. Bulletin. Natural history; Natural history. 518 Illinois Natural History Survey Bulletin Fol. 22, Art. 7 out as yielding most skunks. These are rollint; and brushy. An area in the south central part of Illinois, another around. Fig. 9.—Distribution of skunks in Illinois as indicated by fur-takers' monthly reports for the seasons of 1929-30, 1930-31 and 1934-35 through 1939-40. Data from these eight sea- sons of monthly reports have been transferred to the map in such a way that the county hav- ing the largest average catch per fur-taker has the greatest density of dots; other coun- ties are
. Bulletin. Natural history; Natural history. 518 Illinois Natural History Survey Bulletin Fol. 22, Art. 7 out as yielding most skunks. These are rollint; and brushy. An area in the south central part of Illinois, another around. Fig. 9.—Distribution of skunks in Illinois as indicated by fur-takers' monthly reports for the seasons of 1929-30, 1930-31 and 1934-35 through 1939-40. Data from these eight sea- sons of monthly reports have been transferred to the map in such a way that the county hav- ing the largest average catch per fur-taker has the greatest density of dots; other coun- ties are dotted proportionally. The numbers in the margins represent for each county indi- cated the average catch per square mile as revealed by Brown's survey for the 1938-39 and 1939-40 seasons. In general, a close cor- relation exists between the two sets of data, despite the fact that one is for eight seasons and the other for two. Springfield and a third around Cook County show yields of the smallest num- bers. Among those counties that were sur- veyed by Brown, Franklin shows the smallest yield per square mile, and Union, Jo Daviess and Calhoun counties the largest. The yield in Union County was 13 times as large as the yield in Franklin County. Trappers, Catch and Income.—In- dex figures for per cent of fur-takers catching skunks show a general decline, table 5. The index figure is 55 for 1929- 30 and 44 for 1941-42, but in intervening years figures as high as 59 and 64 are recorded. The average catch indices also decline; from during the 1934-35 season, the trend is downward, with some irregulari- ties, to during the 1941-42 season, table 5. For 1938-39 and 1939-40, index figures for per cent of fur-takers catching skunks are the same as, to 8 points higher than, corresponding figures calculated from data accumulated during the course of the oral survey. The average-catch-per-efifective- fur-taker indices are from to point higher than the average catch per f
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
