1 38 NORTH AMERICAN FAUNA 76 



Table 10. Continued. 





Kilbuck 



Ahklun 



Sea cliffs 



Coastal 



Common namp 



Mountains 



Mountains 





plain 



Pine grosbeak 



U 









White-winged crossbill 



R 









Common redpoll 



A 



A 





A 



Hoary redpoll 









R 



* A - abundant; C - common; FC 



« fairly common; U - 



uncommon; R 



- rare; VR " very rare. 





tofairly-common breeding or suspected breeding birds at sea cliffs and 

 islands reflects the dominance of colonial seabirds and the low diversity 

 of nesting habitats there. 



Forty-five of 140 (32%) species that nested or were thought to nest 

 in our area were abundant-to-fairly-common and were more or less 

 widespread (both mountain ranges or entire area; Table 1 1). Another 

 18 (13%) species were widespread but were generally uncommon to 

 very rare. Twenty-four (36% of 67) of the uncommon-to-very-rare species 

 nested only in the Kilbuck Mountains, 3 (4%) were found mainly or 

 entirely in the Ahklun Mountains, and 22 (33%) were found only on the 

 coastal plain or on cliffs and islands (Table 4). These apparently re- 

 stricted distributions might in part result from our surveying very few 

 of the preferred nesting and foraging habitats; very restricted distribu- 

 tion of preferred habitats of the species (e.g., sea cliffs); preferred 

 habitats being man-made (e.g., mining tailings) and thus localized; or 

 combinations of two or more of those factors. 



Widespread and abundant-to-fairly-common breeding birds were 

 most frequently associated with shrub habitats, dwarf shrub mat habitats, 

 or freshwater habitats (Tables 12-19). These are ecologically widespread 



Table 11. Number of breeding or probably breeding birds by primary 



nesting area. 





Abundant to fairly 



Uncommon to very 



Primary nesting area 



common 



rare 



Kilbuck Mountains 



8 



24 



Ahklun Mountains 



4 



3 



Both mountain ranges 



14 



7 



Coastal areas 



16 



22 



Entire area 



31 



11 



Total 



73 



67 



