Articles | Volume 17, issue 16
Biogeosciences, 17, 4153–4171, 2020
https://doi.org/10.5194/bg-17-4153-2020
Biogeosciences, 17, 4153–4171, 2020
https://doi.org/10.5194/bg-17-4153-2020

Research article 18 Aug 2020

Research article | 18 Aug 2020

Ocean acidification reduces growth and grazing impact of Antarctic heterotrophic nanoflagellates

Stacy Deppeler et al.

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Cited articles

Aberle, N., Schulz, K. G., Stuhr, A., Malzahn, A. M., Ludwig, A., and Riebesell, U.: High tolerance of microzooplankton to ocean acidification in an Arctic coastal plankton community, Biogeosciences, 10, 1471–1481, https://doi.org/10.5194/bg-10-1471-2013, 2013. a, b
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. a, b
Archer, S. D., Leakey, R. J. G., Burkill, P. H., and Sleigh, M. A.: Microbial dynamics in coastal waters of East Antarctica: Herbivory by heterotrophic dinoflagellates, Mar. Ecol. Prog. Ser., 139, 239–255, https://doi.org/10.3354/meps139239, 1996. a
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, 2008. a
Azam, F. and Malfatti, F.: Microbial structuring of marine ecosystems, Nat. Rev. Microbiol., 5, 782–791, https://doi.org/10.1038/nrmicro1747, 2007. a, b, c
Short summary
Our study showed how ocean acidification can exert both direct and indirect influences on the interactions among trophic levels within the microbial loop. Microbial grazer abundance was reduced at CO2 concentrations at and above 634 µatm, while microbial communities increased in abundance, likely due to a reduction in being grazed. Such changes in predator–prey interactions with ocean acidification could have significant effects on the food web and biogeochemistry in the Southern Ocean.
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