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Author (up) Senf, C.; Campbell, E.M.; Pflugmacher, D.; Wulder, M.A.; Hostert, P. doi  openurl
  Title A multi-scale analysis of western spruce budworm outbreak dynamics Type Journal Article
  Year 2017 Publication Landscape Ecology Abbreviated Journal  
  Volume 32 Issue 3 Pages 501-514  
  Keywords Disturbance, Budworm, Western spruce budworm, Defoliation, Landsat, British Columbia  
  Abstract Context Forest insect outbreaks are influenced by ecological processes operating at multiple spatial scales, including host-insect interactions within stands

and across landscapes that are modified by regional-scale variations in climate. These drivers of outbreak dynamics are not well understood for the western

spruce budworm, a defoliator that is native to forests of western North America.

Objectives Our aim was to assess how processes across multiple spatial scales drive western spruce budworm outbreak dynamics. Our objective was to assess the relative importance and influence of a set of factors covering the stand, landscape, and regional scales for explaining spatiotemporal outbreak patterns

in British Columbia, Canada.

Methods We used generalized linear mixed effect models within a multi-model interference framework to relate annual budworm infestation mapped from Landsat time series (1996–2012) to sets of stand-, landscape-, and regional-scale factors derived from forest inventory data, GIS analyses, and climate models.

Results Outbreak patterns were explained well by our model ( R2 = 93%). The most important predictors of infestation probability were the proximity to

infestations in the previous year, landscape-scale host abundance, and dry autumn conditions. While stand characteristics were overall less important predictors,

we did find infestations were more likely amongst pure Douglas-fir stands with low site indices and high crown closure.

Conclusions Our findings add to growing empirical evidence that insect outbreak dynamics are driven by multi-scaled processes. Forest management plan-

ning to mitigate the impacts of budworm outbreaks should thus consider landscape- and regional-scale factors in addition to stand-scale factors.
 
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  Call Number geomatics @ Serial 482  
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