Effects of ultraviolet-B radiation on two arctic microbial food webs.
The impact of UVB radiation on arctic planktonic microbial communities was examined in 2 shipboard experiments conducted on the northeast coast of Greenland, using water from a sea-ice meltwater pond and a land pond. The experiments were designed as a preliminary investigation of the interaction of...
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ftpubman:oai:pure.mpg.de:item_1508215 2023-08-27T04:07:32+02:00 Effects of ultraviolet-B radiation on two arctic microbial food webs. Wickham, S. Carstens, M. 1998-11-27 application/pdf http://hdl.handle.net/11858/00-001M-0000-000F-E132-1 http://hdl.handle.net/21.11116/0000-000C-10CC-C eng eng http://hdl.handle.net/11858/00-001M-0000-000F-E132-1 http://hdl.handle.net/21.11116/0000-000C-10CC-C Aquatic Microbial Ecology info:eu-repo/semantics/article 1998 ftpubman 2023-08-02T01:33:03Z The impact of UVB radiation on arctic planktonic microbial communities was examined in 2 shipboard experiments conducted on the northeast coast of Greenland, using water from a sea-ice meltwater pond and a land pond. The experiments were designed as a preliminary investigation of the interaction of WE and grazer effects on microbial communities, in order to evaluate the net effect of UVB on intact communities. We used Mylar bags to remove the natural levels of UVB, and a variation of the Landry-Hassett type dilution design to manipulate grazer abundance. The experiments allowed UVB effects to be scaled relative to grazing intensity and to growth in the absence of grazing. UVB effects on ciliates and rotifers were highly species-specific and ranged from no growth rate enhancement with the removal of UVB, to strong enhancement, and even to higher numbers in the presence, rather than absence, of UVB. Removal of UVB had Little or no effect on heterotrophic flagellates. Nano- and picoplanktonic algae were suppressed by UVB in only 1 experiment, and bacteria showed no enhancement in the absence of UVB in either experiment. When UVB effects occurred in nano- or picoautotrophs or HNF, they were substantially smaller than the mortality produced through grazing. It would appear that at current UVB levels, community-level deleterious effects of UVB on arctic microbial food webs can be difficult to discern, due to the species-specificity of the effects. Article in Journal/Newspaper Arctic Greenland Sea ice Max Planck Society: MPG.PuRe Arctic Greenland |
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Max Planck Society: MPG.PuRe |
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English |
description |
The impact of UVB radiation on arctic planktonic microbial communities was examined in 2 shipboard experiments conducted on the northeast coast of Greenland, using water from a sea-ice meltwater pond and a land pond. The experiments were designed as a preliminary investigation of the interaction of WE and grazer effects on microbial communities, in order to evaluate the net effect of UVB on intact communities. We used Mylar bags to remove the natural levels of UVB, and a variation of the Landry-Hassett type dilution design to manipulate grazer abundance. The experiments allowed UVB effects to be scaled relative to grazing intensity and to growth in the absence of grazing. UVB effects on ciliates and rotifers were highly species-specific and ranged from no growth rate enhancement with the removal of UVB, to strong enhancement, and even to higher numbers in the presence, rather than absence, of UVB. Removal of UVB had Little or no effect on heterotrophic flagellates. Nano- and picoplanktonic algae were suppressed by UVB in only 1 experiment, and bacteria showed no enhancement in the absence of UVB in either experiment. When UVB effects occurred in nano- or picoautotrophs or HNF, they were substantially smaller than the mortality produced through grazing. It would appear that at current UVB levels, community-level deleterious effects of UVB on arctic microbial food webs can be difficult to discern, due to the species-specificity of the effects. |
format |
Article in Journal/Newspaper |
author |
Wickham, S. Carstens, M. |
spellingShingle |
Wickham, S. Carstens, M. Effects of ultraviolet-B radiation on two arctic microbial food webs. |
author_facet |
Wickham, S. Carstens, M. |
author_sort |
Wickham, S. |
title |
Effects of ultraviolet-B radiation on two arctic microbial food webs. |
title_short |
Effects of ultraviolet-B radiation on two arctic microbial food webs. |
title_full |
Effects of ultraviolet-B radiation on two arctic microbial food webs. |
title_fullStr |
Effects of ultraviolet-B radiation on two arctic microbial food webs. |
title_full_unstemmed |
Effects of ultraviolet-B radiation on two arctic microbial food webs. |
title_sort |
effects of ultraviolet-b radiation on two arctic microbial food webs. |
publishDate |
1998 |
url |
http://hdl.handle.net/11858/00-001M-0000-000F-E132-1 http://hdl.handle.net/21.11116/0000-000C-10CC-C |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Sea ice |
genre_facet |
Arctic Greenland Sea ice |
op_source |
Aquatic Microbial Ecology |
op_relation |
http://hdl.handle.net/11858/00-001M-0000-000F-E132-1 http://hdl.handle.net/21.11116/0000-000C-10CC-C |
_version_ |
1775348304199024640 |