Mitigating the Effects of Human Activity on Grizzly Bears (Ursus arctos) in Southwestern Alberta.

• Main Author: Braid, Andrew CR
• Other Authors: Dr. Scott Nielsen (Department of Renewable Resources), Dr. Doug Manzer (Alberta Conservation Association), Dr. Simon Landhausser (Department of Renewable Resources), Dr. Ellen Macdonald (Department of Renewable Resources)
• Format: Thesis
• Language: English
• Published: University of Alberta. Department of Renewable Resources. 2015
• Subjects: envir; geo; Ursus arctos
• Online Access: http://hdl.handle.net/10402/era.40597

Specialization: Conservation Biology Degree: Master of Science Abstract: Anthropogenic habitat loss and alteration, as well as human-caused mortalities associated with increasing access, threaten grizzly bear populations across much of their North American range. This research investigates strategies for mitigating the negative effects of human activities on grizzly bears in southwestern Alberta. First, an optimization approach was used to prioritize sites for both protection and restriction while also considering landscape composition. Seasonal habitats where bears forage were balanced against proximity to roads, which are associated with mortality risk, to identify priority source- (high quality, low risk) and sink-like (high quality, high risk) habitats. Most sink-like sites (63%) were associated with unimproved roads or truck trails and are the best candidates for decommissioning and restoration efforts. Approximately 75% of priority source-like sites are currently unprotected, and overlap between protected areas and source-like sites was geographically biased. Second, the viability of using wildlife habitat enhancements to increase local food supply for grizzly bears in clearcuts was assessed. Specifically, I conducted planting trials of seedlings (plugs) for three important late-season fruiting shrubs and monitored their survival and growth over two growing seasons. The effects of soil nutrient amendments, exclosures, initial seedling condition, and environmental factors (elevation and terrain) on seedling growth were considered. A. alnifolia had the highest survival rate, although may not be as effective as S. canadensis and V. membranaceum in the long term due to browse preferences. Soil nutrient amendments reduced survival rates, whereas exclosures increased survival rates. Survival rates for S. canadensis and A. alnifolia along elevation gradients were inconsistent with expected niche spaces for both species, suggesting that knowledge of their natural niche spaces along the elevation gradient alone may ...