. Bulletin. Natural history; Natural history. 1970 Bellrose & Crompton: Migrational Behavior of Ducks 205 84 78 72 H 66 60- 54- 48- 42- 36 30 24-1 18 12- 6- 0. ⢠⢠@ ® © ⢠® © © © ® © © © © ® ⢠© © © m © © ® ® © (B (@) @ © © @ ® ⢠® ® ® © ⢠© ® © . © © © © © 40 39 38 37 36 35 34 DEGREES OF LATITUDE © 33 32 Fig. 18. â The percentage grouping of mallard recoveries, based on tinne versus distance, showing the variation in individual rate of passage southward. Mallards banded at Lake Chautauqua, 1939-1944, 1947-1952. behavior, there is an eviden
. Bulletin. Natural history; Natural history. 1970 Bellrose & Crompton: Migrational Behavior of Ducks 205 84 78 72 H 66 60- 54- 48- 42- 36 30 24-1 18 12- 6- 0. ⢠⢠@ ® © ⢠® © © © ® © © © © ® ⢠© © © m © © ® ® © (B (@) @ © © @ ® ⢠® ® ® © ⢠© ® © . © © © © © 40 39 38 37 36 35 34 DEGREES OF LATITUDE © 33 32 Fig. 18. â The percentage grouping of mallard recoveries, based on tinne versus distance, showing the variation in individual rate of passage southward. Mallards banded at Lake Chautauqua, 1939-1944, 1947-1952. behavior, there is an evident relationship in recoveries between time and distance. It also seems apparent that there is a seasonal relationship between time and distance traveled. Table 19 shows the mean miles per day traveled by age and sex classes of seasonally banded samples of mallards. Miles per day were derived from the distance of the banding station to location of the band recovery in relation to time. The low rate of movement during the Table 19. â Seasonal change in rate of passage of mallard age and sex groups from Lake Chautauqua, 1939-1944. Based on distance traveled in relation to number of days from banding for direct recoveries, and expressed in mean number of miles per day. Week Adult Drakes Juvenile Drakes He7U of Banding Number Miles per Day Number Miles per Day Number Miles per Day Oct. 11-17 28 58 44 " 18-24 58 62 57 " 25-31 73 82 35 Nov. 1- 7 69 89 48 " 8-14 109 30 43 'â 15-21 87 76 24 " 22-2S 88 75 51 " 29-Dec. 5 34 30 26 Average 74 74 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. Natu
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
