期刊
JOURNAL OF MAMMALOGY
卷 87, 期 3, 页码 531-538出版社
OXFORD UNIV PRESS INC
DOI: 10.1644/05-MAMM-A-259R1.1
关键词
bighorn sheep; connectivity; habitat; movement; Ovis canadensis; resource selection
类别
Species that exist in naturally fragmented subpopulations can maintain long-term viability through interpopulation connectivity and recolonization of suitable habitat. We used radiotelemetry to study movements of 3 herds of bighorn sheep (Ovis canadensis) that recently colonized previously unoccupied parts of western Montana. These herds also provided a unique opportunity to compare resource-selection patterns in newly colonized habitats, and we used logistic regression in a global information system framework to generate predictive models for females in each herd. We detected relatively long (19- to 33-km) extra-home range movements by males in all 3 herds, and connectivity with nearby bighorn and domestic sheep herds. An information-theoretic approach to model selection revealed greater differences in resource selection among herds than anticipated. Initial evaluation of resource-selection models by resubstituting data showed excellent predictive accuracy (P <= 0.002), but testing models across sites gave mixed results, and in many cases, poor fit (0.001 <= P <= 0.960). High vagility of males and variability in resource selection by females suggests increased potential for future recolonization and connectivity.
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