108 D. G. AINLEY AND G. A. SANGER 



Table 9. Diets of gulls in different localities fx = major prey, o = minor prey, and = incidental prey species). 



Glaucous gull (Larus hyperboreus) 



St. Lawrence Island (Fay and Cade 1959) x x x 



Chukchi Sea (Swartz 1966) x xx x xxxx 



Pribilof Islands (Preble and McAtee 1923) x x x x x 



Vancouver Island (Munro and Clemens 1931) x 



Glaucous-winged gull (L. glaucescens)* 



Pribilof Islands (Preble and McAtee 1923) x x x xxxx 



Alaska (Bent 1921) x 



No. Pacific (Sanger 1973) x 



Mandarte Island (Ward 1973) x x x x x 



Vancouver Island (Munro and Clemens 1931; x x x 



Robertson, unpublished data) 

 Western gull (L. occidentalis/ b 



Farallon I slands (PRBO, unpublished data) x x o r x xo oo x oo xooo 



Herring gull (L. argentatus) 



No. Atlantic (Zelikman 1961) x 



E. No. America (Bent 1946; Ainley, xxxxx xo 



personal observation) 



Vancouver Island (Munro and Clemens 1931) x x x 



Mew gull (L. canus) 



Alaska (Bent 1921) x x x 



Vancouver Island (Munro and Clemens 1931) x x 



Heermann's gull (L. heermanni) 



California (Bent 1921) x x x x 



Bonaparte's gull (L. Philadelphia) 



E. No. America (Bent 1921) x x x 



Black-legged kittiwake fRissa tridactylap 



Chukchi Sea (Swartz 1966) o ooxoox 



Pribilof Islands (Preble and McAtee 1923) ox o 



Alaska (Bent 1921) x o 



Cook Inlet d (Snarski, personal o o o x o x 



communication) 



No. Atlantic (Hartley and Fisher x 



1936; Zelikman 1961) 

 Red-legged kittiwake (R. brevirostris) 



Pribilof Islands (Preble and x x x 



McAtee 1923) 

 Sabine's gull (Xema sabini) 



Pt. Barrow (Banner 1954) x 



09 



"Other incidental prey were isopods in the North Pacific. 

 b Other incidental prey were the fish Merluccius at the Farallon Islands. 



Other incidental prey were isopods near the Pribilof s and in the Chukchi Sea, and amphipods in the latter area; Bent (1921) considered "crusta- 

 ceans" to be major prey. 

 d Study conducted during period of breeding failure. 



