Complex Effects of Human-Impacted Landscapes on the Spatial Patterns of Mammalian Carnivores

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dc.contributor.author Heim, Nicole Alexis
dc.date.accessioned 2015-05-01T22:05:53Z
dc.date.available 2015-05-01T22:05:53Z
dc.date.copyright 2015 en_US
dc.date.issued 2015-05-01
dc.identifier.uri http://hdl.handle.net/1828/6116
dc.description.abstract In the face of an expanding global human footprint, mammalian carnivores have become vulnerable to the effects of large-scale landscape change. Throughout North America, wide-ranging terrestrial carnivores have experienced significant species declines and range retractions. Understanding the complex and interacting effects of human-caused habitat disturbance on highly mobile species remains an ongoing challenge for ecologists. To address these challenges, studies commonly select a focal species to examine the adverse effects of human disturbance. Due to the paucity of multi-species study, little is yet known about the relative role interspecific interactions play within communities of carnivores in human-altered systems. In an effort to address this knowledge gap, I examined occurrence patterns of one species known to be sensitive to human disturbance – the wolverine – and compared occurrence patterns among multiple carnivores across a gradient of increasing human land use within a rugged and heterogeneous landscape in the Canadian Rocky Mountains of Alberta. I surveyed carnivore occurrence by combining remote camera trapping and non-invasive genetic tagging. Using a systematic grid based design, medium to large sized carnivores were detected over an area approximately 15,000km2. Consistent with the literature, I found wolverines to be less likely to occur outside of protected areas boundaries and with increasing human-caused landscape disturbance. Contrary to recent climate-focused hypotheses, the spatial pattern of wolverine occurrence was best explained by cumulative effects. When modeling multiple carnivore occurrence across this spatial gradient of human land use, no generality in response was observed. However, a consistent and distinct dissimilarity in response to natural and anthropogenic landscape features was found between wolverine and coyote. The patterns of occurrence led me to infer that habitat condition in the more human-altered systems found along eastern slopes of the Canadian Rocky Mountains is less suitable for some more sensitive species and benefits more human-adapted species. I further hypothesized that an indirect and additive effect of human disturbance is increased interspecific competition between co-occurring carnivores that differentially respond to changes in habitat condition. My results emphasize that by broadening our scope to investigate both single and multiple species, ecologists and managers may better understand the full suite of factors influencing current and future distribution patterns. en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.rights.uri http://creativecommons.org/publicdomain/zero/1.0/ *
dc.subject wolverine en_US
dc.subject carnivores en_US
dc.subject occupancy en_US
dc.subject Alberta en_US
dc.subject scale en_US
dc.subject non-invasive en_US
dc.subject remote camera trapping en_US
dc.subject genetic tagging en_US
dc.subject spatial en_US
dc.subject Canadian Rocky Mountains en_US
dc.title Complex Effects of Human-Impacted Landscapes on the Spatial Patterns of Mammalian Carnivores en_US
dc.type Thesis en_US
dc.contributor.supervisor Volpe, John
dc.contributor.supervisor Fisher, Jason Thomas
dc.degree.department School of Environmental Studies en_US
dc.degree.level Master of Science M.Sc. en_US
dc.description.scholarlevel Graduate en_US

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