Table 91 
FOODS OF 57 WOOD DUCKS FROM PATUXENT RIVER BOTTOMLANDS?+ 


Nov. - Dec, 

Sept. = Oct. Other Years 
17 binds b Birds ¢ Hote See oe 
Mast 88% (63-99) 100% (39-100) 14% (+-58) 100% (83-100) 88%(7-100) 
Beech 12 ( 1-37) 1h (+-58) 90 (69- 99) 50 (15-85) 
White Oak 76 (50-9) 19 ( 5- he) 
Pin Oak 100 (39-100) 50 (15-85) 
Willow Oak 13 ( +-53) 
Fruits and Seeds _lWi% (18-68) _O 100% (59-100) _38% (18-62) 50% (15-85) 
Halberdleaf Tearthumb 100 (59-100) 13 ( +-53) 
Hornbeam 12 ( 1-37) 1h ( +-58) 2h ( 8-48) 
Blackgum 2h ( 6-50) 
Sweetgum Uh ( 3-37) 13 (+-53) 
Common Burreed 6 ( #-29) 1h ( 3-37) 
Grape 6 ( +-29) 5 ( +-2h) 
Winterberry 1h ( +-58) 
Poison-ivy 13 ( +53) 
Sedge (Carex folliculata) 13. ( ++53) 
Sedge (Carex intumescens) 13 ( +-53) 
eng ir 4i% (18-68) _O 57% (18-91) ibe (3-37) _O| 
Ribbonleaf Pondweed 35 (1h-62) 10 (1-31) 
Nuttall Waterweed 57 (18-91) 
Nitella 6 ( +#-29) 5 (+-2h) 
Spirogyra 6 ( +-29) 
Animal Food 56. Ss. a. SS. 13% (+-53) 
Araneida 13 (+-53) 

1 within or near the Patuxent Wildlife Research Center. Percentage occurrence of foods that made 
up 5% or more of the volume in individual birds. Figures in parentheses show 95% confidence limits. 
152 
