Effect of management on the spatial spread of mountain pine beetle (Dendroctonus ponderosae) in Banff National Park |
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| Authors: | M Kurtis Trzcinski Mary L Reid |
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| Institution: | aParks Canada, Banff National Park, Banff, Canada B3H 4J1;bDepartment of Biological Sciences, University of Calgary, 2500 University Dr. N.W., Calgary, Alberta, Canada T2N 1N4 |
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| Abstract: | To evaluate control measures, the spread of mountain pine beetles, Dendroctonus ponderosae, in management and monitoring regions in Banff National Park was analyzed for years 1997 to 2004. The Park allowed mountain pine beetles to follow their natural course in a monitoring zone (74,041 ha), whereas in a management zone (45,997 ha) an extensive eradication program was established in 2001 which included baiting mountain pine beetles and cutting and burning all colonized trees. We used data collected from an annual aerial survey and the geo-referenced location of trees that were cut and removed to assess if the area colonized and the spatial extent of mountain pine beetles differed between the two zones. After 4 years, the control measures did not significantly affect the area colonized by mountain pine beetles, and in 2004 mountain pine beetles were still expanding in both zones, although at a slow rate (1.23 ha per year). The spatial extent and the rate at which 500 m × 500 m cells (25 ha) were colonized were much reduced in the management zone. Thus, the management program appeared to have reduced the success of long distance movement as measured by colonizing new 25 ha cells, but short distance dispersal remained successful as indicated by the continued increase in area colonized. The effectiveness of control measures was probably limited by the number of colonized trees that were missed and by survival rates determined by other untested factors. |
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| Keywords: | Bark beetle Scolytinae Dendroctonus Lodgepole pine Pinus contorta Aerial survey Landscape management Direct control |
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