JUAN FERNANDEZ, WHITE-NECKED PETRELS 



Spring Summer 



Totals 



17,568 



Fall 



Winter 



63,504 



97,056 



11,448 



BLACK-WINGED PETREL 

 Spring 



Summer 



Fall 



Winter 



Totals 



4,500 



16,920 



62,316 



1,044 



BULWER'S PETREL 



Spring 



Totals 



36,000 



Summer 



Fall 



Winter 



32,544 



2,736 



432 



Figure 29. — Sea bird abundance in subareas in the study area. The squares of the table repeat the 

 geographical layout of figure 28. The upper figure in each square is the density in birds per 10 

 linear miles (18.5 km.) of observation; the lower figure is the estimated population, weighted by 

 the effective range of observation of each species. Density and population figures are daily 

 averages during each season. — Continued. 



75 



