Table 66 
BIOGEOGRAPHICAL DISTRIBUTION OF GADWALLS DURING THE 1958-59 SEASON 
——<—£_—[—_£_£=_——_ —oV—_———{—{={KTX[_—=_=[=[=—S>~ICL=L—L[=—L=LL|LLL]™*=L=LLEEEErE~)~)y)Soan9nr———————— 

Oct.2-10, Nov.3-12, Dec.l~12, Jan.7-13, Mar.3-16, 

1958 1958 1956 1959 1959 
Cantral Potomac Section 0 97% 50% 76% 96% 
Coastal Section 0 + 37 8 8) 
Lower Eastern Shore Section 0 2 shh & 2 
Lower Potomac Section 0 0 a 11 1 
Blackwater-Nanticoke Saction 0 0 1 0 1 
Upper Potomac Section 0 0 0 o 1 
Eastern Bay Section 0 + 0 0 0 
Choptank River Section 0 0 + 0 ¢) 
Other Sections 0 0 0 o 0 
Total Populations 0 2,100 3,100 900 1,600 
Table 67 
FOODS OF 24 GADWALLS FROM BRACKISH ESTUARINE BAY MARSHES OF DORCHESTER COUNTY? 
Leaves, Stems and Rootstalks of Rootstalks of Emergent Marsh 
Submerged Aquatic Plants 88% (467-98)  Fiants _8% (1-26) 
Widgeongrass 67 (4-85) Saltgrass 8 (1+28) 
Eelzrass 17 «{ 438) Seeds 25. (9-h7) 
Muskerass 12 ¢ 233) Olney Three-square 8 {1-28} 
Claspingleaf Pondweed 8 ( 1-28) Widgeongrass B (1-28) 
Common Waterweed h { +-22) Saltmarsh Cordgrass 8 (1+28) 
Grassleaf Pondweed ho o( #=22) Claspingleaf Pondweed  {+*-22) 
Pimate Wetermilfoil 4 ( #22) Animal Food _y_ (4-22) 
Filamentous Green Algae (+422) Fish kk {*-22) 

1 Collected during late 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. 
132 
tur Lit umenesienhaiesall 
