Table 111 
FOODS OF 30 CANVASBACKS FROM FRESH ESTUARINE BAYS OF THE 
SUSQUEHANNA FLATS, AND GUNPOWDER AND SASSAFRAS RIVERS? 
Leaves, Stems and Rootstalka of 


Submerged Aquatic Plants 90% (73-98) 
Wildcelery 70 (50-86) 
Sago Pondweed 17 ( 5-35) 
Naiad 3 ( +-18) 
Rootstalks of Emergent Marsh Planta _3% ( ++18) 
Arrowhead 3 ( #18) 
Seeds Y7% (28-66) 
Sago Pondweed 20 ( 7-39) 
Claspingleaf Pondweed 20 ( 7-39) 
Pondweed 7 ( +23) 
Animal Food _3% ( +18) 
Ephemerioptera larvae 3. ( +18) 
+ Collected November-March. Percentage occurrence of foods that made up 5% 
or more of the volume in individual birds. Figures in parentheses show 95% 
confidence limits. 
170 
