Uptake rate of bioavailable phosphate in the North Atlantic Gyre (20.6˚ N)

Value 0.5 nmol l-1 h-1
Organism Bacterioplankton
Reference MV Zubkov et al., Dominant oceanic bacteria secure phosphate using a large extracellular buffer. Nature Communication 2015 6:7878. doi: 10.1038/ncomms8878. p.5 left column bottom paragraphPubMed ID26198420
Method An isotope dilution, concentration series bioassay
Comments P.5 left column bottom paragraph: "At 20.6° N the sum of the phosphate buffers of bacterioplankton cells was 14 times higher than the 2.3-nmol/ l of bioavailable ambient phosphate. At the same time, bacterioplankton continued to take up bioavailable phosphate at a rate of 0.5 nmol/l/h. A few degrees closer to the equator the bacterioplankton phosphate buffer approaches saturation, the demand for buffering phosphate is reduced and the rate of uptake of bioavailable phosphate by both SAR11 and Prochlorococcus cells drops by an order of magnitude, whilst their uptake rates of other molecules (methionine, ATP and CO2) remain high (Fig. 1)."
Entered by Nina
ID 113494