Yellowstone's Northern Range - Greater Yellowstone Science ...

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Ground and aerial counts of bighorn sheep on northern winter range, 1971-1996. (Source: Houston 1982:439; YNP Files.) 130 Aerial Ground Data Year Count Count Comments Source' 1971 227 Maximum on 4/3 and 14 of five counts from 12/31-5/1 (see text); range, 128-227 sheep. Abiathar Peak and other areas in extreme NE corner of the park were not covered on these flights unless otherwise mentioned. 1972 373 Maximum on 4/3 and /4 of five flights from 12/2-513; range, 169-373. One flight per year aimed to coincide with particular environmental conditions from this year through 1978 (see text). 1973 332 Maximum on 4/26 and 127 of four flights from 12/9-4127; range 225- 332. 1974 446 Maximum on 4122 and 23 of four flights from 113-4/23; range, 141- 466. 1975 b 404 Maximum on 5/13 and 14 of four flights from 12129-5/14; range, 152- 404. 1976 426 Maximum on 517 and 8 of four flights from 12117-518; range, 110- 426. 1977 430 Maximum on 4121 and 22 of three flights from 1123-4/22; range, 130- 430. An additional 10 sheep counted on Abiathar Peak on 3116. 1978 471 Maximum on 4128 and 5/4 of four flights from 12120-5/4. An additional 20 sheep counted on Abiathar Peak on 5/4. 1979 89 Ground count of sheep between Mt. Everts, YNP and Point of Rocks, 2 Montana 1980 265 Ground count of sheep. between Mt. Everts. YNP and Point of Rocks, 2 Montana 1981 156 Ground count of sheep between Mt. Everts, YNP and Point of Rocks, 2 Montana 1982 72 2 1983 38 2 1984 46 2 1985 59 2 1986 93 2 1987 108 2 1988 117 2 1989 121 2 1990 151 2 1991 69 2 1992 222 105 Ground count done in December as usual; aerial count was done by 3 helicopter later in spring and covered more area inside YNP toward Soda Butte.
131 Year Aerial Count Ground Count Comments Data Source' 1993 79 3 1994 141 115 Helicopter count done in spring; ground count done in winter and covered less area. 3 1995 152 116 Helicopter count done in spring; ground count done in winter and covered less area, 3 1996 182 103 Helicopter count done in spring; ground count done in winter and covered less area, 3 ·a DATA SOURCES: (1) Houston, 1982; (2) YNP Files; (3) YNP Files; aerial count information provided to YNP by T. Lemke, MDFWP in unpubl. repts. b In addition, the Absaroka Mountains were searched inside the east boundary of <strong>Yellowstone</strong> Park for sheep on 2124, 3/14, and 4/17, 18, 21175. None were observed.
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YELLOW"STONE'S NORTHERN RANGE COMPL
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Suggested citation: Yellowstone Nat
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c=J Northern Winter Range _ Boundar
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Aspen, willows, and biodiversity ..
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vii
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THE NORTHERN RANGE xii range criter
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THE NORTHERN RANGE 2 Figure 1.1. Ph
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THE NORTHERN RANGE tion. There was
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THE NORTHERN RANGE 6 Figure 1.6. Gr
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THE NORTHERN RANGE 8 Figure 1.8. El
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THE NORTHERN RANGE 10 unpopular or
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THE NORTHERN RANGE 12 earlier Yello
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THE NORTHERN RANGE 16 Northern rang
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Figure 2.3. Sum ot rotal annual riv
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THE NORTHERN RANGE 20 Figure 2.4 Tr
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THE NORTHERN RANGE 22 dendrochronol
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THE NORTHERN RANGE 24 Figure 2.7. A
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THE NORTHERN RANGE 26 et al. (1991)
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THE NORTHERN RANGE 28 earlier time,
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.', P (/ i0~ , • 9 ~ § , , ~ , i
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THE NORTHERN RANGE 32 systems-range
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THE NORTHERN RANGE 34 indicates the
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THE NORTHERN RANGE 36 Data were gat
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THE NORTHERN RANGE 38 grazed and un
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THE NORTHERN RANGE showed that graz
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Figure 4.1. Northern range, showing
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Figure 4.2. Willow distribution in
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THE NORTHERN RANGE 48 Figure 4.4. I
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THE NORTHERN RANGE 50 public lands,
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THE NORTIlERN RANGE 52 Figure 4.5.
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THE NORTHERN RANGE 54 able uncertai
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THE NORTHERN RANGE 56 to confirm an
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THE NORTHERN RANGE 58 RESEARCH RECO
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SOIL, EROSION, SEDIMENTS, AND WATER
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SOIL, EROSION, SEDIMENTS, AND WATER
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ated with ungulate winter ranges. T
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ELK POPULATION ISSUES IS YELLOWSTON
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ange grazing issue, Yellowstone man
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ELK POPULATION ISSUES 71 ... Other
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ELK POPULATION ISSUES 73 1996d), so
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ELK POPULATION ISSUES 75 the northe
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ELK POPULATION ISSUES 77 It has evo
Page 96 and 97: 4 , ~ 1 v " 'It , \ J~ ~""~ .:,~ ",
Page 98 and 99: THE NORTHERN RANGE 82 Competition t
Page 100 and 101: Figure 7.3. Bison winter range. Sin
Page 102 and 103: THE NORTHERN RANGE Figure 7.7. Envi
Page 104 and 105: THE NORTHERN RANGE 88 not aware of
Page 106 and 107: THE NORTHERN RANGE 90 tion size, an
Page 108 and 109: THE NORTHERN RANGE 92 activity (95
Page 110 and 111: THE NORTHERN RANGE 94 pursue the su
Page 112 and 113: THE NORTHERN RANGE 96 factors were
Page 114 and 115: THE NORTHERN RANGE Figure 7.13. Num
Page 116 and 117: , .. , , " , ! I ." ~, ~ " ,.\ ,•
Page 118 and 119: THE NORTHERN RANGE 102 complex set
Page 120 and 121: THE NORTHERN RANGE 104 practically
Page 122 and 123: THE NORTHERN RANGE 106 appear suppr
Page 124 and 125: AppendixA. Conferences, Meetings, a
Page 126 and 127: lJO Year Estimate Comment Source 19
Page 128 and 129: lJ2 , Estimated # of Elk Year Date
Page 130 and 131: lJ4 Winter Total Count 1967-68 397
Page 132 and 133: 116 Year Date of Count Parkwide Par
Page 134 and 135: 118 Counts and estimates of mule de
Page 136 and 137: 120 Northern Yellowstone winter ran
Page 138 and 139: 122 Population estimates and reduct
Page 140 and 141: 124 Actual count Inside Outside Est
Page 142 and 143: Pronghorn counted during spring sur
Page 144 and 145: 128 Year 1939 1940 1941 1942 1943 1
Page 148 and 149: REFERENCE LIST NOTES ON THIS REFERE
Page 150 and 151: Pages 199-210 in Carbyn, L.N., S.H.
Page 152 and 153: Yellowstone National Park. Technica
Page 154 and 155: mammal mortality in the 1988 Yellow
Page 156 and 157: National Park. International Journa
Page 158 and 159: Mehus, C.A. 1995. Influences ofbraw
Page 160 and 161: __ , and __ . 1996a. Preburn root b
Page 162 and 163: Pages 127-138 in F.J. Singer, ed. E
Page 164 and 165: some northern Yellowstone elk. M.S.
Page 166: I I I I I
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Yellowstone's Northern Range - Greater Yellowstone Science ...

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