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| Titel |
Heterotrophic bacterial production in the eastern South Pacific: longitudinal trends and coupling with primary production |
| VerfasserIn |
F. Wambeke, I. Obernosterer, T. Moutin, S. Duhamel, O. Ulloa, H. Claustre |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 5, no. 1 ; Nr. 5, no. 1 (2008-02-08), S.157-169 |
| Datensatznummer |
250002235
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| Publikation (Nr.) |
 copernicus.org/bg-5-157-2008.pdf |
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| Zusammenfassung |
| 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 (3H leucine incorporation)
integrated over the euphotic zone encompassed a wide range of values, from
43 mg C m−2 d−1 in the hyper-oligotrophic South Pacific Gyre to
392 mg C m−2 d−1 in the upwelling off Chile. In the gyre (120° W,
22° S) records of low phytoplankton biomass (7 mg Total Chla m−2)
were obtained and fluxes of in situ 14C-based particulate primary
production were as low as 153 mg C m−2 d−1, thus equal to the
value considered as a limit for primary production under strong oligotrophic
conditions. Average rates of 3H leucine incorporation rates, and
leucine incorporation rates per cell (5–21 pmol l−1 h−1 and
15–56×10−21 mol cell−1 h−1, 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 O2 m−2 d−1), except for one station
in the upwelling off Chile (245 mmol O2 m−2 d−1). Bacterial
growth efficiencies varied between 5 and 38%. Bacterial carbon demand
largely exceeded 14C particulate primary production across the South
Pacific Ocean, but was lower or equal to gross community production. |
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