. Bulletin. Natural history; Natural history. Illinois Natural History Survey Bulletin Vol. 30, Art. 3. Fig. 23. — The longitudinal distribution of black duck indirect recoveries on the basis of mean and standard deviation lines. Black ducks banded at Lake Chautauqua, 1939-1944, 1947-1952. of black ducks migrated south-southeast from north-central Wisconsin to north- eastern Illinois. From that point, the center of the distribution approximated the course of the Illinois River valley to Lake Chautauqua. Apparently on departing Lake Chau- tauqua most black ducks headed south- southeast for the
. Bulletin. Natural history; Natural history. Illinois Natural History Survey Bulletin Vol. 30, Art. 3. Fig. 23. — The longitudinal distribution of black duck indirect recoveries on the basis of mean and standard deviation lines. Black ducks banded at Lake Chautauqua, 1939-1944, 1947-1952. of black ducks migrated south-southeast from north-central Wisconsin to north- eastern Illinois. From that point, the center of the distribution approximated the course of the Illinois River valley to Lake Chautauqua. Apparently on departing Lake Chau- tauqua most black ducks headed south- southeast for the area embracing the mouth of the Wabash River. South of this point, the axial line of recoveries was similar to the course of the Missis- sippi River. From Lake Chautauqua south, the distribution of black duck recoveries (Fig. 23) was very similar to that of mallards banded at the same place (Fig. 7). North of Lake Chau- tauqua, the indirect recoveries from black ducks were 200 or more miles east of those derived from mallards, re- flecting the more eastward breeding range of the black duck. The standard deviation lines denote a wide distribution of band recoveries in. 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
