Bald eagle/osprey nesting success in the national forests of the eastern region : ... annual report / United States Department of Agriculture, Forest Service, Eastern Region.

Historic, Archive Document

Do not assume content reflects current
scientific knowledge, policies, or practices.

\

^T—

aQL696

United States
Department
of Agriculture

Forest Service

Eastern Region
Milwaukee, Wl

in the National Forests
of the Eastern Region

—mi—

9

D

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

FORWARD

This 25th Annual Report on the status of
the Eastern Region's Bald Eagles and
Opsreys is a significant step in the
long-term monitoring of population and
success trends of these species on the
National Forests. We are pleased to report
that populations of both species continue
to increase.

This survey is part of a continuing
multi-agency effort to follow and better
understand relationships between wildlife
habitat and other environmental
influences. These surveys are expected to
continue not only to provide consistent
trend information, but also to demonstrate
that this kind of monitoring is
practicable. We are confident that these
efforts will improve communication,
strengthen our information base and clarify
options for integrating the management of

faring for

the Land

and \erving

People l

I

I

I

H

I

I

I

0

n

n

D

i

i

o

0

1

n

i

D

BALD EAGLE-OSPREY NESTING SEASON REPORT

USDA-FOREST SERVICE - EASTERN REGION
1987

This is the 25th consecutive year that the National Forests of the Eastern
Region have monitored the breeding activities of the bald eagle and the
osprey. Aerial surveys to determine breeding activity at nest sites,
called occupancy surveys, were conducted in April and May. Nests where
breeding activity was observed, called productivity surveys, were visited
again close to fledging time in July to count the number of young eagles
and ospreys .

Survey methods for the years 1974 through 1984 were consistent from one
year to the next. This provided monitoring information that was consistent
between each of those 11 years. In 1985, the survey performance was
interrupted when the Superior National Forest suspended most survey
activities in the Boundary Waters Canoe Area Wilderness (BWCAW) . During
1986 and 1987, the Superior NF conducted the occupancy survey for eagles in
the BWCAW as before, but attempted the productivity survey by ground
reconnaissance only. Not all occupied areas could be checked for
productivity. Survey performance on the other six Forests that have
populations of these birds remained uniform for the past 14 years.

Monitoring nests and finding new ones in the BWCAW continues to be a
problem. It is time-consuming and labor intensive. The Superior plans to
initiate a college course in conjunction with Northwoods Audubon in 1988
that would provide additional help in monitoring the nests within the
wilderness. A reward system was also initiated by the Superior in 1986 to
encourage individuals to report new nests. A bald eagle print and a letter
of appreciation from the Forest Supervisor is given each person that
reports a new eagle or osprey nest. Thirty new nests have been added to
that Forest's inventory by the reward system.

BALD EAGLE

The number of nests examined on the National Forests has increased from 451
in 1986 to 516 in 1987. The number of breeding areas on the Forests'
inventories has increased steadily from 166 in 1969 to 391 in 1987.

The productivity surveys in 1987 found 28l nests occupied by adult eagles.
This is an increase of 37 eagle pairs over last year's total of 244 pairs.
This year the Region is within 66% of its objective to have 427 breeding
eagle pairs by the year 2020. The number of young produced was 315 this
year which is an increase of 5 2 from last year's total of 263 young. The
Ottawa NF was the only forest that reported a reduction in occupied nests.
All of the other reporting forests showed an increase, with the Chippewa NF
having the most significant increase.

- 1 -

The Chippewa NF reported 135 pairs of breeding adults. This is significant
because that Forest’s objective is to have 150 breeding pairs by the year
2020.

In some areas of the Chippewa Forest, the eagle breeding population may be
approaching a "saturation" point. Eagle pairs for the first time have
established nest sites in unusual areas, such as along roads and near
dwellings. Several eagles also successfully utilized osprey nests. These
unusual activities may be an indication that young breeding adults may be
experiencing difficulty in finding optimum habitat for nesting.

