Resilience of SAR11 bacteria to rapid acidification in the high latitude open ocean

Hartmann, Manuela, Hill, Polly G., Tynan, Eithne, Achterberg, Eric P., Leakey, Raymond J. G. and Zubkov, Mikhail V. (2016) Resilience of SAR11 bacteria to rapid acidification in the high latitude open ocean FEMS Microbiology Ecology, 92 (2). fiv161. DOI 10.1093/femsec/fiv161.

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Ubiquitous SAR11 Alphaproteobacteria numerically dominate marine planktonic communities. Because they are excruciatingly difficult to cultivate, there is comparatively little known about their physiology and metabolic responses to long- and short-term environmental changes. As surface oceans take up anthropogenic, atmospheric CO2, the consequential process of ocean acidification could affect the global biogeochemical significance of SAR11. Shipping accidents or inadvertent release of chemicals from industrial plants can have strong short-term local effects on oceanic SAR11. This study investigated the effect of 2.5-fold acidification of seawater on the metabolism of SAR11 and other heterotrophic bacterioplankton along a natural temperature gradient crossing the North Atlantic Ocean, Norwegian and Greenland Seas. Uptake rates of the amino acid leucine by SAR11 cells as well as other bacterioplankton remained similar to controls despite an instant ∼50% increase in leucine bioavailability upon acidification. This high physiological resilience to acidification even without acclimation, suggests that open ocean dominant bacterioplankton are able to cope even with sudden and therefore more likely with long-term acidification effects.

Document Type: Article
Additional Information: WOS:000371249600007
Keywords: CARD-FISH; flow cytometric cell sorting; isotopic tracer labelling; pCO2 perturbation; RRS James Clark Ross, JR271
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Kiel University
Refereed: Yes
DOI etc.: 10.1093/femsec/fiv161
ISSN: 0168-6496
Projects: NERC, Future Ocean
Date Deposited: 05 Apr 2016 07:55
Last Modified: 19 Dec 2017 12:47

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