296 



DISCOVERY REPORTS 



•119 



<?* 







•123 



,3^ 







WEDOELL SEA 

 175 ^ WATER 



«3 / 



133- / «?> 

 —127- 



JL2. 



Fig. 161. Distribution of phosphate values, averaged for the top 50 m., 

 in the South Shetlands survey, February 1929. 



y 



■8:10 



<f*° 



6 



•8 13 



^^ .R.rm 



6 M. 



•8 10 

 ,<z2 



•812 



•8ht 



«$ 805 

 i\j 8 00; 



800 

 809 

 "sfrll 



1 '-8-II / -B09 



JL 



Fig. 162. Distribution of pll values, averaged for the top 50 m., in the 

 South Shetlands survey, February 1929. 



of lowest phosphate value. We might expect the Euphausians to be in the area of 

 phytoplankton concentration most suited to them, i.e. where food is sufficient but not 

 too much to exclude them, thus not in the region of very high or very low phosphate 

 content; or from the opposite point of view we should also expect few Euphausians in 

 the area of lower phosphate content. Fig. 163 shows the distribution of Fin and Blue 

 whales. There were very few Blue whales, but the larger number of Fin whales were 

 found in the area of intermediate phosphate content. Kemp and Bennett (1932, pi. xl) 

 show the average distribution of Fin and Blue whales on the South Shetland grounds 

 based on all recorded positions of capture during the eight seasons 1922-3 to 1929-30. 

 Usually the greater number of whales are taken in a position to the south-west of the 

 concentration shown in Fig. 163. 



