TABLE B-32. --Duck breeding populations, Montana, 1963 and 1964 
Sheridan 
County 
Hi- 
Line 
Great Falls- 
Piedmont 
Total 
Eastern 
Central 
Total area (sq. mi.)- 
1, 440 
7,926 
9,468 
7,020 
25, 
854 
Area sampled (sq. mi.)- 
38 
172 
94 
143 
447 
Ducks per sq. mi. : 
15 year average- 
27.0 
5.1 
10.7 
8.2 
9.1 
1963 - 
36.2 
6.9 
10.6 
3.9 
9.2 
1964 - 
32.8 
5.9 
11.8 
6.7 
9.7 
Population index: 
1963 -- 
52, 128 
54,689 
100,361 
27,378 
234, 
,556 
1964 - 
47, 232 
46,763 
111,722 
47,034 
252, 
,751 
Percent change, 1964 from 
1963- 
-9 
-14 
+11 
+72 
+8 
TABLE B-33. —May and July pond indexes by strata, (North Dakota, South Dakota, 
and Minnesota), 1959 to 1964 
[ Index numbers in thousands] 
Year 
Stratum 
East 
Central 
West 
Total 
May: 
1959 - 
162 
109 
41 
313 
I960 - 
223 
397 
52 
672 
1961- 
151 
105 
33 
289 
1962 - 
313 
348 
72 
732 
1963 - 
375 
413 
80 
868 
1964 - 
193 
207 
60 
460 
Average, 1959-64 - 
Percent change, 1964 from— 
236 
263 
56 
555 
1963 - 
-18.2 
-21.3 
+7.1 
-17. 1 
Average- 
-48. 5 
-49.9 
-25.0 
-47.0 
July: 
1959 - 
213 
110 
73 
396 
I960 - 
309 
311 
116 
736 
1961- 
166 
108 
77 
351 
1962 - 
281 
231 
68 
579 
1963 - 
245 
275 
99 
619 
1964 - 
154 
211 
70 
435 
Average, 1963-64 - 
Percent change, 1964 from— 
227 
239 
79 
544 
1963 - 
-32.2 
-11.7 
-11.4 
-20.0 
Average- 
-37.1 
-23.3 
-29.3 
-29.7 
Note:—Due to a change in recording water areas in 1962, 1962 July pond index is not comparable to 
previous counts. 
72 
