Table 4. Means and 95 percent confidence limits for waterfowl (total Birds, Total Males, Observed Pairs, and Indicated Pairs) observed during 5 surveys of ponds in 5 different strata in the southern Yukon, May and June 1997 and 1998. Confidence limits are expressed as a percentage of the mean.
|
YEAR=1997 |
TOTAL BIRDS |
95% CL |
TOTAL MALES |
95% CL |
OBSERVED PAIRS |
95% CL |
INDICATED PAIRS |
95% CL |
|
Scaup sp. |
206 |
63 |
129.4 |
61 |
34.8 |
62 |
75 |
54 |
|
American Wigeon |
153.4 |
65 |
91.8 |
52 |
42.8 |
95 |
77.4 |
49 |
|
Mallard |
101 |
43 |
71.4 |
28 |
19.6 |
85 |
55.6 |
43 |
|
Barrow's Goldeneye |
87.8 |
42 |
56.6 |
31 |
27.4 |
63 |
53.4 |
26 |
|
American Green-winged Teal |
85.8 |
105 |
59.8 |
93 |
14 |
123 |
43.2 |
75 |
|
Ring-necked Duck |
69.6 |
62 |
49.8 |
64 |
10.4 |
94 |
27 |
96 |
|
Bufflehead |
58.2 |
25 |
34.8 |
17 |
19 |
46 |
34.8 |
17 |
|
Horned Grebe |
29.2 |
29 |
10.4 |
59 |
9.6 |
59 |
10.4 |
59 |
|
Northern Shoveler |
26.8 |
86 |
17.6 |
82 |
8.4 |
103 |
17.6 |
82 |
|
Northern Pintail |
22 |
76 |
16.2 |
68 |
4.8 |
101 |
15.6 |
68 |
|
Red-necked Grebe |
18.8 |
46 |
7.8 |
50 |
6.6 |
57 |
7.8 |
50 |
|
Surf Scoter |
11.2 |
149 |
6.8 |
148 |
0.6 |
185 |
1.6 |
179 |
|
Canvasback |
9.6 |
106 |
6.4 |
113 |
2 |
124 |
6.4 |
113 |
|
Canada Goose |
8.4 |
108 |
0.4 |
170 |
0.4 |
170 |
0.4 |
170 |
|
Pacific Loon |
6 |
98 |
2.2 |
101 |
2.2 |
101 |
2.2 |
101 |
|
White-winged Scoter |
4.6 |
134 |
2.2 |
180 |
0.6 |
185 |
1 |
215 |
|
Trumpeter Swan |
4.4 |
62 |
1.8 |
31 |
1.8 |
31 |
1.8 |
31 |
|
Oldsquaw |
3.2 |
237 |
2.4 |
250 |
0.2 |
278 |
0.2 |
278 |
|
Duck sp. |
3 |
176 |
0.2 |
278 |
0 |
0 |
0.2 |
278 |
|
Common Merganser |
2.4 |
135 |
1.4 |
134 |
0.6 |
113 |
1.4 |
134 |
|
Blue-winged Teal |
1.8 |
76 |
1.2 |
87 |
0.6 |
113 |
1.2 |
87 |
|
Ruddy Duck |
1.4 |
148 |
1.2 |
135 |
0.2 |
278 |
1.2 |
135 |
|
Red-breasted Merganser |
1.4 |
148 |
0.8 |
130 |
0.6 |
185 |
0.8 |
130 |
|
Common Goldeneye |
1.4 |
148 |
0.8 |
130 |
0.4 |
170 |
0.8 |
130 |
|
Tundra Swan |
0.8 |
278 |
0.2 |
278 |
0.2 |
278 |
0.2 |
278 |
|
Gadwall |
0.6 |
278 |
0.4 |
278 |
0 |
0 |
0.4 |
278 |
|
Redhead |
0.4 |
170 |
0.4 |
170 |
0 |
0 |
0.4 |
170 |
|
Common Loon |
0.4 |
170 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Swan sp. |
0.4 |
278 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Eurasian Wigeon |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Cinnamon Teal |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Dabbler sp. |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Harlequin Duck |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Greater White-fronted Goose |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Total Birds |
