2024-03-29T05:02:05Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1429242020-11-23T10:45:46Zcom_10261_123com_10261_8com_10261_47col_10261_376col_10261_300
00925njm 22002777a 4500
dc
Lonborg, Ch.
author
Cuevas, L. Antonio
author
Reinthaler, Thomas
author
Herndl, Gerhard J.
author
Gasol, Josep M.
author
Morán, Xosé Anxelu G.
author
Bates, Nicholas R.
author
Álvarez-Salgado, Xosé Antón
author
2016
Marine 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
Frontiers in Marine Science 3: 90 (2016)
http://hdl.handle.net/10261/142924
10.3389/fmars.2016.00090
2296-7745
Prokaryotic production
Activation energy
Open ocean
Global warming
Arrhenius law
Depth Dependent Relationships between Temperature and Ocean Heterotrophic Prokaryotic Production