Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/51655
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
Protein-Synthesis
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.
URI: http://hdl.handle.net/10553/51655
ISSN: 0024-3590
DOI: 10.4319/lo.2007.52.2.0533
Source: Limnology and Oceanography [ISSN 0024-3590], v. 52, p. 533-546
Appears in Collections:Artículos
Show full item record

SCOPUSTM   
Citations

86
checked on Jun 20, 2021

WEB OF SCIENCETM
Citations

84
checked on Jun 20, 2021

Page view(s)

30
checked on Jun 22, 2021

Google ScholarTM

Check

Altmetric


Share



Export metadata



Items in accedaCRIS are protected by copyright, with all rights reserved, unless otherwise indicated.