. The Canadian field-naturalist. 1980 Notes 333 JUN MAY APR MAR FEB JAN DEC NOV OCT r= J I I i_ AGE (yr) Figure 3. Relationship between age and date of antler drop among radiocollared bull Woodland Caribou during March 1976-June 1978 on the Birch Mountain Study Area. Ages were determined from tooth- cementum annuli. Thus, for a good part of fall and winter, adult cows and young bulls appeared similar in size, retained antlers of the same size and shape, and were therefore largely indistinguishable from the air; adult bulls and calves, however, were easily identifi
. The Canadian field-naturalist. 1980 Notes 333 JUN MAY APR MAR FEB JAN DEC NOV OCT r= J I I i_ AGE (yr) Figure 3. Relationship between age and date of antler drop among radiocollared bull Woodland Caribou during March 1976-June 1978 on the Birch Mountain Study Area. Ages were determined from tooth- cementum annuli. Thus, for a good part of fall and winter, adult cows and young bulls appeared similar in size, retained antlers of the same size and shape, and were therefore largely indistinguishable from the air; adult bulls and calves, however, were easily identified. Acknowledgments This work was funded by the Alberta Oil Sands Environmental Research Program (AOSERP) and jointly supervised by the Department of Wildlife Ecology, University of Wisconsin, Madison, and the Alberta Fish and Wildlife Division. We give special thanks for the field assistance of J. Jorgenson, T. Hauge, L. Windberg, J. Haigh, R. Rolley, R. Lewis, and the pilots and crews of Lift Air Limited and Alert Aviation Limited. Literature Cited Bergerud, A. T. 1971. The population dynamics of New- foundland Caribou. Wildlife Monograph Number 25. 55 pp. Bergerud, A. T. 1976. The annual antler cycle in New- foundland Caribou. Canadian Field-Naturalist 90: 449-463. Kelsall, J. P. 1968. The migratory Barren-ground Caribou of Canada. Canadian Wildlife Service Monograph Number 3. 340 pp. Miller, F. L. 1974. Age determination of Caribou by annu- lations in dental cementum. Journal of Wildlife Manage- ment 38: 47-53. Parker, 1972. Biology of the Kaminuriak population of Barren-ground Caribou. Part 1; Total numbers, mortal- ity, recruitment and seasonal distribution. Canadian Wild- life Service Report Series Number 20. 93 pp. Skoog, R. O. 1956. Ranges, movements, population and food habits of the Steese-Fortymile Caribou herd. thesis. University of Alaska, Fairbanks. 145 pp. Received 13 October 1979 Accepted 18 January 1980 Flowering Rush {Butomus umbellatus) in the Can
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