UV-B induced mortality and antioxidant enzyme activities in Daphnia magna at different oxygen concentrations and temperatures
Survival of adult Daphnia magna was assessed after acute (<96 h) exposure to UV 312 under various temperatures (6, 12 and 18°C) or oxygen concentrations (5.6, 8.5 and 14.1 mg O 2 l–1) in the laboratory. The surviving animals were screened for the enzymes catalase (CAT) and glutathione transferase...
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2000
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fthighwire:oai:open-archive.highwire.org:plankt:22/6/1167 2023-05-15T15:07:43+02:00 UV-B induced mortality and antioxidant enzyme activities in Daphnia magna at different oxygen concentrations and temperatures Borgeraas, Jan Hessen, Dag O. 2000-06-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/22/6/1167 https://doi.org/10.1093/plankt/22.6.1167 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/22/6/1167 http://dx.doi.org/10.1093/plankt/22.6.1167 Copyright (C) 2000, Oxford University Press ORIGINAL ARTICLES TEXT 2000 fthighwire https://doi.org/10.1093/plankt/22.6.1167 2007-06-24T18:14:42Z Survival of adult Daphnia magna was assessed after acute (<96 h) exposure to UV 312 under various temperatures (6, 12 and 18°C) or oxygen concentrations (5.6, 8.5 and 14.1 mg O 2 l–1) in the laboratory. The surviving animals were screened for the enzymes catalase (CAT) and glutathione transferase (GST), which may protect against UV-induced oxidative damage. In addition, the same two enzymes were assayed in separate experiments after acute exposure to UV 312 (6 h, 0.014 mW cm–2) and the different levels of temperature and oxygen. No differences were observed in either CAT or GST activity after exposure to the three levels of oxygen, but there was a tendency for decreasing specific activity with decreasing temperature for both enzymes. CAT activity was not influenced by UV radiation, whereas GST activity displayed a slight increase. Oxygen concentration did not influence survival during UV exposure but, contrary to expectations, survival tests at different temperatures clearly showed that reduced temperature increased survival. The results indicate that temperature effects must be considered when comparing dose effect relationships in situ , and suggest that low temperature is not a major cause of UV susceptibility in cold-adapted alpine and Arctic populations of Daphnia . Text Arctic HighWire Press (Stanford University) Arctic Journal of Plankton Research 22 6 1167 1183 |
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Open Polar |
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HighWire Press (Stanford University) |
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fthighwire |
language |
English |
topic |
ORIGINAL ARTICLES |
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ORIGINAL ARTICLES Borgeraas, Jan Hessen, Dag O. UV-B induced mortality and antioxidant enzyme activities in Daphnia magna at different oxygen concentrations and temperatures |
topic_facet |
ORIGINAL ARTICLES |
description |
Survival of adult Daphnia magna was assessed after acute (<96 h) exposure to UV 312 under various temperatures (6, 12 and 18°C) or oxygen concentrations (5.6, 8.5 and 14.1 mg O 2 l–1) in the laboratory. The surviving animals were screened for the enzymes catalase (CAT) and glutathione transferase (GST), which may protect against UV-induced oxidative damage. In addition, the same two enzymes were assayed in separate experiments after acute exposure to UV 312 (6 h, 0.014 mW cm–2) and the different levels of temperature and oxygen. No differences were observed in either CAT or GST activity after exposure to the three levels of oxygen, but there was a tendency for decreasing specific activity with decreasing temperature for both enzymes. CAT activity was not influenced by UV radiation, whereas GST activity displayed a slight increase. Oxygen concentration did not influence survival during UV exposure but, contrary to expectations, survival tests at different temperatures clearly showed that reduced temperature increased survival. The results indicate that temperature effects must be considered when comparing dose effect relationships in situ , and suggest that low temperature is not a major cause of UV susceptibility in cold-adapted alpine and Arctic populations of Daphnia . |
format |
Text |
author |
Borgeraas, Jan Hessen, Dag O. |
author_facet |
Borgeraas, Jan Hessen, Dag O. |
author_sort |
Borgeraas, Jan |
title |
UV-B induced mortality and antioxidant enzyme activities in Daphnia magna at different oxygen concentrations and temperatures |
title_short |
UV-B induced mortality and antioxidant enzyme activities in Daphnia magna at different oxygen concentrations and temperatures |
title_full |
UV-B induced mortality and antioxidant enzyme activities in Daphnia magna at different oxygen concentrations and temperatures |
title_fullStr |
UV-B induced mortality and antioxidant enzyme activities in Daphnia magna at different oxygen concentrations and temperatures |
title_full_unstemmed |
UV-B induced mortality and antioxidant enzyme activities in Daphnia magna at different oxygen concentrations and temperatures |
title_sort |
uv-b induced mortality and antioxidant enzyme activities in daphnia magna at different oxygen concentrations and temperatures |
publisher |
Oxford University Press |
publishDate |
2000 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/22/6/1167 https://doi.org/10.1093/plankt/22.6.1167 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/22/6/1167 http://dx.doi.org/10.1093/plankt/22.6.1167 |
op_rights |
Copyright (C) 2000, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/22.6.1167 |
container_title |
Journal of Plankton Research |
container_volume |
22 |
container_issue |
6 |
container_start_page |
1167 |
op_container_end_page |
1183 |
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1766339150215118848 |