Bald eagles are now being reported during the breeding season on other
National Forests in the Eastern Region. The Mark Twain NF in Missouri
reported a successful eagle nest near their boundary that produced at least
one young and possibly a second. Two pairs continue to nest within the
proclamation boundary of the Shawnee NF in Illinois. The two nests are
located within the Crab Orchard National Wildlife Refuge in southern
Illinois. One of the two nests produced two eaglets. A new nest was
discovered on the Monogahela NF this year. An adult eagle was observed
constructing this nest, however, there was no breeding attempt made. The
Allegheny NF in Pennsylvania has had sightings of two adults accompanied by
an immature bird on various occasions on the Allegheny Reservior during the
nesting season.

The Indiana Department of Natural Resources hacked 20 young eagles on the
Hoosier NF in 1987 . The hacking project was initiated in 1985 as a
cooperative effort between the Forest Service and the Indiana DNR. The
hacking site is located on the Monroe Reservoir where three young eagles
were released in 1985 and seven young in 1986.

OSPREY

The number of occupied osprey nests within the Region continues to increase
each year since the survey was initiated in 1965. In 1987, 252 occupied
nests were observed of which 157 nests were successful in producing 222
young.

The productivity surveys in 1987 found 252 nests occupied by breeding
ospreys. This is an increase of 20 osprey breeding pairs from 1986's total
of 232 pairs. The 222 young produced is an increase of 37 from last year's
total .

Three Forests, the Chippewa, Hiawatha, and Superior, reported an increase
in young produced this year. A slight decrease was noted on the Nicolet
and Ottawa NFs. The Chequamegon NF had no osprey young produced in 1987
and the Huron-Manistee NFs continue not to have a known breeding population
of ospreys.

- 2 -

BALD EAGLE NESTING SUCCESS

[

i

i

i

- 3 -

BALD EAGLE NESTING TRENDS

USDA-FOREST SERVICE, EASTERN REGION

YEAR VERIFIED
NESTS

BREEDING OCCUPIED SUCCESSFUL

AREAS NESTS NESTS

YOUNG

Per Per

Successful Occupied

No.

%

No.

%

No.

Nest

Nest

1964

156

64

50

36

56

51

1.4

.80

1965

204

113

63

62

55

88

1.4

• 78

1966

265

113

57

46

40

67

1.7

.59

1967

304

110

53

42

38

63

1.5

• 57

1968

323

119

66

55

98

1.9

.82

1969

344

166

129

78

72

56

109

1.5

• 85

1970

294

189

124

66

64

52

107

1.7

.86

1971

327

188

128

68

77

56

115

1.5

• 83

1972

356

238

167

70

97

58

155

1.6

• 93

1973

382

264

171

65

99

58

163

1.6

• 95

1974

381

257

170

66

89

52

119

1.3

.70

1975

398

285

176

62

117

67

192

1.6

1.09

1976

414

260

178

68

126

71

187

1.5

1.05

1977

421

265

197

75

138

70

212

1.5

1.08

1978

435

264

192

73

127

66

202

1.6

1.05

1979

432

269

188

70

132

70

222

1.7

1.18

1980

456

282

192

68

136

71

235

1.7

1.22

1981

458

277

202

73

140

69

22 3"

1 . 6

1.10

1982

446

288

202

70

136

67

220

1.6

1.09

1983

459

296

222

75

148

67

257

1.7

1.16

1984

458

294

218

74

140

64

231

1.7

1.06

1985

453

314

209*

67

136*

65

216*

1.6

1.03

1986

451

321

244

76

165

68

263

1.6

1.08

1987

516

366

281

77

188

67

315

1.7

1.12

Eagle nests in the BWCA were not surveyed for success.

EAGLE BREEDING AREAS BY FOREST

- 5 -

BALD EAGLE NESTING STATUS
USDA-FOREST SERVICE, EASTERN REGION

Year 198?

