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Title: Large-scale variability in surface bacterial carbon demand and growth efficiency in the subtropical northeast Atlantic Ocean
Authors: Alonso-Sáez, Laura
Gasol, Josep M.
Arístegui, Javier 
Vilas, Juan C.
Vaqué, Dolors
Duarte, Carlos M.
Agustí, Susana
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Dissolved Organic-Matter
Net Community Production
Free Amino-Acids
Bacterioplankton Growth, et al
Issue Date: 2007
Publisher: 0024-3590
Journal: Limnology and Oceanography 
Abstract: We present surface estimates of bacterial respiration, bacterial heterotrophic production (BHP), and bacterial growth efficiency (BGE), and their relationship with nutrient availability, along a trophic gradient from coastal upwelling waters to the open‐ocean waters of the eastern North Atlantic. Bacterial respiration generally ranged between 10 and 30 µg C L−1 d−1 and was relatively unaffected by nutrient enrichment. In contrast, BHP showed higher variability (more than one order‐of‐magnitude range) and was affected by carbon and/or phosphorus additions in different regions. Empirical bacterial carbon‐to‐leucine (Leu) conversion factors (CFs) (range, 0.02–1.29 kg C mol Leu−1) decreased from the coast to the open ocean, largely influencing the BHP estimates in oligotrophic waters. We found high percentages of Leu respiration in oceanic waters (average 68% of Leu taken up by bacteria), possibly related to the low CFs found offshore. Empirical CFs were highly correlated to BGE (Pearson correlation coefficient r = 0.86, n = 12, p < 0.0004, log‐log transformed), which varied between 1% in offshore waters and 56% in the upwelling waters. Empirical CFs could be critical not only for accurately constraining BHP, but probably also for predicting BGE in oceanic waters.
ISSN: 0024-3590
DOI: 10.4319/lo.2007.52.2.0533
Source: Limnology and Oceanography [ISSN 0024-3590], v. 52, p. 533-546
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