar ultraviolet radiation |
publisher |
Oxford University Press |
publishDate |
1995 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/17/12/2295 https://doi.org/10.1093/plankt/17.12.2295 |
long_lat |
ENVELOPE(-64.050,-64.050,-64.770,-64.770) ENVELOPE(-64.050,-64.050,-64.770,-64.770) |
geographic |
Antarctic Austral Palmer Station Palmer-Station |
geographic_facet |
Antarctic Austral Palmer Station Palmer-Station |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/17/12/2295 http://dx.doi.org/10.1093/plankt/17.12.2295 |
op_rights |
Copyright (C) 1995, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/17.12.2295 |
container_title |
Journal of Plankton Research |
container_volume |
17 |
container_issue |
12 |
container_start_page |
2295 |
op_container_end_page |
2306 |
_version_ |
1766144293794217984 |