. Distribution and abundance of pheasants in Illinois. Pheasants; Birds. Fig. 14. â Abundance v-, of pheasants in Illinois by counties. Counties are ranked in order of abun- dance of pheasants. Data were obtained from six rural mail carrier censuses con- ducted in 1957 and 1958. INDICES OF PHEASANT ABUNDANCE 1957-1960 Q-LOCATION OF CENSUS ROUTE Key (Eiomple: Chompolgn Counly) 16= 1957 38. 1958 34= 1969 20= I960 Fig. 15. â Distribution and abundance of pheasants in selected Illinois census areas as indicated by popu- lation indices based on win- ter sex ratios and spring counts of cock calls, 1
. Distribution and abundance of pheasants in Illinois. Pheasants; Birds. Fig. 14. â Abundance v-, of pheasants in Illinois by counties. Counties are ranked in order of abun- dance of pheasants. Data were obtained from six rural mail carrier censuses con- ducted in 1957 and 1958. INDICES OF PHEASANT ABUNDANCE 1957-1960 Q-LOCATION OF CENSUS ROUTE Key (Eiomple: Chompolgn Counly) 16= 1957 38. 1958 34= 1969 20= I960 Fig. 15. â Distribution and abundance of pheasants in selected Illinois census areas as indicated by popu- lation indices based on win- ter sex ratios and spring counts of cock calls, 1957- 1960 (after William L. Preno unpublished). Index numbers for each census area read from top to bot- tom, 1957 through County and adjacent portions of Ford County. Detailed ecological studies on a township-sized study area in this region indicated that pheasants numbered 63, 80, and 88 birds per square mile in January, 1957 and 1958, and February, 1960, respectively. Pheasants declined in numbers in all directions from the nucleus of abundance in Ford and Livingston counties; this decline was most apparent to the southwest. The rural mail carrier counts showed some po]jula- tions of pheasants, usually of low levels, outside the boundaries of the contiguous range, fig. 8. Some of these outlying populations have persisted for many years. One such population, greater in numbers and more per- sistent than other outlying populations, is located in Logan and Tazewell counties. A small population of pheasants has existed in Bond County, about 40 miles east of St. Louis, for many years, and most of the township distribution maps in this report indicate the presence of an isolated population of pheasants where Hancock, Henderson, McDonough, and Warren coun- ties in western Illinois come into close 'I'he extent to which these small, persistent populations arc maintained through periodic releases of pheasants by private individuals or agencies is not known. Some o
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