Assessment of bacterial dependence on marine primary production along a northern latitudinal gradient

Fouilland, Eric, Le Floc'h, Emilie, Brennan, Debra, Bell, Elanor M., Lordsmith, Sian L., McNeill, Sharon, Mitchell, Elaine, Brand, Tim D., García-Martín, E. Elena and Leakey, Raymond J. G. (2018) Assessment of bacterial dependence on marine primary production along a northern latitudinal gradient. FEMS Microbiology Ecology, 94 (10). ISSN 0168-6496

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Recent observations in polar marine waters have shown that a large fraction of primary production may be lost to respiration by planktonic bacteria due to very low bacterial growth efficiencies in cold waters. Here we report that sea temperature may be a key factor influencing the interaction between bacteria and primary production in North Atlantic and Arctic waters, suggesting that low primary production rates could not sustain bacterial carbon demand in the coldest Arctic waters. The use of freshly produced phytoplankton exudate by bacteria in early- and mid-summer was assessed, together with the bacterial uptake of dissolved inorganic nitrogen (DIN = nitrate and ammonium), in surface waters along a latitudinal gradient from the North Sea to the Arctic sea ice. Bacterial production was independent of the low primary production measured in the coldest waters. Under these conditions, heterotrophic bacteria can consume a large fraction of DIN and N-rich organic matter, making them strong contributors to N fluxes in these waters.

Item Type: Article
Uncontrolled Keywords: carbon coupling,arctic waters,phytoplankton and bacteria interactions,nitrogen fluxes,sdg 14 - life below water ,/dk/atira/pure/sustainabledevelopmentgoals/life_below_water
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: LivePure Connector
Date Deposited: 14 Aug 2018 11:31
Last Modified: 21 Oct 2022 19:35
DOI: 10.1093/femsec/fiy150


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