Facilitation in bark beetles: endemic mountain pine beetle gets a helping hand

Authors

  • Gregory D. Smith,

    Corresponding author
    1. University of Northern British Columbia, 3333 University Way, Prince George, British Columbia V2N 4Z9, Canada
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    • Present address: Natural Resources Canada, Canadian Forest Service, 506 W. Burnside Road, Victoria, British Columbia V8Z 1M5, Canada.

  • Allan L. Carroll,

    1. University of British Columbia, 2424 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
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  • B. Staffan Lindgren

    1. University of Northern British Columbia, 3333 University Way, Prince George, British Columbia V2N 4Z9, Canada
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Gregory D. Smith. Tel: +1 250 363 0697; fax: +1 250 363 0775; e-mail: greg.smith@nrcan.gc.ca

Abstract

  • 1Endemic populations of the bark beetle Dendroctonus ponderosae attack weakened lodgepole pine (Pinus contorta var. latifolia) trees that are often previously infested by other bark beetle species, such as Pseudips mexicanus.
  • 2The effect of interactions on D. ponderosae was assessed by examining host selection and productivity of D. ponderosae in trees containing P. mexicanus and trees infested solely by D. ponderosae.
  • 3The findings obtained show that D. ponderosae attacked hosts previously occupied by P. mexicanus at greater densities, and offspring emerged earlier compared with hosts infested by D. ponderosae alone. Additionally, D. ponderosae larvae in P. mexicanus-infested trees were found to require a significantly lower amount of resource to complete development with no loss in size.
  • 4The presence of P. mexicanus may affect host condition, improving the subcortical environment for endemic D. ponderosae, ultimately aiding in population maintenance at low levels. Hosts in this state should be preferentially attacked by D. ponderosae.

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