Skip Navigation

This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (11)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Borgeraas, J.
Right arrow Articles by Hessen, D. O.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Borgeraas, J.
Right arrow Articles by Hessen, D. O.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Journal of Plankton Research Vol.22 no.6 pp.1167-1183, 2000
© Oxford University Press 2000

UV-B induced mortality and antioxidant enzyme activities in Daphnia magna at different oxygen concentrations and temperatures

Jan Borgeraas and Dag O. Hessen

University of Oslo, Department of Biology, PO Box 1027 Blindern, 0316 Oslo, Norway

Survival of adult Daphnia magna was assessed after acute (<96 h) exposure to UV312 under various temperatures (6, 12 and 18°C) or oxygen concentrations (5.6, 8.5 and 14.1 mg O2 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 UV312 (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.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 J PLANKTON RESHome page
P. E. Garcia, A. P. Perez, M. d. C. Dieguez, M. A. Ferraro, and H. E. Zagarese
Dual control of the levels of photoprotective compounds by ultraviolet radiation and temperature in the freshwater copepod Boeckella antiqua
J. Plankton Res., July 1, 2008; 30(7): 817 - 827.
[Abstract] [Full Text] [PDF]


Disclaimer:
Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.