. Bulletin. Natural history; Natural history. Sept., 1970 Bellrose & Crompton: Migrational Behavior of Ducks 193. Fig. 13. — The longitudinal distribution of mallard indirect recoveries on the basis of nnean and standard deviation lines. Mallards banded at the Union County Wildlife Management Area, near Ware, Illinois, 1954-1966. tude of the banding station fell within a longitudinal span of 175 miles. Standard deviation of indirect band recoveries from Union County is small- est from the banding station south along the Mississippi River to southern Arkan- sas. There the path of recoveries
. Bulletin. Natural history; Natural history. Sept., 1970 Bellrose & Crompton: Migrational Behavior of Ducks 193. Fig. 13. — The longitudinal distribution of mallard indirect recoveries on the basis of nnean and standard deviation lines. Mallards banded at the Union County Wildlife Management Area, near Ware, Illinois, 1954-1966. tude of the banding station fell within a longitudinal span of 175 miles. Standard deviation of indirect band recoveries from Union County is small- est from the banding station south along the Mississippi River to southern Arkan- sas. There the path of recoveries is only 100-140 miles wide. Standard deviation shows that the broadest recovery path is between the western border of Minne- sota and the Mississippi River along the border of Illinois. In this region the delineated path is from 200 to 250 miles wide. This wide path across southwest- ern Minnesota and diagonally across Iowa results both from the spread in band recoveries in any one year, and from variations in the yearly mean. Fig. 14 shows the variation in the yearly mean longitude distribution of. 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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