Biogeosciences
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2008
10.5194/bg-5-157-2008
http://www.biogeosciences.net/5/157/2008/
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http://www.biogeosciences.net/5/157/2008/bg-5-157-2008.pdf
157
169
2008-02-08
Heterotrophic bacterial production in the eastern South Pacific: longitudinal trends and coupling with primary production
F. Van Wambeke
france.van-wambeke@univmed.fr
I. Obernosterer
T. Moutin
S. Duhamel
O. Ulloa
H. Claustre
Laboratoire de Microbiologie, Géochimie et Ecologie Marines (LMGEM), CNRS, UMR 6117, Université de la Méditerranée, Campus de Luminy – Case 901, 13288 Marseille cedex 9, France
Université Pierre et Marie Curie-Paris6, Laboratoire ARAGO, Avenue Fontaulé, BP44, 66650 Banyuls-sur-Mer, France
CNRS, UMR7621, Laboratoire d'Océanographie Biologique de Banyuls, Avenue Fontaulé, BP44, 66650 Banyuls-sur-Mer, France
Laboratoire d'Océanographie et de Biogéochimie (LOB), CNRS, UMR 6535, Université de la Méditerranée, Campus de Luminy – Case 901, 13288 Marseille cedex 9, France
Departmento de Oceanografía & Centro de Investigación Oceanográfica en el Pacífico Sur-Oriental, Universidad de Concepción, Casilla 160-C, Concepción, Chile
CNRS, Laboratoire d'océanographie de Villefranche, 06230 Villefranche-sur-Mer, France; Université Pierre et Marie Curie-Paris6, Laboratoire d'océanographie de Villefranche, 06230 Villefranche-sur-Mer, France
Spatial variation of heterotrophic bacterial production and phytoplankton
primary production were investigated across the eastern South Pacific Ocean
(−141° W, −8° S to −72° W, −35° S) in
November–December 2004. Bacterial production (<sup>3</sup>H leucine incorporation)
integrated over the euphotic zone encompassed a wide range of values, from
43 mg C m<sup>−2</sup> d<sup>−1</sup> in the hyper-oligotrophic South Pacific Gyre to
392 mg C m<sup>−2</sup> d<sup>−1</sup> in the upwelling off Chile. In the gyre (120° W,
22° S) records of low phytoplankton biomass (7 mg Total Chl<i>a</i> m<sup>−2</sup>)
were obtained and fluxes of in situ <sup>14</sup>C-based particulate primary
production were as low as 153 mg C m<sup>−2</sup> d<sup>−1</sup>, thus equal to the
value considered as a limit for primary production under strong oligotrophic
conditions. Average rates of <sup>3</sup>H leucine incorporation rates, and
leucine incorporation rates per cell (5–21 pmol l<sup>−1</sup> h<sup>−1</sup> and
15–56×10<sup>−21</sup> mol cell<sup>−1</sup> h<sup>−1</sup>, respectively) determined in the South
Pacific gyre, were in the same range as those reported for other
oligotrophic subtropical and temperate waters. Fluxes of dark community
respiration, determined at selected stations across the transect varied in a
narrow range (42–97 mmol O<sub>2</sub> m<sup>−2</sup> d<sup>−1</sup>), except for one station
in the upwelling off Chile (245 mmol O<sub>2</sub> m<sup>−2</sup> d<sup>−1</sup>). Bacterial
growth efficiencies varied between 5 and 38%. Bacterial carbon demand
largely exceeded <sup>14</sup>C particulate primary production across the South
Pacific Ocean, but was lower or equal to gross community production.
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