Forest and VERIFIED

NESTS

AREAS

OCCUPIED

SUCCESSFUL

YOUNG

STATE

1986

1987

OBSERVED

NESTS

NESTS

PRODUCED

Hiawatha

9

11

10

9

6

6

Huron-Manistee

17

18

14

11

7

15

Ottawa

65

71

46

33

15

28

MICHIGAN

91

100

70

53

28

49

Chippewa

209

237

158

135

89

151

Superior

84

105

75

50

38

59

MINNESOTA

293

342

233

185

127

210

Chequamegon

37

42

33

22

15

23

Nicolet

30

32

29

21

18

33

WISCONSIN

67

74

62

43

33

56

REGION TOTALS

451

516

365

281

188

315

6

OSPREY NESTING TRENDS

USDA-FOREST SERVICE, EASTERN REGION

YEAR VERIFIED TERRITORIES OCCUPIED SUCCESSFUL

NESTS OBSERVED NESTS _ NESTS _ YOUNG _

Per Per

No, %

1965

79

37

59

1966

94

28

45

1967

137

43

61

1968

152

73

1969

183

72

1970

157

93

84

90

1971

140

66

1972

205

130

111

85

1973

226

154

127

82

1974

252

140

140

100

1975

238

157

115

73

1976

249

154

117

76

1977

254

197

159

81

1978

316

193

144

75

1979

303

304

194

64

1980

305

308

224

73

1981

307

314

220

70

1982

320

294

217

70

1983

357

321

208

65

1984

343

327

248

76

1985

309*

355*

228*

64

1986

327*

232*

1987

384

252*

64

Successful Occupied

No.

I

No.

Nest

Nest

10

27

11

1.1

.30

5

1.3

12

28

23

1.9

= 53

21

29

27

1 = 3

= 37

28

39

55

2.0

.76

42

50

74

1.8

.88

34

52

55

1.6

.83

59

53

97

1.6

.87

21

38@

36

1=7

.65@

73

52

118

1.6

.84

59

51

102

1 = 7

= 97

70

60

120

1 = 7

1.03

89

56

147

1 = 7

= 92

63

44

84

1.3

.58

104

54

176

1 = 7

= 91

136

61

262

1 = 9

1.17

112

51

192

1,7

.87

l4l

65

229

1.6

1.06

126

61

207

1.6

1.00

125

50

222

1.8

.90

107*

47

181*

1 = 7

= 79

118*

51

185*

1.6

.80

157*

62

222*

1.4

.88

@ Chippewa NF incomplete data excluded from calculations.
* Osprey nesting surveys were not made in the BWCA

- 7 -

OSPREY NESTING STATUS
USDA-FOREST SERVICE, EASTERN REGION

Year 1987

Forest and VERIFIED

NESTS

AREAS

OCCUPIED

SUCCESSFUL

YOUNG

STATE

1986

1987

OBSERVED

NESTS

NESTS

PRODUCED

Ottawa

13

19

20

10

5

5

Hiawatha

30

32

34

30

20

40

Huron-Manistee

0

0

0

0

0

0

MICHIGAN

^3

51

54

40

25

45

Chippewa

171

212

212

138

87

116

Superior

73

89

98

55

33

47

MINNESOTA

244

301

310

193

120

163

Chequamegon

4

1

1

1

0

0

Nicolet

36

31

26

18

12

14

WISCONSIN

40

32

27

19

12

14

REGION TOTAL

327

384

391

252

157

222

- 8 -

BALD EAGLE AND OSPREY NESTING TRENDS BY NATIONAL FOREST

3

4

7

6

15

12

16

15

14

16

16

17

21

22

19

23

29

29

33

32

33

34

37

42

BALD EAGLE NESTING TRENDS
CHEQUAMEGON NATIONAL FOREST

TOTAL

BREEDING OCCUPIED SUCCESSFUL

AREAS NESTS _ NESTS _ YOUNG _

Per Per

Successful Occupied

No. % No. % No. Nest_ Nest

1

3

1 0

2 0

7

4

57

6

1.5

0

7

6

6

100

10

1.7

1.

10

8

3

38

4

1.3

9

9

7

78

10

1.4

1.

10

10

9

90

13

1.4

1.

12

11

6

55

8

1.3

.

13

10

4

40

6

1.5

e

15

12

7

58

11

1.6

0

15

13

10

77

16

1.6

1.

16

15

11

73

17

1.5

1.

17

13

8

62

11

1.4

o

19

16

13

81

21

1.6

1.

21

17

11

65

20

1.8

1.

21

19

90

13

68

19

1.2

1.

23

17

74

10

59

17

1.7

1.

21

15

71

9

60

14

1.6

0

22

16

73

14

88

22

1.6

1.

25

17

68

11

65

16

1.5

.

28

21

75

13

62

19

1.5

.

