. Bulletin. Natural history; Natural history. Sanderson & Anderson: Waterfowl 669 Fig. 3,—Relative abun- dance of mallards at Lake Sangchris and in the Illinois River valley from Spring Valley to Meredosia during fall and winter from 1972-1973 through! 1976-1977. 100- go- so- 70- 60- 50- 40- 30- 20- 10- 0-. = ILLINOIS VALLEY = LAKE SANGCHRIS ' I ' I M M M ' I ' I ' 1I15I29I12I25I12I26I9 18 2 16 30 13 11 11 25 8 22 5 19 5 19 2 SEPT. OCT. NOV. DEC. JAN. FEB. MAR. APR. Fishing was not permitted in the intake arm or the control arm during the water- fowl hunting season. However, fishe
. Bulletin. Natural history; Natural history. Sanderson & Anderson: Waterfowl 669 Fig. 3,—Relative abun- dance of mallards at Lake Sangchris and in the Illinois River valley from Spring Valley to Meredosia during fall and winter from 1972-1973 through! 1976-1977. 100- go- so- 70- 60- 50- 40- 30- 20- 10- 0-. = ILLINOIS VALLEY = LAKE SANGCHRIS ' I ' I M M M ' I ' I ' 1I15I29I12I25I12I26I9 18 2 16 30 13 11 11 25 8 22 5 19 5 19 2 SEPT. OCT. NOV. DEC. JAN. FEB. MAR. APR. Fishing was not permitted in the intake arm or the control arm during the water- fowl hunting season. However, fishermen were allowed in all areas except the slag pond before and after the waterfowl season. Thus, hunting was a factor in- fluencing waterfowl use in the unit with unheated water and fishing was a factor in the unit with heated water. Although we will use such terms as "preference for the warmer water" and "avoidance of the cooler water," we recognize that any correlations between duck density and water temperature may be results of factors other than a response to water temperature per se. Thus, food might be more abundant and available in the heated (or unheated) water than in the unheated (or heated) water. The presence of waterfowl attracted to the food might in turn attract other water- fowl with different feeding habits to the Table 7.—Average numbers by month of each September 1974 through March 1977. species of waterfowl in the Illinois Valley from Species Sept. Oct. Nov. Dec. .Ian. Mar. Surface-feeding ducks Mallard Black duck Pintail Wigeon Blue-winged teal Green-winged teal Gadwall Shoveler Diving ducks Scaup Ring-necked duck Canvasback Redhead Ruddy duck Goldeneye Mergansers Geese Canada goose Blue & snow goose Wood duck Coot Average numbeT of waterfowl present 11,833 471,607 368,303 223,475 566 2,079 11,341 10,918 5,858 6,729 2,619 9,357 5,260 285 0 22,278 3,414 11,313 2,018 1,683 25,922 23,398 2,718 364 5 0 4,051 4,
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