Arctic microbial community dynamics influenced by elevated CO2 levels
By C. Brussaard, A. Noordeloos, H. Witte, M. C. J. Collenteur, K. Schulz, A. Ludwig, U. Riebesell. 2012
156 citations recorded by the source corpus.
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.
Subfields: Ecology, Oceanography
View Paper: https://www.semanticscholar.org/paper/c586d256a366ff25ff30619c34d805c7df7bb291
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Citations in the corpus
- Rethinking the marine carbon cycle: Factoring in the multifarious lifestyles of microbes (2015, background): “A shift toward smaller phytoplankton, as observed with warming in the Arctic and in ocean acidification experiments, favors nanoflagellate grazers over larger predators (50, 97).”