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Title

Active mesopelagic prokaryotes support high respiration in the subtropical northeast Atlantic Ocean

AuthorsArístegui, Javier; Duarte, Carlos M. ; Gasol, Josep M. ; Alonso-Sáez, Laura
Issue Date2005
PublisherAmerican Geophysical Union
CitationGeophysical Research Letters 32(3): 1-4 (2005)
AbstractHere we provide evidence, based on prokaryote metabolic proxies and direct estimates of oxygen consumption, that the mesopelagic prokaryote assemblage in the subtropical Northeast Atlantic is an active one. It supports a high respiration (0.22 ± 0.05 μmol O2 1-1 d-1, corresponding to 68 ± 8 mmol CO2 m-2 d-1), comparable to that of the epipelagic zone during the same period (64-97 mmol C m-2 d-1). Our findings suggest that mesopelagic prokaryotes in the NE subtropical Ocean, as well as in other eastern boundary regions, are important carbon sinks for organic matter advected from the highly productive coastal systems, and would play a key role in the global carbon cycle of the oceans. Copyright 2005 by the American Geophysical Union.
Publisher version (URL)http://dx.doi.org/10.1029/2004GL021863
URIhttp://hdl.handle.net/10261/88472
DOI10.1029/2004GL021863
Identifiersdoi: 10.1029/2004GL021863
issn: 0094-8276
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