Table 47 
FOODS OF 13 MALLARDS FROM BRACKISH ESTUARINE BAYS ADJOINING AGRICULTURAL FIELDS? 


Seeds 69% (38-91) Grain 46% (19-75) 
Widgeongrass 46 (19-75) Corn 38 (13-69) 
Claspingleaf Pondweed 31 ( 9-62) Wheat 8 ( +-37) 
Dotted Smartweed 15 ( 1-6) Leaves, Stems and Rootstalks 
of Submerged Aquatic Plants 38 (13-69) 
Smartweed 8 ( +37) in 
Claspingleaf Pondweed 23. ( 5-5h) 
Largeseed Smartweed 8 ( +-37) 
Widgeongrass 8 ( +-37) 
Olney Three-square 8 ( +-37) 
Wildcelery 8 ( ++37) 
Hightide-bush 8 ( +-37) 
Eelgrass 8 ( +-37) 
Swamp Rose 8 ( +-37) 
Mollusks 8 ( +37) 
Holly 8 ( +-37) at 
Macoma balthica (Pelecypoda) 8 ( +=37) 

1 Seven from Chester River and Eastern Bay sections, 4 from Choptank River section, 1 from 
Susquehanna Flats section, 1 from upper western shore section; all collected during fall and win- 
ter. Percentage occurrence of foods that made up 5% or more of the volume in individual birds. 
Figures in parentheses show 95% confidence limits. 
Table 48 
FOODS OF 12 MALLARDS FROM ESTUARINE RIVER MARSHES* 


Seeds 100% (73100) Seeds (con't) 
Dotted Smartweed 58 ( 27-8) Walter Millet 8% ( +~39) 
Softstem Bulrush 2 ( 15+73) Swamp Dock 8 ( +=39) 
Common Three-square ha ( 15-73) Grassleaf Pondweed 8 ( +-39) 
Halberdleaf Tearthumb 33 ( 9-66) Big Cordgrass 8 ( +39) 
Arrow-arun 25 ( 5-58) Sedge (Carex lurida) 8 ( +-39) 
Common Burreed 17 ( 2-h9) Blackgum 8 ( +39) 
Giant Burreed 17 ( 2-9) Rootstalks of Emergent Marsh 
Plants 25 ( 5-58) 
Waomnyrtle 17 ( 2-h9) 
Bulrush 17. ( 2-9) 
Grape 17 ( 2-9) 
Undetermined Species 8 ( +=39) 
Olney Three-square 8 ( +-39) 
Saltmarsh Bulrush 8 ( +-39) 

1 Bleven from Patuxent River marsh, 1 from Elk River marsh; collected during early fall and spring. 
Percentage occurrence of foods that made up 5% or more of the volumenin individual birds. Figures 
in parentheses show 95% confidence limits. 
117 
