. The Canadian field-naturalist. Natural history; Sciences naturelles. !Z7 Figure 5. Ilium process of (a) Greater Praire Chicken (b) and (c) Heath Hen and (d) Northern Sharp-tailed Grouse. The speed with which change took place in the mor- phology of the Manitoulin population over time was perhaps largely due to the fact that "Prairie" Grouse are lek species. The particular bird that succeeds in becom- ing the alpha male in the hierarchy of dominance on a lek would consummate most of the matings. His genes would dominate in the subsequent year class. The absence of male Prairie Chick
. The Canadian field-naturalist. Natural history; Sciences naturelles. !Z7 Figure 5. Ilium process of (a) Greater Praire Chicken (b) and (c) Heath Hen and (d) Northern Sharp-tailed Grouse. The speed with which change took place in the mor- phology of the Manitoulin population over time was perhaps largely due to the fact that "Prairie" Grouse are lek species. The particular bird that succeeds in becom- ing the alpha male in the hierarchy of dominance on a lek would consummate most of the matings. His genes would dominate in the subsequent year class. The absence of male Prairie Chickens on the Airport lek in 1962 and the presence of 10 male Prairie Sharp-tailed Grouse would have had a profound effect on the 1962- 1963 year class. It is perhaps not surprising that Guild (1997*) saw 50 Sharp-tailed Grouse there on 19 April 1997. J. Iron (personal communication) saw 75-100 on 15 April 2000, 30 on 12 April 2003 and 60 Sharp-tailed Grouse there on 11 April 2004. Those observers made no mention of Prairie Chickens or hybrids. Being skilled naturalists, they are unlikely to have missed them. Note: The extinct Heath Hen (Tympanuchus c. cupi- do) is of interest in that its ilium process does not proj- ect as far as that of the Greater Prairie Chicken (Tym-. 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. Ottawa, Ottawa Field-Naturalists' Club
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