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Mountain pine beetle spread in forests with varying host resistance

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  • Brush, Micah
  • Lewis, Mark A.

Abstract

In the last few decades, mountain pine beetle (MPB) have spread into novel regions in Canada. An important aspect seldom captured in models of MPB spread is host resistance. Lodgepole pine, the predominant host of MPB, varies in resistance across the landscape. There is evidence for a genetic component of resistance, as well as evidence that hosts in areas where MPB has not been present historically are at risk of increased susceptibility. In addition to the spatially varying resistance of the primary host species, the eastward spread of MPB has brought them into jack pine forests. Host resistance in jack pine remains uncertain, but experiments indicate jack pine could be a suitable host. We develop a model of pine beetle spread that links pine beetle population dynamics and forest structure and resistance. We find that beetle outbreaks in the model are characterized by large transient outbreaks that move through the forest. We show how the speed of these outbreaks changes with host resistance and find that biologically plausible values for host resistance are able to stop the wave from advancing. We also find that near the threshold of resistance where the wave is able to advance, small changes in host resistance dramatically decrease the severity of the outbreak. These results indicate that planting trees selected for higher MPB resistance on the landscape may be able to slow or even stop the local spread of MPB. In terms of further eastward spread, our results indicate future outbreaks may move more quickly and be more severe if novel lodgepole pine hosts are indeed more susceptible to beetle attacks, although more research is needed into the susceptibility of jack pine.

Suggested Citation

  • Brush, Micah & Lewis, Mark A., 2025. "Mountain pine beetle spread in forests with varying host resistance," Ecological Modelling, Elsevier, vol. 500(C).
    • Handle: RePEc:eee:ecomod:v:500:y:2025:i:c:s0304380024002990
    DOI: 10.1016/j.ecolmodel.2024.110911
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    References listed on IDEAS

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    1. W. A. Kurz & C. C. Dymond & G. Stinson & G. J. Rampley & E. T. Neilson & A. L. Carroll & T. Ebata & L. Safranyik, 2008. "Mountain pine beetle and forest carbon feedback to climate change," Nature, Nature, vol. 452(7190), pages 987-990, April.
    2. Srivastava, Vivek & Carroll, Allan L., 2023. "Dynamic distribution modelling using a native invasive species, the mountain pine beetle," Ecological Modelling, Elsevier, vol. 482(C).
    3. Powell, James A. & Bentz, Barbara J., 2014. "Phenology and density-dependent dispersal predict patterns of mountain pine beetle (Dendroctonus ponderosae) impact," Ecological Modelling, Elsevier, vol. 273(C), pages 173-185.
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