SURFACE AND DIVING BIRDS 



Nesting' 



Food Habits 



References 



Fish, crabs, mollusks Narcisse, pers. co 



Fish, aquatic insects, Ogden 1969 

 mollusks 



Crayfish, fish, 

 mollusks 



Widgeon grass 



Mollusks, crusta- 

 ceans, widgeon grass 



Polygonum , snails, 

 Ruppia 



Ruppia , Zostera , 

 mollusks 



Saggitaria , mollusks, 

 Cyperus 



Ruppia , Zostera .- 

 aquatic insects 



Cyperus , snails, 

 insects, crustaceans 



Ruppia , Zostera , 

 mollusks 



mollusks, aquatic 

 insects, Ruppia , 

 Zostera 



Nuts, seeds 



Narcisse, pare, coram. 



Narcisse, pers. conm. 



Ffrench 1966 

 Bacon 1970 



Kushlan & White 1977a 



Ffrench 1966 



Ogden 1969 

 Smith, pers. obs . 



Ogden 1969 



Kushlan et al., in prep. 



Ogden 1969 



LaHunt & Cornwell 1970 

 Kushlan et al., in prep. 



Ogden 1969 



Narcisse, pers. comm. 

 Kushlan et al.,in prep. 



Narcisse, pers. comm. 



Kushlan et al., in prep. 



Narcisse, pers. coram. 

 Ffrench 1966 



Narcisse, pers. comm. 



Kushlan et al. , in prep. 



Narcisse, pers. comm. 



Ogden 1959 



Snails, clams, aquatic Ogden 1969 



insects, Ruppia , Zos- 



tera 



Ring-necked Duck Abundant 



( Aythya collar is ) 



Polygonum , Ru ppia , 

 crayfish, snails 



Ogden 1969 



Kushlan et al., in prep. 



Canvasback Uncommon 



( Aythya valiaineria ) 



Vallisneria , Ruppia , 

 Zostera 



Ogden 1969 



Kushlan et al., in prep. 



134 