33

22

67

15

68

23

1*5

1.

10

OVD VO -tvD O O IXJUOMD rvjvn O'l-UOO (-*

YEAR

1964

1965

1966

1967

1968

1969

1970

1971

1972

1973

1974

1975

1976

1977

1978

1979

1980

1981

1982

1983

1984

1985

1986

1987

OSPREY NESTING SUCCESS TREND

CHEQUAMEGON NATIONAL FOREST

VERIFIED TERRITORIES OCCUPIED SUCCESSFUL

NESTS OBSERVED NESTS _ NESTS _ YOUNG _

Per Per

Successful Occupied

No. / No. % No. Nest_ Nest

1

1

2

1

1

1

1

1

1

4

3

3

4
2
4

3

4

4

5
4
4
4
1

1

1

2

0

1

1

1

1

1

4

3

3

4

3

4

5

4

4

5
4
4
4
1

1

1

2

1

1

1

1

1

3

2

1

1

0

2

3

4
4
2
4
2

3

1

NOT CHECKED

1

1

?

1

1

?

0

NOT CHECKED
0
1
0
1
0
2
3
3
1
0
1
2
1
0

0

0

1

0

3
0

4
6
6

3
0
2

4
2
0

11

55

76

107

135

142

139

141

143

142

147

156

163

176

194

200

201

209

199

193

214

203

201

209

237

BALD EAGLE NESTING TRENDS

CHIPPEWA NATIONAL FOREST

BREEDING OCCUPIED SUCCESSFUL

AREAS NESTS _ NESTS _ YOUNG _

Per Per

Successful Occupied

No.

%

No.

%

No.

Nest

Nest

20

6

30

10

1.7

30

12

40

14

1.2

39

22

56

29

1.3

52

19

61

28

1.5

49

21

43

30

1.4

71

52

33

63

50

1.5

75

60

29

48

44

1.5

93

65

35

54

62

1.8

99

65

40

62

61

1.5

107

73

40

55

70

1.8

108

70

42

60

72

1.7

1.0

106

68

40

59

54

1.4

.8

94

70

47

67

79

1.7

1.1

94

67

48

72

78

1.8

1.2

105

77

57

74

86

1-5

1.1

107

80

75

56

70

92

1.6

1.2

106

78

74

53

68

95

1.8

1.2

112

77

69

62

81

112

1.8

1.5

112

84

75

60

71

103

1.7

1.2

116

90

78

66

73

108

1.6

1.2

120

101

84

69

68

131

1 = 9

1.30

118

92

78

64

70

110

1=7

1.20

127

100

79

73

73

118

1.6

1.18

136

112

82

85

76

136

1 . 6

1.21

158

135

85

89

66

151

1 = 7

1.12

12

YEAR

1964

1965

1966

1967

1968

1969

1970

1971

1972

1973

1974

1975

1976

1977

1978

1979

1980

1981

1982

1983

1984

1985

1986

1987

OSPREY NESTING SUCCESS TREND

CHIPPEWA NATIONAL FOREST

VERIFIED TERRITORIES OCCUPIED SUCCESSFUL

NESTS

OBSERVED

NESTS

NESTS

YOUNG

No.

%

No.

%

No .

Per

Successful

Nest

Per

Occupied

Nest

18

23

5

31

60

17

7

14

73

40

13

19

89

49

23

50

99

52

52

28

54

48

90

49

49

22

39

104

59

59

34

60

124

72

72

NOT

CHECKED

139

83

67

35

52

59

131

56

56

29

52

46

138

50

50

24

48

43

146

87

87

80

37

42

66

1.8

.76

214

96

78

81

19

24

30

1.6

.38

201

201

122

61

59

48

97

1.6

.80

188

188

142

76

87

61

175

2.0

1.23

1,61

161

118

73

63

53

102

1.6

.86

157

145

111

77

73

66

111

1.5

1.00

176

161

93

58

49

53

83

1.7

• 89

164

160

125

78

53

42

94

1.8

.75

175

187

129

69

58

45

94

1.6

.73

171

--

124

—

51

41

82

1.6

. 66

212

~

138

65

87

63

116

1.3

.84

13

21

23

34

35

39

45

39

40

36

37

29

25

19

16

14

19

17

12

13

12

11

11

9

11

BALD EAGLE NESTING TRENDS

HIAWATHA NATIONAL FOREST

BREEDING OCCUPIED SUCCESSFUL

AREAS NESTS _ NESTS _ YOUNG _ _

Per Per

Successful Occupied

No.

