106 D. G. AINLEY AND G. A. SANGER 



Table 7. Diets of loons and grebes in different localities (x = major prey, o = minor prey, and = incidental prey species). 



CRUSTACEAN FISH 



Common loon IGavia immerl 



Alaska (Palmer 1962) o o 



Vancouver Island (Munro and Clemens 1931) x 



Denmark (Madsen 1957) o x 



Yellow-billed loon tG. adcimsiil" 



Alaska (Cottam and Knappen 1939) o 



Alaska (Bailey 1922) 

 Arctic loon (G. arcticafi 



Vancouver Island (Palmer 1962) x 



Vancouver Island (Robertson, unpublished data) x 



California (Palmer 1962) 



Denmark (Madsen 1917) o x x 



Red-throated loon (G. stellatafi 



Oregon (Palmer 1962) 



No. Atlantic (Palmer 1962) x 



Denmark (Madsen 1957) o x o 



Western grebe lAechmophorus occidentalis) 



Vancouver Island (Munro 1941) o x 



Vancouver Island (Robertson, unpublished data) x 



Puget Sound (Phillips and Carter 1957) x 



Washington (Chatwin 1956) x 



California (Palmer 1962) o x x 



Red-necked grebe /Podiceps grisegenaj 



Pribilof Islands (Preble and McAtee 1923) o 



Vancouver Island (Wetmore 1924) x 



Vancouver Island (Munro 1941) x o x 



E. No. America (Wetmore 1924) o o o 



Horned grebe (P. auritusfl 



Pribilof Islands (Preble and McAtee 1923) x o 



W. No. America (Wetmore 1924) x x o 



Vancouver Island (Munro 1941) x x 



Denmark (Madsen 1957) o o o 



Eared grebe IP. nigricollisp 



W. No. America (Wetmore 1924) x 



Vancouver Island (Munro 1941) x x o 



Denmark (Madsen 1957) x 



8 Other incidental prey were copepods and isopods. 



b Other incidental prey were pholids in Denmark. 



c Other incidental prey were copepods and cephalopods in North Atlantic areas. 



d Other incidental prey were isopods in western North America and fish eggs near Vancouver Island. 



e Other incidental prey were fish eggs in Denmark. 



