PHOSPHATE, PLANKTON AND WHALE DISTRIBUTIONS 



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DECEMBER 1328 



c. 



FIN WHALES 



BLUE WHALES 

 Fig. 148. Fin and Blue whale distribution, December 1928 (from Kemp and Bennett, 1932). 



distribution does in fact bear a relation to the phytoplankton production over a little 

 time in the past is shown by charting the average pH values for the top 50 m., when it is 

 seen, in Fig. 147, that the higher pH values, those above 8-09, all occupy an area to the 

 south closely similar to that occupied by the lower phosphate values, those below 

 100 mg. per m. 3 A correlation graph of phosphate and pH values for this survey is 

 shown in Fig. 150. Atkins (1923&) has shown how pH values can be used as a measure 

 of phytoplankton production. We should now expect the Euphausians and so the 



JANUARY 1929 



WHALES 



BLUE WHALES 



Fig. 149. Fin and Blue whale distribution, January 1929 (from Kemp and Bennett, 1932). 



