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Contribution of bacterial respiration to plankton respiration from 50°N to 44°S in the Atlantic Ocean

Contribution of bacterial respiration to plankton respiration from 50°N to 44°S in the Atlantic Ocean
Contribution of bacterial respiration to plankton respiration from 50°N to 44°S in the Atlantic Ocean
Marine bacteria play an important role in the global cycling of carbon and therefore in climate regulation. However, the paucity of direct measurements means that our understanding of the magnitude and variability of bacterial respiration in the ocean is poor. Estimations of respiration in the 0.2–0.8 μm size-fraction (considered as bacterial respiration), total plankton community respiration, and the contribution of bacterial respiration to total plankton community respiration were made along two latitudinal transects in the Atlantic Ocean (ca. 50°N–44°S) during 2010 and 2011. Two different methodologies were used: determination of changes in dissolved O2 concentration after standard 24 h dark bottle incubations, and measurements of in vivo reduction of 2-(ρ-iodophenyl)-3-(ρ-nitrophenyl)-5phenyl tetrazolium salt (INT). There was an overall significant correlation (r = 0.44, p < 0.0001, n = 90) between the rates of community respiration estimated by both methods. Depth-integrated community respiration varied as much as threefold between regions. Maximum rates occurred in waters of the western European shelf and Patagonian shelf, and minimum rates in the North and South oligotrophic gyres. Depth-integrated bacterial respiration followed the same pattern as community respiration. There was a significantly higher cell-specific bacterial respiration in the northern subtropical gyre than in the southern subtropical gyre which suggests that bacterial carbon turnover is faster in the northern gyre. The relationships between plankton respiration and physicochemical and biological variables were different in different years. In general, INTT was correlated to both chlorophyll-a and bacterial abundance, while INT0.2–0.8 was only correlated with bacterial abundance. However, in 2010 INTT and INT0.2–0.8 were also correlated with temperature and primary production while in 2011 they were correlated with nitrate + nitrite concentration. The bacterial contribution to depth integrated community respiration was highly variable within provinces (4–77%). Results from this study suggest that the proportion of total community respiration attributable to bacteria is similar between the 6 oceanographic regions studied.
0079-6611
99-108
García-Martín, E.E.
9ef13e0f-4797-4ac3-ac8b-94522bbc4c56
Aranguren-Gassis, M.
16f631f5-2205-4045-a714-c173497cd6cf
Hartmann, M.
5b175765-fde7-40dc-bcd6-83248285ef86
Zubkov, M.V.
b1dfb3a0-bcff-430c-9031-358a22b50743
Serret, P.
b58041c5-1a45-4670-8e17-5ce5225c893a
García-Martín, E.E.
9ef13e0f-4797-4ac3-ac8b-94522bbc4c56
Aranguren-Gassis, M.
16f631f5-2205-4045-a714-c173497cd6cf
Hartmann, M.
5b175765-fde7-40dc-bcd6-83248285ef86
Zubkov, M.V.
b1dfb3a0-bcff-430c-9031-358a22b50743
Serret, P.
b58041c5-1a45-4670-8e17-5ce5225c893a

García-Martín, E.E., Aranguren-Gassis, M., Hartmann, M., Zubkov, M.V. and Serret, P. (2017) Contribution of bacterial respiration to plankton respiration from 50°N to 44°S in the Atlantic Ocean. Progress in Oceanography, 158, 99-108. (doi:10.1016/j.pocean.2016.11.006).

Record type: Article

Abstract

Marine bacteria play an important role in the global cycling of carbon and therefore in climate regulation. However, the paucity of direct measurements means that our understanding of the magnitude and variability of bacterial respiration in the ocean is poor. Estimations of respiration in the 0.2–0.8 μm size-fraction (considered as bacterial respiration), total plankton community respiration, and the contribution of bacterial respiration to total plankton community respiration were made along two latitudinal transects in the Atlantic Ocean (ca. 50°N–44°S) during 2010 and 2011. Two different methodologies were used: determination of changes in dissolved O2 concentration after standard 24 h dark bottle incubations, and measurements of in vivo reduction of 2-(ρ-iodophenyl)-3-(ρ-nitrophenyl)-5phenyl tetrazolium salt (INT). There was an overall significant correlation (r = 0.44, p < 0.0001, n = 90) between the rates of community respiration estimated by both methods. Depth-integrated community respiration varied as much as threefold between regions. Maximum rates occurred in waters of the western European shelf and Patagonian shelf, and minimum rates in the North and South oligotrophic gyres. Depth-integrated bacterial respiration followed the same pattern as community respiration. There was a significantly higher cell-specific bacterial respiration in the northern subtropical gyre than in the southern subtropical gyre which suggests that bacterial carbon turnover is faster in the northern gyre. The relationships between plankton respiration and physicochemical and biological variables were different in different years. In general, INTT was correlated to both chlorophyll-a and bacterial abundance, while INT0.2–0.8 was only correlated with bacterial abundance. However, in 2010 INTT and INT0.2–0.8 were also correlated with temperature and primary production while in 2011 they were correlated with nitrate + nitrite concentration. The bacterial contribution to depth integrated community respiration was highly variable within provinces (4–77%). Results from this study suggest that the proportion of total community respiration attributable to bacteria is similar between the 6 oceanographic regions studied.

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Accepted/In Press date: 16 November 2016
Published date: 1 November 2017

Identifiers

Local EPrints ID: 416562
URI: http://eprints.soton.ac.uk/id/eprint/416562
ISSN: 0079-6611
PURE UUID: dee4165d-46a2-46fa-a83e-55b176c2159f

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Date deposited: 03 Jan 2018 17:30
Last modified: 15 Mar 2024 17:42

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Contributors

Author: E.E. García-Martín
Author: M. Aranguren-Gassis
Author: M. Hartmann
Author: M.V. Zubkov
Author: P. Serret

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