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Mountain Pine Beetle: From Lessons Learned to Community-based Solutions Conference Proceedings

Philip Burton    
Bill Bourgeois    
Dan George    
Kathie Swift    
Doug Lewis    
Todd Redding et al.    
Dan Orcherton    
Gina Thomas    
R. Allan Powelson    
Kelly Osbourne    
Robert Parisotto    
Brad Hawkes    
Rene Alfaro    
Jodi Axelson    
Darin W. Brooks    
Craig DeLong    
Bruce Rogers    
Pat Teti    
Alan Vyse    
Harold Armieder    
Michaela Waterhouse    
Patrick Daigle    
Pierre Iachetti    
Christian St Pierre    
Alistair McCrone    
Kathy Martin    
Mark Drever    
Andrea R. Norris    
R. Scott McNay    
Randy Sulyma    
Joan Voller    
Viktor Brumovsky    
Don G. Morgan    
Andrew Fall    
Rob M. McCann    

Resumen

Outbreaks of mountain pine beetle are evaluated as a generic disturbance agent, and comparisons are made with other forest disturbances such as wildfire, windthrow, and logging. A useful basis for comparison is the degree of disruption to the overstorey, understorey, and forest floor layers. Clear differences are observed in the impacts of bark beetles, fire, and windthrow, but there is overlap with various harvesting systems. Insects are selective in terms of the species or size of tree that is killed; this selectivity varies with stand composition, stand structure, and outbreak stage. The mountain pine beetle functions as part of larger natural disturbance regimes in western North America, which vary with climate and forest type. Outbreaks of many different insects occur throughout western Canada, with the relative role of fire and insects differing among ecoregions and over time. Beetle-killed stands may facilitate extreme fire behaviour and may be more susceptible to future burning. Large expanses of dead or removed trees also result in altered soil water balance and stream flows, disposing some sites to mass movement or flooding. All disturbances generate heterogeneity, with much of the value to biodiversity and ecosystem recovery depending on residual structure and biological legacies. The capacity for unassisted recovery and the value of each stand to timber supply, carbon balance, and habitat needs in a landscape context are relevant when considering salvage logging or forest rehabilitation. The future role of forest pests is expected to fluctuate in response to changes in climate and the altered composition and structure of western forests.

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