Breeding Popuiation Indices 
Table 1 = 1957 Waterfowl Population Indices 
Pm 
Eastern Central Western Total 

Sq.Mi. in Study Area 
Stratum A 3,859 2,824 4,186 x 
Stratum B 734 1,815 2,814 B 
Obsezved ducks per sq.mi. 
Stratum A | 8.4 10.9 13.2 © - 
Stratum B 0.0 Bae ** e 
Aerial Index** 32,299 ~—~36,569 55,297. . 124,165 
Percent Non-breeders 345 3.4 6.6 - 
Breeding Ducks (Aerial Index 
less Non-breeders) 31,182 35,340 51, 648 = 
Percent Lome Males 12.9 30.7 41.9 - 
Correction for Nesting Hens 4,013 10, 829 21,788 a 
Corrected Breeding Duck 
Index 55: 195 46,169 73,436 154, 800 

* Due to inclement weather, no counts could be made in the western 
Stratum B. . 
** Ducks per square mile x square miles in the study area. 
Table 24 = Waterfowl Breeding Population Trends 


LOST Aer tal lt Te ite lens advealstecets serene Ley LO 
1956 aevial index cacescvcsscevees 123, 639%...- Change to 1957....none 
Average, 1954-56 aevial indices...123,324,.... change to 1957....+ 1% 
1957 corrected breeding duck 
LIAS, locos wha naavecalh olga: ove ee al are ol eve tecal Dey OULU 
1956 corrected breeding duck 
PGE, wry ok eos weerele a Siyp bce outers selene) 94 949s as. oe Change to8l957. 5... +63% 
Average, 1954-56 breeding 
duck indices. ..2.seeecccceccceecll9, 255.4... change to 1957... - +30% 
ee 

64 
