Assessment of bacterial dependence on marine primary production along a northern latitudinal gradient
Type | Article | ||||||||||||||||
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Date | 2018-10 | ||||||||||||||||
Language | English | ||||||||||||||||
Author(s) | Fouilland Eric1, Le Floc'h Emilie1, Brennan Debra2, Bell Elanor M.2, 3, Lordsmith Sian L.2, 4, McNeill Sharon2, Mitchell Elaine2, Brand Tim D.2, Garcia-Martin E. Elena5, Leakey Raymond J. G.2 | ||||||||||||||||
Affiliation(s) | 1 : MARBEC Univ Montpellier, CNRS, IFREMER, IRD, Av Jean Monnet, F-34200 Sete, France. 2 : Scottish Marine Inst, Scottish Assoc Marine Sci, Oban PA37 1QA, Argyll, Scotland. 3 : Australian Antarctic Div, 203 Channel Highway, Kingston, Tas 7050, Australia. 4 : Cardiff Univ, Sch Earth & Ocean Sci, 1-74B-3-01 Main Bldg,Pk Pl, Cardiff CF10 3AT, S Glam, Wales. 5 : Univ East Anglia, Sch Environm Sci, Ctr Ocean & Atmospher Sci, Norwich Res Pk, Norwich NR4 7TJ, Norfolk, England. |
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Source | Fems Microbiology Ecology (0168-6496) (Oxford Univ Press), 2018-10 , Vol. 94 , N. 10 , P. fiy150 (10p.) | ||||||||||||||||
DOI | 10.1093/femsec/fiy150 | ||||||||||||||||
WOS© Times Cited | 4 | ||||||||||||||||
Keyword(s) | carbon coupling, arctic waters, phytoplankton and bacteria interactions, nitrogen fluxes | ||||||||||||||||
Abstract | 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. |
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