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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)

Sample text

All three areas had been logged, followed by slash burning and wildfires, and replanted with Douglas fir. The demographic history of the three source populations is shown (Fig. 2). In contrast to the capture sites, the release sites were covered with an older growth of Douglas fir. 5 m dbh and over 40 m in height. Sections of Moresby Island had been selectively logged but little regeneration had occurred. There were open forests without shrubs on all the islands, where soils were thin and bedrock protruded.

H. MOSSOP density areas were very similar. However, at the high, increasing area, significantly more birds either moved away or stopped singing. In addition, whereas at the two low-density areas 30-35 % of males either increased hooting or gave the "feather spread display," at the high, increasing area this never occurred. Another social signal of the blue grouse is a loud wing flutter, which may be made upon alighting. Bendell and Elliott (1967) described it as the "flutter flight" and suggested it was a territorial signal with significance comparable to song.

Listening stations were established at 100-m intervals along sections of logging roads to supplement total search and to allow a check of the density of territorial males over a larger area. Effective width of these transects was 100 m either side of the road. Stations were visited during May and June between 0530-0900 and 2000-2200 hours, when birds displayed territorial song. Overall, each transect averaged ten listening stations and was covered at least three times per year. After reaching each station and pausing for 10 minutes, a series of female blue grouse calls was broadcast.

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