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Habitat, Survival, Productivity, and Abundance of Pheasants in Western Oregon, 1947-1975
Robert L. Jarvis and Susan Gay Simpson
The Journal of Wildlife Management
Vol. 42, No. 4 (Oct., 1978), pp. 866-874
Stable URL: http://www.jstor.org/stable/3800776
Page Count: 9
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Indices of survival, productivity, and density were derived from annual censuses of ring-necked pheasants (Phasianus colchicus) in the Willamette Valley from 1947 to 1975. Abundance of pheasants in spring was moderate and variable in the late 1940's and early 1950's (10-20 birds/40.5 ha), increased in the early 1960's (35-40/40.5 ha), and decreased in the early 1970's (3-8/40.5 ha). Amount of land in soil bank was closely correlated to abundance of pheasants in spring. Reproductive performance remained relatively constant from 1949 to 1975. Survival of adult females during summer and during winter were significantly correlated (r = 0.89) to annual percent change in total density of pheasants in spring. About 25 to 30 percent of the pheasant habitat in the Willamette Valley was lost between 1945 and 1970. Survival of adult females was the most important factor affecting long term trends in population size.
The Journal of Wildlife Management © 1978 Wiley