TABLE B-57.--Duck production ratios, Chippewa National Forest, 
Minnesota, 1963 and 1964 
Species 
1963 
1964 
Adults 
Juveniles 
Ratio 
Adults 
Juveniles 
Ratio 
Mallard- 
373 
730 
1:1. 9 
524 
643 
1:1.2 
American widgeon- 
53 
127 
1:2.3 
123 
158 
1:1.3 
Blue-winged teal- 
39 
186 
1:4.7 
58 
147 
1:2. 5 
Wood duck- 
65 
204 
1:3.1 
108 
185 
1:1.7 
Ring-necked duck- 
8 
30 
1:3.7 
26 
47 
1:1.8 
Goldeneye - 
32 
214 
1:6.7 
95 
281 
1:2.9 
Other- 
25 
39 
1:5.0 
3 
29 
1:9.6 
Total- 
595 
1,530 
1:2.5 
937 
1,490 
1:1.6 
TABLE B-58.--Duck breeding population index, Michigan, 1963 and 1964 
Potential breeders 
per lineal mile 
Year 
Lineal miles 
censused 
Wood duck 
All species 
1963- 
!964- 
128.5 
137.4 
2.03 1 
1.60 
20.10 
17.09 
"^Lineal miles for wood duck was 137.4 
TABLE B-59.--Duck production index, Michigan, 1963 and 1964 
Year 
Number per lineal mile 
Average brood size 
Broods 
Hens and young 
Lone drakes 
1951- 
0.35 
2.20 
3.31 
5.76 
1952 - 
.70 
3.92 
3.21 
4. 60 
1953 - 
.51 
3.63 
4.32 
6.10 
1954 - 
.20 
1.67 
4. 60 
6.24 
1955 - 
.64 
4.65 
5.09 
6.28 
1956 - 
.53 
3. 67 
4.40 
5.86 
1957 - 
..38 
2.30 
4.80 
5.10 
1958 - 
.31 
2.18 
6. 50 
5.97 
1959 - 
.66 
4. 00 
12.58 
5. 06 
I960 - 
.33 
2.48 
14.49 
6. 50 
1961- 
.67 
3.80 
7.71 
5. 64 
1962 - 
.87 
5.64 
8.48 
5.60 
1963 - 
1.08 
6.82 
6.06 
5. 33 
1964 - 
.80 
5. 83 
8.77 
5.76 
1 
Average wood duck brood size was 
6.5 
86 
