. The Canadian field-naturalist. 1972 Notes 379. 7 8 COVER 9 10 PLANTS Figure 1. Ground Cover Estimates. The ground cover plants are 1-Lichens, 2-Mosses, 3-Ground Pine (Lycopodium spp.), 4-Horsetail {Equisetum spp.), 5-Blueberry (Vaccinium angustifolium), 6-Sar- saparilla (Aralia nudicaulis), 7-Bunchberry {Cornus canadensis), 8-Grasses (Gramineae), 9-Aster (Aster macrophyllus), lO-Bracken fern {Pteridium aquilinum), 11-Shrubs and seedlings, 12-Fallen green trees, 13-Raspberry {Rubus strigosus), 14-Miscellaneous. and that the juveniles are driven into the less pre- ferred blowdown. Acknowledgem
. The Canadian field-naturalist. 1972 Notes 379. 7 8 COVER 9 10 PLANTS Figure 1. Ground Cover Estimates. The ground cover plants are 1-Lichens, 2-Mosses, 3-Ground Pine (Lycopodium spp.), 4-Horsetail {Equisetum spp.), 5-Blueberry (Vaccinium angustifolium), 6-Sar- saparilla (Aralia nudicaulis), 7-Bunchberry {Cornus canadensis), 8-Grasses (Gramineae), 9-Aster (Aster macrophyllus), lO-Bracken fern {Pteridium aquilinum), 11-Shrubs and seedlings, 12-Fallen green trees, 13-Raspberry {Rubus strigosus), 14-Miscellaneous. and that the juveniles are driven into the less pre- ferred blowdown. Acknowledgements I would like to thank Dr. William Brooks for advising me during the study and reading the manuscript, Dr. Paul Jensen, Dr. Dean Schneider, and Doyle McKey for reading the manuscript, and Sarah Miller for aiding in gathering vegetation data. A referee made helpful comments. Literature Cited Burt, W. H. 1957. Mammals of the Great Lakes Region. The University of Michigan Press, Ann Arbor. 246 pp. Burt, W. H. and R. Grossenheider. 1952. A Field Guide to Mammals. Houghton Mifflin Company, Boston. 284 pp. Calhoun, J. B. 1962. Population density and social pathology. Sci. Am. 206, 139-48. Cottam, C. and J. T. Curtis. 1956. The use of dis- tance measures in phytosocialogical sampling. Eco- logy, 37, 451-60. Gunderson, H. L. and J. R. Beer. 1953. The Mam- mals of Minnesota. University of Minnesota Press, Minneapolis. 190 pp. Saldier, R. M. F. S. 1965. The relationship be- tween agonistic behavior and population changes in the deermouse Peromyscus maniculatus (Wag- ner). J. Anim. Ecol. 34, 331-52. Roger A. Powell Department of Biology, University of Chicago, Chicago, Illinois 60637 Received November 15, 1971 Accepted July 12, 1972. 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 Ottawa Field-Naturalists' Club. Ot
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