IUCN / SSC Cat Specialist Group - Digital Cat Library |
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| Lendrum, P.E.; Elbroch, L.M.; Quigley, H.; Thompson, D.J.; Jimenez, M.; Craighead, D. | |
| Home range characteristics of a subordinate predator: selection for refugia or prey availability? | |
| 2014 Conference Proceeding | |
Cougars (_Puma concolor_) are described as "habitat generalists", but little is known about which ecological factors drive their home range selection, particularly in the presence of dominant competitors (i.e. wolves, _Canis lupus_). We tracked cougars using VHF (2001 to 2005) and GPS (2006 to 2011) technology in the Southern Yellowstone Ecosystem (SYE) in northwestern Wyoming, USA. We tested whether data type (VHF vs. GPS), cougar sex, access to forests (refugia), or prey availability explained the size of 50% and 95% kernel density estimator (KDE) home ranges. Second, we quantified attributes of cougar home ranges and tested whether they were different from attributes of the overall study area, to address the ecological question: Do cougars select home ranges based on the availability of refugia, prey availability, or some combination of the two? Cougar sex and data type proved significant predictors of home range size for both 95% and 50% KDEs, and the amount of forest partly explained the size of 50% KDEs. Cougar home ranges derived from VHF data were 1.4_]1.9 times larger than home ranges derived from GPS data, however, home range attributes determined from VHF and GPS data were remarkably equivalent. Female cougars selected home ranges with higher hunt opportunity than males, and higher than expected when compared to the mean value of the study area, supporting the long_]standing assumption that females primarily select home ranges with suitable prey to sustain themselves and their dependent young. All cougars selected home ranges further from known wolf packs, providing evidence for newly established competition between resident cougars and recolonizing wolves, but did not select home ranges with greater access to landscape refugia. Our results provided evidence that cougars in the SYE select home ranges that provide high prey availability and a spatial buffer that mitigates potential conflicts with a dominant competitor. |
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