| 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)." |