%

No.

%

No.

Nest

Nest

17

74

6

35

7

1.2

7

27

2

29

4

2.0

17

11

2

18

3

1

4

57

4

20

10

1

2

24

9

2

44

4

14

6

2

33

3

22

5

0

0

24

7

2

3

20

6

1

l

26

8

2

2

23

7

1

1

16

6

2

3

11

4

1

1

14

2

0

0

14

4

3

75

4

1.3

9

4

2

50

4

2.0

9

5

56

3

60

4

1.3

9

6

67

2

33

2

1.0

• 33

9

5

56

2

40

4

2.0

.80

8

6

75

3

50

3

1.0

.50

8

6

75

3

50

5

1.7

.83

10

9

90

6

67

6

1.0

.67

14

OSPREY NESTING SUCCESS TREND

HIAWATHA NATIONAL FOREST

YEAR VERIFIED TERRITORIES OCCUPIED SUCCESSFUL

NESTS OBSERVED NESTS NESTS YOUNG

Per Per

Successful Occupied

No.

%

No.

%

No.

Nest

Nest

1964

13

1965

11

3

1

2

1966

12

9

1

2

1967

18

14

8

3

5

1968

20

9

5

5

1969

24

14

9

2

2

1970

26

16

10

3

7

1971

NO SURVEY

1972

24

15

11

6

8

1973

19

15

11

7

13

1974

16

15

10

6

60

13

1975

17

13

12

1

1

1976

26

23

15

9

60

16

1977

23

21

16

8

50

13

1978

20

18

16

14

1.4

1979

23

21

16

10

63

21

2.1

1.31

1980

24

20

11

6

55

10

1.7

• 91

1981

22

21

16

9

56

18

2.0

1.13

1982

22

24

19

10

53

21

2.1

1.12

1983

26

24

22

12

55

26

2.2

1.18

1984

25

25

20

80

12

60

25

2.1

1.25

1985

26

26

26

20

39

1-9

1.50

1986

30

33

29

88

20

69

32

1.6

1.10

1987

32

34

30

88

20

67

40

2.0

1.33

15 -

5

11

10

13

15

18

17

19

SIX

19

27

32

30

30

32

39

37

40

44

44

38

44

41

30

32

BALD EAGLE NESTING TRENDS

NICOLET NATIONAL FOREST

BREEDING OCCUPIED SUCCESSFUL

AREAS NESTS _ NESTS _ YOUNG _

Per Per

Successful Occupied

No.

l

No .

l

No.

Nest

Nest

4

1

2

9

9

11

4

36

7

1.8

12

9

6

67

12

2.0

11

7

7

100

14

2.0

16

9

5

56

6

1.2

.7

18

14

8

57

13

1.6

• 9

22

19

12

63

18

1.5

• 9

21

16

11

69

17

1.5

1.2

20

18

10

56

16

1.6

• 9

22

18

12

67

19

1.6

1.1

24

22

12

55

20

1.7

• 9

24

17

16

94

23

1.4

1.4

24

20

10

50

20

2.0

1.0

24

18

14

78

23

1.6

1.3

23

17

12

71

22

1.8

1.3

25

17

68

12

71

22

1.8

1.3

25

16

70

11

69

17

1.5

1.1

26

15

58

12

80

21

1.8

1.4

26

16

62

11

69

22

2.0

1.38

29

21

72

18

86

33

1.8

1.57

16

YEAR

1964

1965

1966

1967

1968

1969

1970

1971

1972

1973

1974

1975

1976

1977

1978

1979

1980

1981

1982

1983

1984

1985

1986

1987

OSPREY NESTING SUCCESS TREND

NICOLET NATIONAL FOREST

VERIFIED TERRITORIES OCCUPIED SUCCESSFUL

NESTS

OBSERVED

NESTS

NESTS

YOUNG

No.

»

No.

