. Bulletin. Natural history; Natural history. Sept., 1970 Bellrose & Crompton: Micrational Behavior of Ducks 217. --y ...t^" / ^3'] —" STANDARD DEVIATION Direct Recoveries STANDARD DEVIATION Fig. 24. — The longitudinal distribution of black duck indirect recoveries as compared to direct recoveries on the basis of mean and standard deviation lines. Black ducks banded at McGinnis Slough. Cook County, Illinois, 1940-1947. and indirect recoveries for the latitude of the banding station (41°-42°) would be the same, inasmuch as local direct recoveries represent the time remaining durin
. Bulletin. Natural history; Natural history. Sept., 1970 Bellrose & Crompton: Micrational Behavior of Ducks 217. --y ...t^" / ^3'] —" STANDARD DEVIATION Direct Recoveries STANDARD DEVIATION Fig. 24. — The longitudinal distribution of black duck indirect recoveries as compared to direct recoveries on the basis of mean and standard deviation lines. Black ducks banded at McGinnis Slough. Cook County, Illinois, 1940-1947. and indirect recoveries for the latitude of the banding station (41°-42°) would be the same, inasmuch as local direct recoveries represent the time remaining during the hunting season which the ducks spent in the vicinity of the band- ing station. A small proportion of black ducks (as shown by the difference between di- rect and indirect recoveries) either stopped at the latitude immediately north of the banding station or continued south to other areas, principally between southern Illinois and northern Missis- sippi. The direct recoveries show a north- ward reversal of movement from Mc- Ginnis Slough. Nearly all of the black ducks went no farther than 1 degree north (Table 26). Such northward move- ments may represent birds searching for new feedins grounds, or those that over-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
