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