Graduate Thesis Or Dissertation

 

Daily activity patterns, survival, and movements of red tree voles (Arborimus longicaudus) in western Oregon Public Deposited

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  • We radiocollared a sample of 61 red tree voles in Douglas County, Oregon and monitored their movements to determine daily, seasonal, and sexual differences in behavior and home range attributes. We also collected information on nest attributes, survival, and dispersal of the radiocollared voles. Individual voles were monitored for periods ranging from 8-307 days ( x̄ ± SE = 75.4 ± 8.2). Of the 52 voles used in the analysis of home range size, 20 (6 males, 14 females) occupied a single nest and adjacent foraging trees that had interconnecting branch pathways with the nest tree. The other 32 voles (16 males, 16 females) occupied ranges that included 2-6 nest trees that were spaced 4-131 m apart and 7 of these voles (6 males, 1 female) frequently moved between nest trees throughout the sampling period. Estimates of mean home range size were 1,378 ± 333 m² for the 100% Minimum Convex Polygon method and 1,599 ± 327 m² for a new method that we referred to as the Crown Area Polygon. Little of the variation in home range size was explained by the sex or age of voles or by forest age. Two radiocollared juveniles that dispersed from their natal nests moved straight-line distances of 50 and 75 m, respectively, before settling in new nests.
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