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Volume 15, issue 1
Biogeosciences, 15, 209–231, 2018
https://doi.org/10.5194/bg-15-209-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: The Ocean in a High-CO2 World IV

Biogeosciences, 15, 209–231, 2018
https://doi.org/10.5194/bg-15-209-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 11 Jan 2018

Research article | 11 Jan 2018

Ocean acidification of a coastal Antarctic marine microbial community reveals a critical threshold for CO2 tolerance in phytoplankton productivity

Stacy Deppeler et al.

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Cited articles

Allgaier, M., Riebesell, U., Vogt, M., Thyrhaug, R., and Grossart, H.-P.: Coupling of heterotrophic bacteria to phytoplankton bloom development at different pCO2 levels: a mesocosm study, Biogeosciences, 5, 1007–1022, https://doi.org/10.5194/bg-5-1007-2008, 2008.
Arrigo, K. R., van Dijken, G. L., and Bushinsky, S.: Primary production in the Southern Ocean, 1997–2006, J. Geophys. Res.-Ocean., 113, C08004, https://doi.org/10.1029/2007JC004551, 2008a.
Arrigo, K. R., van Dijken, G. L., and Long, M.: Coastal Southern Ocean: A strong anthropogenic CO2 sink, Geophys. Res. Lett., 35, L21602, https://doi.org/10.1029/2008GL035624, 2008b.
Azam, F., Fenchel, T., Field, J. G., Gray, J. C., Meyer-Reil, L. A., and Thingstad, F.: The ecological role of water-column microbes in the sea, Mar. Ecol. Prog. Ser., 10, 257–264, https://doi.org/10.3354/meps010257, 1983.
Azam, F., Smith, D. C., and Hollibaugh, J. T.: The role of the microbial loop in Antarctic pelagic ecosystems, Polar Res., 10, 239–243, https://doi.org/10.1111/j.1751-8369.1991.tb00649.x, 1991.
Publications Copernicus
Short summary
We combined productivity and photophysiology measurements to investigate the effects of ocean acidification on a natural Antarctic marine microbial community. Our study identifies a threshold for CO2 tolerance in the phytoplankton community between 953 and 1140 μatm of CO2, above which productivity declines. Bacteria were tolerant to CO2 up to 1641 μatm. We identify physiological changes in the phytoplankton at high CO2 that allowed them to acclimate to the high CO2 treatment.
We combined productivity and photophysiology measurements to investigate the effects of ocean...
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