%

Per

Successful
No. Nest

Per

Occupied

Nest

10

10

7

4

3

10

7

16

9

16

11

26

17

6

1

1

19

14

15

8

15

NO SURVEY

30

25

17

4

6

31

29

19

7

12

37

37

25

10

40

15

36

35

15

12

80

26

32

32

20

11

55

22

2.0

1.10

27

35

19

13

68

22

1.7

1.16

29

30

20

7

35

11

1.6

.55

24

30

20

11

50

21

i»9

1.05

26

27

22

8

36

14

1.8

.64

32

26

20

6

30

11

1.8

.55

31

26

21

15

71

26

1.7

1.24

33

28

20

12

60

18

1.5

.90

28

26

14

54

8

57

18

2.3

1.29

28

28

19

68

7

37

10

1.4

.53

36

28

19

68

13

68

20

1.5

1.05

31

26

18

69

12

67

14

1.1

• 77

17 -

26

32

43

47

46

53

54

61

60

66

60

67

76

76

76

71

72

78

73

74

75

67

65

71

BALD EAGLE NESTING TRENDS

OTTAWA NATIONAL FOREST

BREEDING OCCUPIED SUCCESSFUL

AREAS NESTS _ NESTS _ YOUNG _ _

Per Per

Successful Occupied

No.

/

No.

%

No.

Nest

Nest

20

80

13

65

18

1.4

= 9

21

53

15

71

21

1.4

1.0

31

22

47

12

55

19

1.6

= 9

32

22

11

50

16

1.5

= 7

36

24

15

62

20

1.3

.8

36

26

13

50

20

1.5

.8

42

30

14

47

22

1.6

= 7

45

30

19

61

30

1.6

= 9

41

33

25

76

37

1 = 5

1.1

35

27

11

41

18

1.6

= 7

41

33

21

64

39

1 = 9

1.2

44

30

25"

33

39

1.6

1 = 3

42

31

22

71

36

1.6

1.2

43

31

21

68

33

1.6

1.1

43

30

23

77

37

1.6

1.2

44

30

21

70

32

1 = 5

1.1

45

32

73

24

75

37

1 = 5

1.2

46

31

67

16

52

27

1.7

= 9

46

33

78

17

52

26

1 = 5

= 79

46

29

63

15

52

22

1 = 5

.76

45

37

82

21

57

32

1 = 5

.86

42

38

90

16

42

26

1.6

.68

46

33

72

15

45

28

1 = 9

.85

18

YEAR

1964

1965

1966

1967

1968

1969

1970

1971

1972

1973

1974

1975

1976

1977

1978

1979

1980

1981

1982

1983

1984

1985

1986

1987

OSPREY NESTING SUCCESS TREND

OTTAWA NATIONAL FOREST

VERIFIED TERRITORIES OCCUPIED SUCCESSFUL

NESTS OBSERVED NESTS _ NESTS _ YOUNG _

Per Per

Successful Occupied

No.

f

No.

%

No.

Nest

Nest

6

6

5

3

1

1

8

9

6

1

2

9

8

7

2

2

8

7

0

12

10

6

3

7

10

11

8

5

8

10

8

8

3

7

13

10

9

1

2

14

11

8

4

50

8

2.0

1.00

11

10

10

5

50

13

2.6

1.30

12

12

10

5

50

7

1.4

.70

15

14

13

8

62

12

1 = 5

= 92

16

14

11

7

64

9

1 = 3

1.82

13

14

9

6

66

9

1 = 5

1.00

14

13

10

8

80

15

1 = 9

1.50

17

14

11

4

36

8

2.0

= 73

17

13

9

5

56

10

2.0

1.11

17

13

9

2

22

5

2 = 5

.56

13

12

11

92

4

36

5

1 = 3

.45

13

13

9

69

2

22

5

2.5

.56

13

16

9

56

6

67

9

1 = 5

1.00

19

20

10

50

5

50

5

1.0

.50

19 -

BALD EAGLE NESTING TRENDS

SUPERIOR NATIONAL FOREST

YEAR VERIFIED BREEDING OCCUPIED SUCCESSFUL

NESTS

AREAS

NESTS

NESTS

YOUNG

No.

%

No.

%

No.

