By Arthur T. Bergerud, Michael W. Gratson
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Additional resources for Adaptive Strategies and Population Ecology of Northern Grouse (v. 1 & 2)
Obviously, test situations will never be exactly like natural ones; however, there is ample evidence that they can usually be used to predict what will happen in the natural situation. One feature of our results that made artifact unlikely was the number and kind of observations that led to the same conclusion. Sixteen measures of behavior, albeit not independent of one another, contrasted the increasing, high-density population with the others. Significantly, the six or seven that could be interpreted with some certainty as agonistic behavior likewise contrasted the increasing stock with the others.
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. At that time, many of the hens had not nested, suggesting a female- DEMOGRAPHY AND BEHAVIOR OF BLUE GROUSE 35 dominated, monogamous system. To test this hypothesis, 20 males and five replacement yearlings were removed from their territories for the Moresby population in 1976.
2. Breeding densities of blue grouse from three study populations (CC, MQL, CB) on Vancouver Island, 1962-68. The numerical trends were obtained by incorporating the results of previous study (Zwickel 1965, 1967) at the two low-density areas and of a roadside sample from hunters at the high-density area. This showed MQL in a slow decline (about 10% per year), which appeared to have begun in 1964. Comox Burn was stable. The high population, CC, had apparently been increasing since 1964 and then stabilized during the 2 years of this study.
Adaptive Strategies and Population Ecology of Northern Grouse (v. 1 & 2) by Arthur T. Bergerud, Michael W. Gratson