. Fig. 16. The average phosphate content of the o-ioo m. layer in 8o° W. the Antarctic surface water was very small, and even in November the main outburst had hardly started; the March observations were made after the peak concentration of phytoplankton in the far south. At the Antarctic convergence in 8o° W very little variation of phosphate content occurred in the o-ioo m. layer in the months of September, October and November, whilst farther south, October averages were higher than in November. We have no results for the critical period of early January to late February which would show th
. Fig. 16. The average phosphate content of the o-ioo m. layer in 8o° W. the Antarctic surface water was very small, and even in November the main outburst had hardly started; the March observations were made after the peak concentration of phytoplankton in the far south. At the Antarctic convergence in 8o° W very little variation of phosphate content occurred in the o-ioo m. layer in the months of September, October and November, whilst farther south, October averages were higher than in November. We have no results for the critical period of early January to late February which would show the effect of the peak concentrations near the convergence and at the ice-edge, and hence only a very approximate estimate of the consumption of phosphate can be made. The March observations were interesting because in the far south they show some effect of the peak concentration of phytoplankton which must have been present some little time previously. North of 64^° S, however, the March averages are seen to rise and attain the highest values recorded for any month in corresponding latitude, as far as about 590 S. This is at a time after peak conditions of phytoplankton concentration in
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