DISPERSAL OF WHALES 359 



ment will be said to have ' dispersed '. It is naturally important to remember that a whale may have 

 done much travelling between the positions of marking and recovery. For example, if a whale, 

 marked in one summer season and recovered in another, has dispersed say 20 east or west, it has 



GO 



120 



ISO" 



W 180*E 



150° 



Fig. 1. Chart showing diagrammatically the distribution of marked whales and the 

 boundaries of the Antarctic whaling areas. 



probably in the meantime undertaken a long migration, possibly of 2000 miles to the north and back. 

 Even when a mark is recovered after a few weeks the whale may have wandered a long way from the 

 direct line from the position of marking to the position of recovery. 



