YORK and KOZLOFF: NORTHERN FUR SEAL PUPS 



3 

 O 



o 



in 



O. 



a 



H— 



o 

 <u 



+-* 



50 r 1963 



40 



30 



20 



-125 + 29x 



/ 



X 



X 



X 



500 1000 1500 2000 



50r 1965 



1000 1500 2000 



500 1000 1500 2000 



500 1000 1500 2000 



50 r 1970 



40 



500 1000 



30 



20 



10 







» • 



/ 105 + 



/ 



46x 



X 



X 



50 r 1975 



40 



30 



20 



10 







500 1000 1500 

 Count of harem bulls 



-736 + 58x 



X 



J 



500 1000 1500 



Figure 2.— Relationship of estimates of northern fur seal pups born and counts of harem bulls for the various 

 rookeries of St. Paul Island, AK, during 1963-75 (data from Lander 1980). 



371 



