PACIFIC FLYWAY 
SOUTHERN ALBERTA - Continued 
Production Indices 
Table represents a summation of our aerial production data for 
1958. Another banner year is indicated for Alberta. The indices for 
preeding birds exceeded all other years and our index for broods has done 
likewise. While the success of the hatch was reduced somewhat by early 
eason drought in the prairies the phenomenal success of the hatch in the 
parklands more than offset this loss and gave an increase for the province 
as a whole. 
Table 7. Acrial Production Data - 1957 - 1958 
Strata A Strata B Strata C Province 
19571998 1957 9S 57 191957 «108 
Square Miles 22088 22088 = 26100 = 26100 ~=-16112 = 16112 ~=— 64300 64300 
Sample 
Square Miles 263.25 263.25 189.0 189.0 85.5 8505 537-15 537-75 

Total Broods 
Seen 1353 1218 1471 1925 U1 L& 2935 3191 
Broods Per 
Square Mile 5.14 4.63 e718 546 5.93 
Est. No. 
Broods 11.3532 102267 203058 265698 20781 9023 337379 376988 
Pot. Later 
10.18 1.29 0.56 

Broods 126 154 66 46 2h Lz 216 2u7 
Pot. Broods 
Per Sq. Mi. 0.48 0.58 0.35 0.24 0,28 0.55 0.40 O46 
No. Pot. 
Later Broods 10602 12811 135. 626 SL 8862 —aa48 27937 
Brood Index 124134 115078 212193 271962 25291 17885 361622 4ol9e5 
Ind. Broods 
Per Sq. Mi. 5.62 521 8.13 10.42 1.55 1.11 5.62 6.30 
Average 
Brood Size 6.21 6.02 6634 648 570 5231 6.25 6.30 
Est e No Py 
Young T0872 693920 1345304 1762314 144159 94969 2260335 2551203 
Percent 
Change « 10 31 ~ 3h 13 
29 
