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| Titel |
Arctic microbial community dynamics influenced by elevated CO2 levels |
| VerfasserIn |
C. P. D. Brussaard, A. A. M. Noordeloos, H. Witte, M. C. J. Collenteur, K. Schulz, A. Ludwig, U. Riebesell |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 2 ; Nr. 10, no. 2 (2013-02-01), S.719-731 |
| Datensatznummer |
250017498
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| Publikation (Nr.) |
 copernicus.org/bg-10-719-2013.pdf |
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| Zusammenfassung |
| The Arctic Ocean ecosystem is particularly vulnerable to ocean acidification
(OA) related alterations due to the relatively high CO2 solubility and
low carbonate saturation states of its cold surface waters. Thus far,
however, there is only little known about the consequences of OA on the base
of the food web. In a mesocosm CO2-enrichment experiment (overall
CO2 levels ranged from ~ 180 to 1100 μatm) in
Kongsfjorden off Svalbard, we studied the consequences of OA on a natural
pelagic microbial community. OA distinctly affected the composition and
growth of the Arctic phytoplankton community, i.e. the picoeukaryotic
photoautotrophs and to a lesser extent the nanophytoplankton thrived. A
shift towards the smallest phytoplankton as a result of OA will have direct
consequences for the structure and functioning of the pelagic food web and
thus for the biogeochemical cycles. Besides being grazed, the dominant pico-
and nanophytoplankton groups were found prone to viral lysis, thereby
shunting the carbon accumulation in living organisms into the dissolved
pools of organic carbon and subsequently affecting the efficiency of the
biological pump in these Arctic waters. |
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