Journal
AQUATIC MICROBIAL ECOLOGY
Volume 45, Issue 2, Pages 107-113Publisher
INTER-RESEARCH
DOI: 10.3354/ame045107
Keywords
flow cytometry sorting; cell metabolic activity; SAR11 clade; CARD-FISH; radioactive tracer labelling; Atlantic Ocean
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Low nucleic acid (LNA) bacterioplankton (sorted by flow cytometry) were characterised in surface water samples along a mericlional transect from 48 degrees N to 40 degrees S across the Atlantic Ocean. The LNA bacterioplankton abundance and metabolic activity, assessed by their S-35-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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