TABLE E-21.--Waterfowl breeding populations, by species, North Dakota, 1948-61 
[Index numbers] 



Species 1961 | Pereent change from: | Pereent change from: sia Percent species 
Ducks ; 
Dabblers: 
Pintail----- a —~ daft 
Mallard------~=----------- ae 
American widgeon-----~--- ae 
Shove ler--------<------+-- oa 
Gadwall------------------ See 
Blue-winged teal-------.- bbe 
Green-winged teal Bs 
Subtotal-------~-------- eS 
Divers: 
3.7 
2.1 
3.5 
8 

? 
3 
: 10.1 
600 2,400 +120 +277 2 
1,042,100 902,700 993,300 100.0 
147,700 181,600 110,900 
1 The 1955 index for scaup omitted; considered erroneous due to delayed departure of migrating scaup from State 
that year. 




TABLE E-22.--Ratios of lone to paired drakes during breeding population surveys, North Dakota, 1956-61 
Blue-winged teal 




199:100 125:100 





1957-+---- +2 ------- - 259:100 172:100 55:100 
1958--------- ennecee 161:100 129: 100 44: 100 
1959---------+----== 218:100 121: 100 552100 
1960--=------ meccnon- 294:100 169100 61:100 

Rie rt at 193:100 93:100 
1 May be due to sampling error. 
95 
