TABLE B-9.—Lone drake index, southern Alberta, 
1955 to 1964 
[Expressed as percentage of total drakes 
Year 
Mallard 
Pintails 
Canvasback 
1955- 
77.30 
81. 16 
67.37 
1956--- 
84. 60 
85.09 
63.12 
1957- 
92. 03 
88.82 
81. 60 
1958- 
85.80 
84.34 
75.47 
1959- 
70. 66 
73.26 
42.84 
I960- 
84.92 
82.02 
72.04 
1961- 
77. 10 
74.22 
63. 89 
1962- 
82.39 
83.98 
54.32 
1963- 
85.44 
85.44 
81.27 
1964- 
74. 94 
88.28 
51. 10 
TABLE B-10. —Waterfowl brood and late-nesting indexes, by stratum, compared with previous 
year and long-term averages, southern Alberta, July, 1963 and 1964 
[Index numbers in thousands] 
Species 
For stratum- 
- 
Total 
Average 
1956 
1964 
Percent change 
from— 
A 
B 
C 
1963 
1964 
1963 
Average 
Broods: 
Duck brood index- 
33 
142 
14 
202 
189 
234 
-6 
-19 
Average brood size 1 - 
6.1 
6.3 
5.6 
6.2 
6.2 
5.9 
No count 
+5 
Coot brood index- 
1 
17 
Trace 
19 
18 
47 
-5 
-62 
2 
Late nesting index- 
Dabblers: 
Mallard- 
1 
Trace 
2 
2 
3 
4 
Gadwall- 
1 
— 
Trace 
2 
1 
2 
American widgeon- 
— 
— 
1 
Trace 
1 
.5 
Green-winged teal- 
Trace 
— 
— 
— 
— 
Trace 
Blue-winged teal- 
Trace 
— 
Trace 
Trace 
Trace 
1 
Shoveler- 
1 
Trace 
1 
1 
2 
1 
Pintail- 
Trace 
— 
Trace 
Trace 
Trace 
.5 
Subtotal - 
3 
Trace 
4 
5 
7 
9 
+40 
-22 
Divers: 
Redhead - 
— 
— 
Trace 
— 
Trace 
Trace 
Canvasback- 
— 
— 
— 
— 
_ 
Trace 
Scaup- 
1 
1 
1 
1 
3 
7 
Ring-necked duck- 
— 
— 
_ 
_ 
_ 
Trace 
Goldeneye- 
— 
— 
— 
— 
— 
Trace 
Bufflehead- 
— 
— 
— 
— 
_ 
Trace 
Ruddy duck- 
Trace 
1 
Trace 
2 
1 
3 
Subtotal- 
1 
2 
1 
3 
4 
10 
+33 
-60 
Total- 
4 
2 
5 
8 
11 
19 
+37 
+42 
^Class II and m broods only. 
2 
As indicated by adult pairs and singles. 
58 
