Mary, I., Heywood, J.L., Fuchs, B.M., Amann, R., Tarran, G.A., Burkill, P.H. and Zubkov, M.V.
SAR11 dominance among metabolically active low nucleic acid bacterioplankton in surface waters along an Atlantic Meridional Transect
Aquatic Microbial Ecology, 45, (2), .
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Low nucleic acid (LNA) bacterioplankton (sorted by flow cytometry) were characterised
in surface water samples along a meridional transect from 48°N to 40° S across the Atlantic Ocean.
The LNA bacterioplankton abundance and metabolic activity, assessed by their 35S-methionine
uptake rate, were similar along the transect, representing 36 ± 6 and 36 ± 11% of total bacterioplankton,
respectively. Fluorescence in situ hybridisation analysis of the flow-sorted cells revealed that the
LNA bacterioplankton population was dominated (59 ± 4%) by and contained virtually all the identifiable
SAR11 clade cells throughout the Atlantic Ocean. Therefore, the present study provides ecological
characterisation of this flow-sorted group and suggests both phylogenetic and functional constancy
of the LNA bacterioplankton at the basin-scale.
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