Table 60 
FOODS OF 13 BLACK DUCKS FROM SALT ESTUARINE BAY MARSHES OF LOWER EASTERN SHORE SECTION? 


Animal Food TTé (35-93) Seeds 38% (13-69) 
Fish (chiefly Poecilidae) 5h (25-81) Widgeongrass 31 ( 9-62) 
Melampus bidentatus (Gastropoda) 15 ( 1-6) Saltgrass 8 ( +-37) 
Bittium varium (Gastropoda) 15 ( 1-6) Saltmarsh Bulrush 8 ( +-37) 
Amphipoda 15 ( 1-6) Hightide-bush 8 ( ++37) 
Decapoda 8 ( +37) Needlerush 8 ( +37) 
Libelluloidea nymphs 8 ( +=37) Twigrush. 8 ( +-37) 
Heteroptera nymphs 8 ( +37) Leaves, Stems and Rootstalks of 
Submerged Aquatic Plants 23 ( 5-5h) 
Corixidae 8 ( +-37) 
Widgeongrass 23. ( 5-5h) 
Coleoptera 8 ( +37) 
Grain 15 ( 1-46) 
Corn 15 ( 1-6) 

1 Collected during fall and winter. Percentage occurrence of foods that made up 5% or more of the 
volume in individual birds. Figures in parentheses show 95% confidence limits. 
Table 61 
FOODS OF 6 BLACK DUCKS FROM COASTAL SALT MARSHES? 

Animal Food 100%( 54-100) Seeds (con't) 
Melampus bidentatus (Gastropoda) 67 (22-96) Twigrush 17% (+-65) 
Volsella demissa (Pelecypoda) 33 ( h-78) Saltgrass 17. ( +~65) 
Fish 17 ( +65) Bayberry 17 ( +#65) 
Amphipoda 17 ( +-65) Leaves, Stems and Rootstalks 
of Submerged Aquatic Plants 17 ( +65) 
Coleoptera 17 ( +-65) pe 
Sea-lettuce 17 ( +65) 
Seeds 33 ( 4-78) 
Widgeongrass 33 ( 4-78) 
Saltmarsh Cordgrass 17 ( +-65) 

1 Collected during late fall, winter 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. 
127 
