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

Resilience of SAR11 bacteria to rapid acidification in the high latitude open ocean
Resilience of SAR11 bacteria to rapid acidification in the high latitude open ocean
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.
CARD-FISH, flow cytometric cell sorting, isotopic tracer labelling, pCO2 perturbation
fiv161
Hartmann, Manuela
5b175765-fde7-40dc-bcd6-83248285ef86
Hill, Polly G.
03ff729d-1c24-45f8-8bf7-3bcc9bf882e9
Tynan, Eithne
dfed4bbd-ea2a-4ff9-81f5-de2af563943b
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Leakey, Raymond J. G.
3ff10ff8-14a1-4a65-9222-6f18441d59b0
Zubkov, Mikhail V.
b1dfb3a0-bcff-430c-9031-358a22b50743
Hartmann, Manuela
5b175765-fde7-40dc-bcd6-83248285ef86
Hill, Polly G.
03ff729d-1c24-45f8-8bf7-3bcc9bf882e9
Tynan, Eithne
dfed4bbd-ea2a-4ff9-81f5-de2af563943b
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Leakey, Raymond J. G.
3ff10ff8-14a1-4a65-9222-6f18441d59b0
Zubkov, Mikhail V.
b1dfb3a0-bcff-430c-9031-358a22b50743

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).

Record type: Article

Abstract

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.

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Published date: February 2016
Keywords: CARD-FISH, flow cytometric cell sorting, isotopic tracer labelling, pCO2 perturbation
Organisations: Ocean and Earth Science, Marine Biogeochemistry

Identifiers

Local EPrints ID: 390053
URI: http://eprints.soton.ac.uk/id/eprint/390053
PURE UUID: 05a1c0ac-9809-469d-a661-20a58613bf63

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Date deposited: 17 Mar 2016 14:11
Last modified: 28 Apr 2022 05:00

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Contributors

Author: Manuela Hartmann
Author: Polly G. Hill
Author: Eithne Tynan
Author: Raymond J. G. Leakey
Author: Mikhail V. Zubkov

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