Table 92 
FOODS OF 20 WOOD DUCKS FROM ESTUARINE RIVER MARSHES} 


Seeds 100% (83-100) 
Arrow-arum 60 ( 36-81) 
Giant Burreed 30. ( 12-5h) 
Halberdleaf Tearthumb 15 ( 3+38) 
Swamp Rose 10 ¢ 1-31) 
Silky Dogwood 10 ( 1-31) 
Common Burreed 10 { 1-31) 
Wildrice 10 ( 1-31) 
Winterberry 5 ( +-25) 
Rosemallow 5 { +-25) 
Southern Smartweed 5 ( +-25) 
Smartweed 5 ( +25) 
Portdweed 5 ( +#=25) 
Sedge (Carex lurida) 5 { +25) 
Sedge (Carex lupulina) 5 ( +25) 
Rootstalks 5 ( +25) 
Undetermined species 5 { *%-25) 
Corn 5. € 25) 
1 Collected August 27-October 3 and March 7<April 5, 14 from Patuxent River 
Marsh, 3 from Elk River Marsh, 3 from Upper Potomac section. Percentage occur= 
rence of foods that made up 5% or more of the volume in individual birds. 
Figures in parentheses show 95% confidence limits. 
