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Title: Temperature control of microbial respiration and growth efficiency in the mesopelagic zone of the South Atlantic and Indian Oceans
Authors: Mazuecos, Ignacio P.
Aristegui, Javier 
Vázquez-Domínguez, Evaristo
Ortega-Retuerta, Eva
Gasol, Josep M.
Reche, Isabel
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Mesopelagic zone
Microbial respiration
Prokaryotic growth efficiency
Indian Ocean, et al
Issue Date: 2015
Publisher: 0967-0637
Journal: Deep-Sea Research Part I: Oceanographic Research Papers 
Abstract: 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.
ISSN: 0967-0637
DOI: 10.1016/j.dsr.2014.10.014
Source: Deep-Sea Research Part I-Oceanographic Research Papers [ISSN 0967-0637], v. 95, p. 131-138
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