. The Canadian field-naturalist. 94 The Canadian Field-Naturalist Vol. 80 125 100 75 50 25. ^ J J 1959 J J I960 J J 1961 J J 1962 J J 1963 Figure 3. The curves from Figure 2 (bottom) compared with the generalized curve of Pitelka (1957) for the Leimjiiis cycle at Point Barrow, Alaska. The recording of changes in the abundance of Aberdeen Lake lemmings, and their apparent synchrony between species and between places, is the main object of this report. Some comments on the shape of the curve constructed about the index points have also been made. For a study of the biological phenomena associate
. The Canadian field-naturalist. 94 The Canadian Field-Naturalist Vol. 80 125 100 75 50 25. ^ J J 1959 J J I960 J J 1961 J J 1962 J J 1963 Figure 3. The curves from Figure 2 (bottom) compared with the generalized curve of Pitelka (1957) for the Leimjiiis cycle at Point Barrow, Alaska. The recording of changes in the abundance of Aberdeen Lake lemmings, and their apparent synchrony between species and between places, is the main object of this report. Some comments on the shape of the curve constructed about the index points have also been made. For a study of the biological phenomena associated with Keewatin lemming cycles, and their possible causa- tion, the reader is referred to Krebs (1963, 1964). For critical readings of this note in manuscript, I am indebted to Dr. C. J. Krebs of the University of Indiana, and to Dr. D. A, Munro, Mr. A. G. Loughrey and Mr. D. Eagles of the Canadian Wildlife Service. References Bee, J. W. and E. R. Hall. 1956. Mammals of northern Alaska. University of Kansas Museum of Natural History Miscellaneous Publication No. 8. 309 pp., illus. Bird, J. B. 1951. The physiography of the middle and lower Thelon Basin. Geo- graphical Bulletin 1: 14-28. Kelsall, J. P. 1960. Co-operative studies of barren-ground caribou 1957-58. Can- adian Wildlife Service Wildlife Manage- ment Bulletin (1) 15. 4 + 145 pp., illus. Krebs, C. J. 1963. Lemming cycle at Baker Lake, Canada, during 1959-62. Science 140 (3567): 674-76. 1964. The lemming cycle at Baker Lake, Northwest Territories, dur- ing 1959-62. Arctic Institute of North Am- erica Technical Paper No. 15, 104 pp., illus. Lack, D. 1954. The natural regulation of animal numbers. 8 -\- 343 pp., illus. Ox- ford. Pitelka, F. A. 1957. Some aspects of popu- lation structure in the short-term cycle of the brown lemming in northern Alaska. Cold Spring Harbour Symposium on Quantitative Biology 22:237-251. Received for publication 21 September 1965. Please note that these images are extracted from scanned page im
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