920 |
39 |
574.4 |
35 |
207.8 |
61 |
438 |
39 |
|
|
|
|
|
|
|
|
|
|
|
YEAR=1998 |
TOTAL BIRDS |
95% CL |
TOTAL MALES |
95% CL |
OBSERVED PAIRS |
95% CL |
INDICATED PAIRS |
95% CL |
|
American Green-winged Teal |
268.2 |
132 |
163.2 |
120 |
30 |
115 |
66.2 |
52 |
|
Scaup sp. |
217.6 |
67 |
139.6 |
68 |
45.8 |
40 |
84.6 |
46 |
|
American Wigeon |
196 |
73 |
113 |
68 |
57 |
43 |
80.6 |
29 |
|
Mallard |
150 |
34 |
108.4 |
27 |
28.4 |
72 |
84.2 |
25 |
|
Northern Shoveler |
132 |
57 |
80.2 |
58 |
33 |
51 |
54.2 |
59 |
|
Ring-necked Duck |
122.4 |
61 |
92.2 |
52 |
14.8 |
91 |
32.2 |
76 |
|
Barrow's Goldeneye |
118.6 |
75 |
62.2 |
42 |
32.8 |
61 |
54.8 |
36 |
|
Bufflehead |
73.2 |
36 |
42.6 |
28 |
25.6 |
50 |
40.4 |
27 |
|
Northern Pintail |
51 |
93 |
34.8 |
84 |
10.2 |
105 |
27.4 |
79 |
|
Horned Grebe |
29.2 |
45 |
12.4 |
54 |
12.2 |
51 |
12.4 |
54 |
|
Red-necked Grebe |
18.2 |
21 |
6 |
41 |
6 |
41 |
6 |
41 |
|
Canvasback |
16.4 |
175 |
9.4 |
180 |
5 |
159 |
6.6 |
162 |
|
Blue-winged Teal |
15.8 |
64 |
9.8 |
71 |
5.4 |
58 |
9.8 |
71 |
|
Trumpeter Swan |
6 |
106 |
2.2 |
151 |
2.2 |
151 |
2.2 |
151 |
|
Pacific Loon |
5.6 |
69 |
2.2 |
74 |
2.2 |
74 |
2.2 |
74 |
|
White-winged Scoter |
5.2 |
147 |
2.8 |
131 |
2.4 |
166 |
2.8 |
131 |
|
Canada Goose |
4.6 |
68 |
0.6 |
113 |
0.6 |
113 |
0.6 |
113 |
|
Surf Scoter |
2.2 |
220 |
1.2 |
224 |
1 |
215 |
1.2 |
224 |
|
Ruddy Duck |
2 |
124 |
1 |
124 |
1 |
124 |
1 |
124 |
|
Common Loon |
1.8 |
58 |
0.4 |
170 |
0.4 |
170 |
0.4 |
170 |
|
Duck sp. |
1.8 |
123 |
0.4 |
170 |
0.2 |
278 |
0.4 |
170 |
|
Red-breasted Merganser |
1.6 |
202 |
0.8 |
202 |
0.8 |
202 |
0.8 |
202 |
|
Common Merganser |
1.6 |
130 |
0.6 |
113 |
0.6 |
113 |
0.6 |
113 |
|
Common Goldeneye |
1.4 |
79 |
1 |
88 |
0.4 |
170 |
1 |
88 |
|
Redhead |
0.8 |
130 |
0.8 |
130 |
0 |
0 |
0.8 |
130 |
|
Eurasian Wigeon |
0.6 |
185 |
0.4 |
170 |
0.2 |
278 |
0.4 |
170 |
|
Tundra Swan |
0.4 |
278 |
0.2 |
278 |
0.2 |
278 |
0.2 |
278 |
|
Dabbler sp. |
0.4 |
278 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Cinnamon Teal |
0.2 |
278 |
0.2 |
278 |
0 |
0 |
0.2 |
278 |
|
Oldsquaw |
0.2 |
278 |
0.2 |
278 |
0 |
0 |
0.2 |
278 |
|
Harlequin Duck |
0.2 |
278 |
0.2 |
278 |
0 |
0 |
0.2 |
278 |
|
Gadwall |
0.2 |
278 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Greater White-fronted Goose |
0.2 |
278 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Swan sp. |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Total Birds |
1445.6 |
57 |
889 |
52 |
318.4 |
41 |
574.6 |
28 |