Abstract
Locations of five drumming male ruffed grouse (Bonasa umbellus) were recorded with an automatic radiotracking system on the Cedar Creek Natural History Area in east-central Minnesota during spring 1970. Overlap of the ranges of 2 adjacent males was found in 17 of 23 weeks, and mutually occupied areas varied from 0 to 3.21 ha (anti chi = 0.88). Size of the overlapping area was negatively correlated with distance between activity centers and positively correlated with mean size of the two neighbors' ranges. A strong tendency was found for differential use of overlapping 0.026-ha gridsquares. Male grouse usually avoided their neighbor's side of an artificial boundary line, suggesting that real territorial boundaries may have existed. Values of an index of interaction potential (based on locations greater than or equal to 2 minutes apart) showed that adjacent males could have displayed at close quarters or fought in most (78 percent) cases. One of two vacated territories was reoccupied by an unmarked juvenile male.
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