Chemical similarity between historical and novel host plants promotes range and host expansion of the mountain pine beetle in a naïve host ecosystem
Article first published online: 30 OCT 2013
© 2013 The Authors. New Phytologist © 2013 New Phytologist Trust
Volume 201, Issue 3, pages 940–950, February 2014
How to Cite
Erbilgin, N., Ma, C., Whitehouse, C., Shan, B., Najar, A. and Evenden, M. (2014), Chemical similarity between historical and novel host plants promotes range and host expansion of the mountain pine beetle in a naïve host ecosystem. New Phytologist, 201: 940–950. doi: 10.1111/nph.12573
- Issue published online: 9 JAN 2014
- Article first published online: 30 OCT 2013
- Manuscript Accepted: 26 SEP 2013
- Manuscript Received: 1 JUL 2013
- Genome Alberta
- Genome BC
- Genome Canada
- Alberta Innovates
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- boreal forest;
- Dendroctonus ponderosae ;
- invasion biology;
- jack pine;
- Pinus banksiana
- Host plant secondary chemistry can have cascading impacts on host and range expansion of herbivorous insect populations.
- We investigated the role of host secondary compounds on pheromone production by the mountain pine beetle (Dendroctonus ponderosae) (MPB) and beetle attraction in response to a historical (lodgepole pine, Pinus contorta var. latifolia) and a novel (jack pine, Pinus banksiana) hosts, as pheromones regulate the host colonization process.
- Beetles emit the same pheromones from both hosts, but more trans-verbenol, the primary aggregation pheromone, was emitted by female beetles on the novel host. The phloem of the novel host contains more α-pinene, a secondary compound that is the precursor for trans-verbenol production in beetle, than the historical host. Beetle-induced emission of 3-carene, another secondary compound found in both hosts, was also higher from the novel host. Field tests showed that the addition of 3-carene to the pheromone mixture mimicking the aggregation pheromones produced from the two host species increased beetle capture.
- We conclude that chemical similarity between historical and novel hosts has facilitated host expansion of MPB in jack pine forests through the exploitation of common host secondary compounds for pheromone production and aggregation on the hosts. Furthermore, broods emerging from the novel host were larger in terms of body size.