Table 62 
FOODS OF 15 BLACK DUCKS FROM ESTUARINE RIVER MARSHES OF PATUXENT, NANTICOKE, AND ELK RIVERS? 


Seeds 93%( 68-100) Seeds (conti) 
Dotted Smartweed 60 (32 -8) Blackberry 7 ( +-32) 
Halberdleaf Tearthumb 27 ( 7 =56) Smartweed 7 ( +=32) 
Pickerelweed 20 (  -l9) Bulrush 7 ( +-32) 
Arrowleaf Tearthumb 13 (1 -)2) Leaves, Stems and Rootstalks 
of Submerged Aquatic Plants Th( +~32) 
Wildrice 13 (1 -)2) mais 
Coontail T ( ++32) 
Common Burreed 13 ( 1 -h1) 
Common Waterweed 7 ( +-32) 
Giant Burreed 13 (1 =-h1) 
Leaves of Emergent Marsh Plants 7_( +32) 
Arrow-arum 13 ( 1-1) a 
Grass 7 ( +32) 
Common Three-square 7 ( + -32) 
Aninal Food 20 ( k-hg) 
Olney Three-square 7 ( + -32) 
Libelluloidea nymphs 7 ( +32) 
Buttonbush 7 ( + ~32) 
Gammaridae 7 ( +-32) 
Rosemal low 7 ( + -32) 
Rissoidae 7 ( #-32) 
Winterberry 7 ( +32) 
Gastropoda (sp.?) 7 ( 4-32) 
Panicum 7 ( + ~32) 
1 Collected during early fall and early spring. Percentage occurrence of foods that made up 5% or 
more of the volume in individual birds. Figures in parentheses show 95% confidence limits. 
128 
