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Title

Depth Dependent Relationships between Temperature and Ocean Heterotrophic Prokaryotic Production

AuthorsLonborg, Ch. ; Cuevas, L. Antonio; Reinthaler, Thomas; Herndl, Gerhard J.; Gasol, Josep M. ; Morán, Xosé Anxelu G. ; Bates, Nicholas R.; Álvarez-Salgado, Xosé Antón
KeywordsProkaryotic production
Activation energy
Open ocean
Global warming
Arrhenius law
Issue Date2016
PublisherFrontiers Media
CitationFrontiers in Marine Science 3: 90 (2016)
AbstractMarine prokaryotes play a key role in cycling of organic matter and nutrients in the ocean. Using a unique dataset (>14,500 samples), we applied a space-for-time substitution analysis to assess the temperature dependence of prokaryotic heterotrophic production (PHP) in epi- (0–200 m), meso- (201–1000 m) and bathypelagic waters (1001–4000 m) of the global ocean. Here, we show that the temperature dependence of PHP is fundamentally different between these major oceanic depth layers, with an estimated ecosystem-level activation energy (Ea) of 36 ± 7 kJ mol−1 for the epipelagic, 72 ± 15 kJ mol−1 for the mesopelagic and 274 ± 65 kJ mol−1 for the bathypelagic realm. We suggest that the increasing temperature dependence with depth is related to the parallel vertical gradient in the proportion of recalcitrant organic compounds. These Ea predict an increased PHP of about 5, 12, and 55% in the epi-, meso-, and bathypelagic ocean, respectively, in response to a water temperature increase by 1°C. Hence, there is indication that a major thus far underestimated feedback mechanism exists between future bathypelagic ocean warming and heterotrophic prokaryotic activity
Description9 páginas, 2 figuras, 1 tabla.-- This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms
Publisher version (URL)https://doi.org/10.3389/fmars.2016.00090
URIhttp://hdl.handle.net/10261/142924
DOI10.3389/fmars.2016.00090
E-ISSN2296-7745
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(IIM) Artículos
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