Table 147 
FOODS OF 10 HOCDED MERGANSERS FROM VARIOUS HABITATS} 



Brackish Estuarine Fresh Estuarine River Interior 
Bay Marsh Bay BottomLands Impoundments 
2 Birds 3 Birds 3 Birds 2 Birda 
Fish 100%(15=100) 100%{ 29-100) 100%( 29-100} 100%(15-100) 
Centrarchidae (ap.?) &7 € 9-100} 100 (15-100) 
Johnny Derter 4 
(Etheostoma nigrum) 67 ( 9-100) 
American Eel 33 ( #- 91) 
(Anguilla rostrata) 
Ictaluridas (ap.?} 33 { t- 91) 
Cyprinidae (sp.7) 33 ( +- 91) 
Fundulus ap. (Foecilidae} SO ( 1- 99) 
Undetermined sp, 50 ( 1- 99) 1060 (29-100) 
Crustaceans 100 (15-100) 33 ( +- 91) 
Xanthidee 100 (15-100) 
Cambarus sp. (Decapoda) 33 ( ++ 91) 
Insect. Larvae and Nymphs 33 ( +~ 91) 100 (15=100) 
Libellvloidea 100 (15-100) 
Trichoptera 33 { #~ 91) 50 ( l- 99) 

1 Collected November-March. Percentage occurrence of foods that made up 5% or more of the volume 
in individual birds. Figures in parentheses show 95% confidence limita. 
Table 148 
ECOLOGLCAL DISTRIBUTION OF AMERICAN COOT POPULATIONS IN THE 
UPPER CHESAPEAKE REGION DURING THE 1955-59 SEASON 


Nove3-12, Decel-12, Jan.7-13, Mar.3-16, 
1958 1958 = =—s:1959 1959 
Fresh Sstuarine Bays Lhe 12% 2% 1% 
Slightly Srackish Estuarine Bays 10% Hh 4 17% ets 4 
Brackish Zatuarine Bays 0% 38% 78% Lig 
Salt Estuarine Bays +Z +% 32 0% 
Coastal Impoundment = Bay Complex ey 4 ey 4 Of OF 
Total Populations 17,000 18, 00 3,600 5,300 
205 
