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Abstract
Display activity, lek population size, and day‐time movements of capercaillie (Tetrao urogallus) on 3 experimentally logged leks were compared with 2 untreated control leks in a coniferous area in southeastern Norway, during 1980–87. The treatments were clearcut‐ting and thinning of lek areas and parts of surrounding day territories. We recorded considerable changes in display activity and day territories, but the demographic responses were less obvious. A negative effect on population size was recorded only at the most thoroughly logged lek. The findings indicate that large clearcuts (>20 ha) and thorough thinnings (leaving <4–500 stems/ha) promote solitary display, which may have long‐term evolutionary and ecological consequences.
