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)
In fact, the density of blue grouse breeding on the area at the beginning of the study was about as high as has been recorded. It seems most likely that the population underwent an increase which ended in 1968. Because breeders were dying on the area at about 30% annually, I feel confident that for the purpose of the test, most of the birds on the area during our field work would be of the "increasing stock," if such a type existed. 2 Aggressive behavior Interpretations of animal behavior are more difficult to defend.
Through mortality by environmental variables is such a hypothesis. Models of regulation through competition for some commodity (Nicholson 1933, Lack 1954), or through mortality by such environmental hazards as weather and disease, must at a minimum be modified to accept the possibility that significant variations may occur between different breeding stocks. These may seriously alter the way extrinsic factors interact with populations. The second contribution I had hoped to make with this work was to test for differences in aggressive behavior among breeding stocks with different numerical trends.
Two basic elements of the behavior were recognized: an attempt by the female to lead us away, and an intimidating rush toward us. Again the two low areas resembled each other; at the high area there was significantly less leading and rushing (Fig. 10). The response of hens during leading and rushing was given a rating on a predetermined scale. Three categories were devised for each display according to the nearness of approach, degree of feather spread, amount of vocalization, and general vigor of the response.
Adaptive Strategies and Population Ecology of Northern Grouse (v. 1 & 2) by Arthur T. Bergerud, Michael W. Gratson