Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/51628
Título: Temperature control of microbial respiration and growth efficiency in the mesopelagic zone of the South Atlantic and Indian Oceans
Autores/as: Mazuecos, Ignacio P.
Aristegui, Javier 
Vázquez-Domínguez, Evaristo
Ortega-Retuerta, Eva
Gasol, Josep M.
Reche, Isabel
Clasificación UNESCO: 251001 Oceanografía biológica
Palabras clave: Mesopelagic zone
Microbial respiration
Prokaryotic growth efficiency
Temperature
Indian Ocean, et al.
Fecha de publicación: 2015
Editor/a: 0967-0637
Publicación seriada: Deep-Sea Research Part I: Oceanographic Research Papers 
Resumen: We have measured both prokaryotic heterotrophic production (PHP) and respiration (R), then providing direct estimates of prokaryotic growth efficiencies (PGE), in the upper mesopelagic zone (300–600 m) of the South Atlantic and Indian Oceans. Our results show that in situ R ranged 3-fold, from 87 to 238 μmol C m−3 d−1. In situ PHP rates were much lower but also more variable than R (ranging from 0.3 to 9.1 μmol C m−3 d−1). The derived in situ PGE values were on average ~1.4% (from 0.3% to 3.7%), indicating that most of the organic substrates incorporated by prokaryotes were respired instead of being used for growth. Together with the few previous studies on PGE published before for the Atlantic Ocean and Mediterranean Sea, our findings support the hypothesis that the global mesopelagic zone represents a key remineralization site for export production in the open ocean. We also found a strong correlation between R and PGE with temperature across a gradient ranging from 8.7 to 14.9 °C. The derived Q10 value of 3.7 suggests that temperature variability in the mesopelagic zone plays a significant role in the remineralization of organic matter.
URI: http://hdl.handle.net/10553/51628
ISSN: 0967-0637
DOI: 10.1016/j.dsr.2014.10.014
Fuente: Deep-Sea Research Part I-Oceanographic Research Papers [ISSN 0967-0637], v. 95, p. 131-138
Colección:Artículos
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