Table 144 
FOODS OF 11 RUDDY DUCKS FROM FRESH ESTUARINE BAYS 
OF THE GUNPOWDER AND POTOMAC RIVERS! 


Leaves, Stems and Rootstalks of 
Submerged Aquatic Plants 55% (23-8) 
Wildcelery 55 (23-84) 
Sago Pondweed 9 ( +12) 
Pondweed 9 ( +42) 
Seeds 18% ( 2-52) 
Widgeongrass 9 ( +«2) 
Grassleaf Pondweed 9 ( +-2) 
Corncockle 9 ( +2) 
Grain 27% ( 6-61) 
Wheat (bait) 27 ( 661) 
Animal Food 18% ( 2-52) 
Planorbis sp. (Gastropoda) 9 ( #-)2) 
Chironomidas larvae G9 ( +-2) 
1 Collected October-March. Percentage occurrence of foods that made up 5% 
or more of the volume in individual birds. Figures in parentheses show 954 
confidence lintts. 
202 
