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

125
Actual count
Inside Outside Estimated Artificial
Date Total park park population' reduction Comments from sources
1954 Dec. 334 207 Livetrapping was in early 1954.
1955 Fall 400 207 Trapping tried in early 1955, but unsuccessful.
1956 March 356431 356-431 Helicopter census. Good conditions. Total seen was 356 with
possibly 75 more on North end Mt. Everts where separation of
bands was questionable.
1956 Dec. 395 385 10 Ideal counting conditions.
1957 330 120 Livetrapping was in February.
1958 Feb. 20 158 158 Not Seven men, poor counting conditions. "I seriously question the
covered
completeness of the recent count, as antelope very probably were
dispersed over more area than that. .. covered ..."
1959 ? 400
1961 Mar. 299 299 Not Helicoptered census specifically for pronghorn.
17 covered
1962 Apr. 4 278 300 Helicopter census specifically for pronghorn; 35 min. flying time;
coverage to about 1 mile north of park boundary.
1963 Springb 350
1964 Spring b 350 25 Livetrapping Dec. 16, 1964.
1965 Jan. 5 182-210 300 7 Partial helicopter census in conjunction with livetrapping of
Springb pronghorn. Livetrapping Jan. 6, 1965,
1966 Spring b 200 94 Reduction by shooting between summer 1965 and April 1966.
1967 March 188 188 0 200 6 Reduction by shooting in October 1967. Helicopter census; good
Spring h
to excellent condition; partial coverage outside park; probably
included 95 % of pronghorn on winter range inside the park.
1968 Dec. 149 200 Special pronghorn census from Piper Supercub.
Spring b
1968 Mar. 85 43 42 Helicopter census specifically for pronghorn. Area outside of
park covered to Carbella but not as intensively as inside park.
Severe winter had caused many to leave the park; hard to get
complete count.
1969 Mar 133 133 150 Special antelope count by Piper Supercub. Partial coverage
Spring h
outside park, but not as intensive as inside.
1970 Jan. 158 170 Comments as above.
Spring b
Data
source C
37
37
38
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
a Date for which estimate applies unknown unless otherwise indicated.
h Spring before fawns are born.
DATA SOURCES: (1) Skinner, 1922; (2) Bailey, 1930; (3) Superintendent's Annual Report, 1912; (4) Halloran and Glass, 1959; (5)
Superintendent's Annual Report, 1918; (6) Superintendent's Annual Report, 1920; (7) Woodring, 1922 for count, Superintendent's Annual
Report for 1921-22 for estimate; (8) Loyster, 1922; (9) Superintendent's Annual Report, 1923; (10) Woodring, 1924; (11) Superintendent's
annual report, 1925; (12) Superintendent's Annual Report, 1926; (13) Superintendent's Annual Report, 1927; (14) Baggley, n.d.; (15)
Baggley, 1931; (16) Anonymous, 1933; (17) Anonymous, 1936; (18) Skinner, 1936b; (19) Barrows, 1937b; (20) Barrows, 19~8b; (21)
Barrows, 1939b; (22) Barrows, 1940; (23) Skinner, 1941a; (24) Superintendent's Annual Report, 1942; (25) Superintendent's Annual
Report, 1943; (26) Anonymous, 1944; (27) Anonymous 1945a,b; (28) Anonymous, 1946; (29) Rogers, 1948 for the count, Kittams, 1947
for the estimate, LaNoue, 1948a for the reduction; (30) Grimm, 1948; (31) LaNoue, 1948b; (32) Joffe, 1949 for count, Anonymous, 1949a
for estimate; (33) Anonymous, 1950; (34) Johnston, 1951 for count, Evans, 1951 for estimate; (35) Chapman, 1953; (36) Kittams, 1953b
for count, Kittams, 1953b for estimate, Superintendent's annual report, 1953; (37) Anonymous, 1955; (38) Kittams, 1956; (39) Kittams,
1957a; (40) Kittams, 1958b; (41) Chapman, 1960; (42) Howe, 1961b; (43) Howe, 1962a for count, Howe, 1962b for estimate, Management
Assistant for Yellowstone National Park, 1962 for coverage; (44) Howe, 1963b; (45) Howe, 1964; (46) Barmore, 1965b for count; Howe,
1965c for estimate, (47) Barmore, 1966; (48) Bannore 1967b for count, Barmore, 1967c for estimate; (49) this study for count, Barmore,
1968a for estimate; (50) Barmore, 1968b; (51) this study; (52) this study for count, Bucknall, 1970 for estimate.