UV radiation - a threat to Antarctic benthic marine diatoms?
Abstract This investigation was motivated by the lack of ultraviolet radiation (UVR, 280–400 nm) studies on Antarctic benthic marine microalgae. The objective was to estimate the impact of UV-B (280–315 nm) and UV-A (315–400 nm), on photosynthetic efficiency, species composition, cell density and sp...
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crcambridgeupr:10.1017/s0954102007000739 2024-09-15T17:44:23+00:00 UV radiation - a threat to Antarctic benthic marine diatoms? Wulff, Angela Zacher, Katharina Hanelt, Dieter Al-Handal, Adil Wiencke, Christian 2007 http://dx.doi.org/10.1017/s0954102007000739 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102007000739 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 20, issue 1, page 13-20 ISSN 0954-1020 1365-2079 journal-article 2007 crcambridgeupr https://doi.org/10.1017/s0954102007000739 2024-07-24T04:03:50Z Abstract This investigation was motivated by the lack of ultraviolet radiation (UVR, 280–400 nm) studies on Antarctic benthic marine microalgae. The objective was to estimate the impact of UV-B (280–315 nm) and UV-A (315–400 nm), on photosynthetic efficiency, species composition, cell density and specific growth rate in a semi-natural soft-bottom diatom community. In both experiments, cell density increased over time. The most frequently observed species were Navicula cancellata , Cylindrotheca closterium , Nitzschia spp., and Petroneis plagiostoma . For both experiments, a shift in species composition and a decreased photosystem II (PSII) maximum efficiency (F v /F m ) over time was observed, irrespective of treatment. UVR significantly reduced F v /F m on days 3 and 10 (Expt 1), disappearing on the last sampling date. A similar trend was found in Expt 2. A significant UV effect on cell density was observed in Expt 1 (day 10) but not in Expt 2. No treatment effects on species composition or specific growth rate were found. Thus, the UV effects were transient (photosynthetic efficiency and cell density) and the growth of the benthic diatoms was generally unaffected. Overall, according to our results, UVR does not seem to be a threat to benthic marine Antarctic diatoms. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Cambridge University Press Antarctic Science 20 1 13 20 |
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Open Polar |
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Cambridge University Press |
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language |
English |
description |
Abstract This investigation was motivated by the lack of ultraviolet radiation (UVR, 280–400 nm) studies on Antarctic benthic marine microalgae. The objective was to estimate the impact of UV-B (280–315 nm) and UV-A (315–400 nm), on photosynthetic efficiency, species composition, cell density and specific growth rate in a semi-natural soft-bottom diatom community. In both experiments, cell density increased over time. The most frequently observed species were Navicula cancellata , Cylindrotheca closterium , Nitzschia spp., and Petroneis plagiostoma . For both experiments, a shift in species composition and a decreased photosystem II (PSII) maximum efficiency (F v /F m ) over time was observed, irrespective of treatment. UVR significantly reduced F v /F m on days 3 and 10 (Expt 1), disappearing on the last sampling date. A similar trend was found in Expt 2. A significant UV effect on cell density was observed in Expt 1 (day 10) but not in Expt 2. No treatment effects on species composition or specific growth rate were found. Thus, the UV effects were transient (photosynthetic efficiency and cell density) and the growth of the benthic diatoms was generally unaffected. Overall, according to our results, UVR does not seem to be a threat to benthic marine Antarctic diatoms. |
format |
Article in Journal/Newspaper |
author |
Wulff, Angela Zacher, Katharina Hanelt, Dieter Al-Handal, Adil Wiencke, Christian |
spellingShingle |
Wulff, Angela Zacher, Katharina Hanelt, Dieter Al-Handal, Adil Wiencke, Christian UV radiation - a threat to Antarctic benthic marine diatoms? |
author_facet |
Wulff, Angela Zacher, Katharina Hanelt, Dieter Al-Handal, Adil Wiencke, Christian |
author_sort |
Wulff, Angela |
title |
UV radiation - a threat to Antarctic benthic marine diatoms? |
title_short |
UV radiation - a threat to Antarctic benthic marine diatoms? |
title_full |
UV radiation - a threat to Antarctic benthic marine diatoms? |
title_fullStr |
UV radiation - a threat to Antarctic benthic marine diatoms? |
title_full_unstemmed |
UV radiation - a threat to Antarctic benthic marine diatoms? |
title_sort |
uv radiation - a threat to antarctic benthic marine diatoms? |
publisher |
Cambridge University Press (CUP) |
publishDate |
2007 |
url |
http://dx.doi.org/10.1017/s0954102007000739 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102007000739 |
genre |
Antarc* Antarctic Antarctic Science |
genre_facet |
Antarc* Antarctic Antarctic Science |
op_source |
Antarctic Science volume 20, issue 1, page 13-20 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102007000739 |
container_title |
Antarctic Science |
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20 |
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1 |
container_start_page |
13 |
op_container_end_page |
20 |
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1810491911310409728 |