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By Arthur T. Bergerud, Michael W. Gratson

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Additional info for Adaptive Strategies and Population Ecology of Northern Grouse (v. 1 & 2)

Example text

3). The pattern of chick disappearance on these areas was basically the same—an initial high mortality until 10 days of age was followed by a slower, more constant loss. The difference in chick survival between the increasing CC and the declining MQL populations at 50-70 days was significant in both years. Moreover, within populations there was no significant difference in brood size between years. 1 Spontaneous behavior Hooting is the territorial song of the male blue grouse and the most obvious evidence of territorial behavior.

Survival of females was determined only on Moresby; 13 CC females (65%), 10 CB females (50%), and 16 of 20 MQ hens (80%) were alive in 1971. Yearlings did as well as adults on Moresby; 52% survived (14/27) compared to 55% survival of adults (51/93). 2). Males generally established territories in open, Douglas fir forests, usually on elevated bedrock sites with little vegetation at ground level on all three islands. On Moresby, CC males scattered the least from the release sites, settled closer to other males, and had smaller territories than did either MQ or CB stock (Figs.

In addition, because the founders and their progeny were unable to disperse, I compared their behavior with those of birds at the original capture sites on Vancouver Island, which were of course free to disperse. This was the first blue grouse study to control dispersal as a demographic variable. Redfield (1975) argued in favor of an experimental approach to the study of dispersal and genetics in the regulation of blue grouse numbers in which plant succession was held constant while bird densities changed.

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