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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.; Zubkov, Mikhail V.. 2016 Resilience of SAR11 bacteria to rapid acidification in the high latitude open ocean. FEMS Microbiology Ecology, 92 (2). fiv161. 10.1093/femsec/fiv161

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Copyright © 2016 Oxford University Press This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Geophysical Journal International following peer review. The definitive publisher-authenticated version is available online at: doi:10.1093/femsec/fiv161
femsec.fiv161.full.pdf - Accepted Version

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Abstract/Summary

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.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1093/femsec/fiv161
ISSN: 1574-6941
Additional Keywords: CARD-FISH; flow cytometric cell sorting; isotopic tracer labelling; pCO2 perturbation
Date made live: 17 Mar 2016 14:34 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/513281

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