Per

Successful

Nest

Per

Occupied

Nest

1963

1964

8

1965

32

20

14

24

1.7

1966

36

12

5

6

1.2

1967

37

5

4

7

1968

36

9

6

9

1969

53

12

11

16

1970

NO SURVEY

1971

49

10

10

10

14

1.4

1972

65

30

26

20

67

29

1.5

= 9

1973

67

48

26

19

73

24

1.3

= 9

1974

66

47

30

11

63

17

1975

75

75

26

23

89

35

1.5

1.4

1976

73

52

32

26

81

29

1.1

= 9

1977

65

52

39

29

74

43

1.5

l.l

1978

70

50

34

26

76

38

1.5

1.1

1979

68

51

36

23

64

40

1.7

l.l

1980

74

57

34

24

71

39

1.6

1.2

1981

76

53

34

64

23

68

32

1.4

= 9

1982

68

57

30

53

24

80

36

1 = 5

1.2

1983

73

61

40

66

32

80

50

1.6

1.25

1984

82

64

50

78

29

58

47

1.6

= 9

1985

84

70

24*

11*

46

18*

1.6

•75

1986

84

68

42

67

31

74

46

1 = 5

1.10

1987

105

75

50

67

38

76

59

1.6

1.18

* BWCA Success not surveyed.

20

OSPREY NESTING SUCCESS TREND

SUPERIOR NATIONAL FOREST

YEAR VERIFIED TERRITORIES OCCUPIED SUCCESSFUL

NESTS OBSERVED NESTS NESTS YOUNG

Per Per

Successful Occupied

No.

t

No.

%

No.

Nest

Nest

1964

7

1965

28

21

5

6

1966

31

8

2

2

1967

33

1

1

2

1968

33

6

1

1

1969

35

7

1

1

1970

NO SURVEY

1971

39

8

8

7

8

1972

36

22

15

12

80

16

1973

38

27

15

6

40

9

1974

42

49

27

18

67

23

1975

40

40

19

11

58

15

1976

38

34

21

21

100

32

1.5

1.04

1977

39

36

23

64

18

78

24

1.3

• 95

1978

35

32

21

66

16

76

20

1.3

.96

1979

38

34

25

74

16

64

24

1.5

1.44

1980

50

55

36

65

30

83

52

1.7

• 92

1981

71

60

51

85

32

63

47

1.5

• 92

1982

89

82

53

65

37

70

58

1.6

1.09

1983

100

90

62

69

51

82

75

1.5

1.21

1984

109

100

74

74

47

64

78

1.7

1.05

1985

63*

97*

43*

18*

42

29*

1.6

.67

1986

73*

71*

48*

68

27*

56

40*

1.5

.83

1987

89*

98*

55*

56

33*

60

47*

1.4

.85

* BWCA

not surveyed

21

32

27

28

29

27

25

25

19

20

22

22

21

19

16

17

13

15

20

22

16

15

15

17

18

BALD EAGLE NESTING TRENDS
HURON-MANISTEE NATIONAL FOREST

TOTAL

BREEDING OCCUPIED SUCCESSFUL

AREAS NESTS NESTS YOUNG

Per Per

Successful Occupied

No.

X

No.

%

No.

Nest

Nest

10

6

8

1.3

.8

11

5

8

1.6

• 7

16

16

3

19

4

1.3

• 3

11

4

36

6

1.5

.6

16

8

4

50

5

1.3

.6

15

9

4

44

4

1.0

• 5

15

8

4

50

5

1.3

.6

12

9

4

44

7

1.8

.8

13

10

5

50

6

1.2

.6

14

10

4

40

6

1.5

.6

13

11

6

55

9

1.5

.8

12

11

6

55

10

1.7

-9

12

11

5

45

8

1.6

• 7

12

8

3

38

7

2.3

• 9

12

9

4

44

6

1.5

• 7

10

10

5

50

8

1.6

.8

13

11

4

36

5

1.3

.5

14

12

86

5

42

6

1.2

• 5

14

10

71

7

70

12

1.7

1.2

12

10

83

5

50

9

1.8

• 9

13

10

77

5

50

8

1.6

.8

13

9

69

6

67

9

1.5

1.0

14

11

79

7

64

15

2.1

1.3

- 22 -

I

I

[

I

[

l

f

I

1

I

I

1

1

I

I

I

]

I

I

1

1

I