Arctic microbial community dynamics influenced by elevated CO2 levels.

Brussaard, C. P. D., Noordeloos, A. A. M., Witte, H., Collenteur, M. C. J., Schulz, Kai G., Ludwig, Andrea and Riebesell, Ulf (2013) Arctic microbial community dynamics influenced by elevated CO2 levels. Open Access Biogeosciences (BG), 10 (2). pp. 719-731. DOI 10.5194/bg-10-719-2013.

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Abstract

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.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/211384
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-10-719-2013
ISSN: 1726-4170
Projects: EPOCA, MESOAQUA, Future Ocean
Expeditions/Models/Experiments:
Date Deposited: 04 Dec 2012 09:06
Last Modified: 26 Jul 2016 11:13
URI: http://oceanrep.geomar.de/id/eprint/19476

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