By Arthur T. Bergerud, Michael W. Gratson
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Extra info for Adaptive Strategies and Population Ecology of Northern Grouse (v. 1 & 2)
BERGERUD Fig. 2. Density of advertising males at the capture sites (Mossop 1971, Zwickel et al. 1983). banded whenever possible. Hens with young broods were captured and marked to facilitate censuses, movement studies, and estimates of production and measurements of behavior. A majority of the hens were banded on Moresby from 1971 to 1976. Productivity was estimated by counting the number of chicks in broods in late July and August. These counts were made each year on Moresby, on Portland in 1972 and from 1974 to 1977, and on Stuart from 1975 to 1977.
3. Topography and vegetation cover on Moresby Island. Most male territories were adjacent to the highest hill on the island and were in preferred habitats of scattered Douglas fir and bedrock. 1 to 4 days of age. I quantified the interactions of each chick with its mirror image weekly from the age of 1 week to 2 months, by placing a mirror in the brood box for 5 minutes and recording the frequency of hard pecking and shadowboxing for all members of the brood (Theberge & Bendell 1980). In 1971 and 1972 approximately 26 males and 39 females resided on Moresby Island.
Comox Burn was stable. The high population, CC, had apparently been increasing since 1964 and then stabilized during the 2 years of this study. This increase was about 12% per year. The assumption was that, given the adult mortality rate typical of blue grouse (30-31%), sufficient numbers of birds of the "increasing stock" (70% in 1967) were present throughout the study to make the test of the null hypothesis valid. 2). A surplus of chicks over the number required for recruitment the next year was produced annually in blue grouse populations on Vancouver Island (Bendell 1955b, Zwickel 1965).