ABSTR•CT.--Totalobserved ranges of 24 groups of Red-cockaded Woodpeckers (Picoides borealis) varied from 34 to 225 ha and averaged 86.9 ha.Groups defended portions of these ranges from adjacent groups year-round.Home ranges were derived from total observed ranges by subtracting extraterritorial areas and areas receiving limited use.The percentage of year-round home-range boundaries determined by intergroup conflicts varied from 0% to 54% and averaged 23.6%.Year-round home ranges averaged 70.3 ha and varied from 30 to 195 ha.The portion of year-round home ranges used in all sampling periods varied from 15% to 65% and averaged 30.5%.The amount of potential foraging habitat per group for all groups within 2,000 m of a study group's colony, a measure of population density relative to available habitat, accounted for 70% of the variation in size of year-round home ranges (P < 0.0001).Various measures of group size and habitat quality were weakly related to size of year-round home ranges.Measures of group size and population density together accounted for 80% of the variation in size of year-round home ranges.
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Hooper et al. (1982) studied this question.