Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/51636
Title: Prokaryotic carbon utilization in the dark ocean: Growth efficiency, leucine-to-carbon conversion factors, and their relation
Authors: Baltar, Federico
Aristegui, Javier 
Gasol, Josep M.
Herndl, Gerhard J.
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Prokaryotic growth efficiency
Leucine-to-carbon conversion factor
Deep ocean
Issue Date: 2010
Publisher: 0948-3055
Project: Remolinos Oceanicos y de Posición Atmosferica (Roda): Dinámica y Monitorización de Remolinos Oceanicos en la Corriente de Canarias 
Intercambio Plataforma-Oceano en El Ecosistema Marino de Las Islas Canarias-Peninsula Iberica (Caibex):Afloramiento de Cabo Guir 
Journal: Aquatic Microbial Ecology 
Abstract: Experiments were conducted in the mesopelagic subtropical northeast Atlantic Ocean to determine the range of variability in the prokaryotic leucine-to-carbon conversion factor (CF), and prokaryotic growth efficiency (PGE). The way prokaryotic heterotrophic production (PHP) is calculated directly influences PGE (variations of PGE between 1 and 31% were found for a single sample). The empirically obtained deep-water CFs showed a 7-fold variability (0.13 to 0.85 kg C mol–1 Leu), but were always lower than the theoretical CF of 1.55 kg C mol–1 Leu assuming no isotope dilution. Empirically determined CFs were highly correlated to PGE, suggesting that both parameters are representations of the same basic metabolic processes. Overall, the PGEs obtained in this study suggest that mesopelagic prokaryotic assemblages can sometimes be as important in carbon processing as their epipelagic counterparts
URI: http://hdl.handle.net/10553/51636
ISSN: 0948-3055
DOI: 10.3354/ame01422
Source: Aquatic Microbial Ecology [ISSN 0948-3055], v. 60 (3), p. 227-232
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