Table 49 
FOODS OF 28 MALLARDS FACM ESTUARINE BAY MARSHES+ 


Small seeda 68% (47-85) 
Olney Three-square 29 (13-9) 
Widgeongrass 25 (10-15) 
Twigrush 25 (10-L5) 
Saltgrass 1h ¢ b-33) 
Saltmarsh Cordgrass wh ¢ 4-33) 
Saltmarsh Bulrush 7 ( +-2h) 
Hightide-bush 7 ( +-2h) 
Softstem Bulrush 7 ( +-2h) 
Dotted Smartweed ho ¢ #19) 
Common Burreed 4 ( #19) 
Sago Pondweed  ( +-19) 
Largeseed Smartweed Lh ¢ +=19) 
Leaves, Stems and Rootstalks of 
Submerged Aquatic Plante 32% (15-53) 
Widgeongrasp 21 (¢ 8-2) 
Muskerass 11 ( 2-29) 
Leaves, Stems and Rootstalks of 
Submerged Aquatic Plants {Cont.) 
Sago Pondweed 
Pondweed 
Grain 
Corn 
Rootstalke of Energent 
Herbaceous Marsh Plants 
Undetermined Species 
Animal Food 
Volsella demissa (Pelecypode) 
Molevla sp. (Tunicata) 
Decapeda 
Amphipoda 
Chiridotea coeca (Isopeda) 
Fish 
4 ( 4-19) 
 ( +19) 
25% (10-5) 
25 (10-5) 
_L ¢ t-2h) 
7 ( +-2h) 
25 (10-45) 
12 ( 2429) 
h ( +-19) 
h ( +529) 
4 ( +19) 
h ( +419) 
4 ( #-19) 

1 twenty-one from brackish marshes and 5 from fresh marshes in Blackwater-Nanticoke section; 2 
from salt estuarine bay marshes in lower eastern shore section; collected during late fall and winter. 
Table 50 
FOODS OF 17 MALLARDS FROM PATUXENT RIVER BOTTOMLANDS* 
Mast 100% (80-100) Seeds (con't,) 
Beech 764 (50-9h) Grape 
White Oek 2h ¢ 650) Sweoatbay 
Oak & {( +-29) Leaves, Stems and Rootatalks 
of Submerged Aquatic Plants 
Seeds 59 (32-82) 
Kitelia 
Hornbeam hu? (22-73) 
Animal Food 
Sweetgum 22 { 1-37) 
Physa sp. (Gastropoda) 
Poison-1vy 6 ( +-29) 
Libelluloidea Nympha 
6% { +-29) 
6 ( +-29) 
18 ( 3 bh) 
18 ¢ hh) 
2h { 6-50) 
12 { 1-37) 
6  ( +29) 
+ Vicinity of Patuxent Wildlife Research Center; collected during fall and early winter. 
Percentage occurrence of foods that made up 54 or more of the volume in individual birds. Figures 
in parentheses show 95% confidence limits. 
118 
