The Impact of Phloem Nutrients on Overwintering Mountain Pine Beetles and Their Fungal Symbionts

Author
Goodsman, Devin W. · Erbilgin, Nadir · Lieffers, Victor J.
Published June 2012
Journal Environmental Entomology
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Abstract

In the low nutrient environment of conifer bark, subcortical beetles often carry symbiotic fungi that concentrate nutrients in host tissues. Although bark beetles are known to benefit from these symbioses, whether this is because they survive better in nutrient-rich phloem is unknown. After manipulating phloem nutrition by fertilizing lodgepole pine trees (Pinus contorta Douglas var. latifolia), we found bolts from fertilized trees to contain more living individuals, and especially more pupae and teneral adults than bolts from unfertilized trees at our southern site. At our northern site, we found that a larger proportion of mountain pine beetle (Dendroctonus ponderosae Hopkins) larvae built pupal chambers in bolts from fertilized trees than in bolts from unfertilized trees. The symbiotic fungi of the mountain pine beetle also responded to fertilization. Two mutualistic fungi of bark beetles, Grosmannia clavigera (Rob.-Jeffr. & R. W. Davidson) Zipfel, Z. W. de Beer, & M. J. Wingf. and Leptographium longiclavatum Lee, S., J. J. Kim, & C. Breuil, doubled the nitrogen concentrations near the point of infection in the phloem of fertilized trees. These fungi were less capable of concentrating nitrogen in unfertilized trees. Thus, the fungal symbionts of mountain pine beetle enhance phloem nutrition and likely mediate the beneficial effects of fertilization on the survival and development of mountain pine beetle larvae.

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Details

Title
The Impact of Phloem Nutrients on Overwintering Mountain Pine Beetles and Their Fungal Symbionts
Author
Goodsman, Devin W. · Erbilgin, Nadir · Lieffers, Victor J.
Year
2012
Journal
Environmental Entomology
Document Type
Research article
Language
eng
Subjects
Blue-stain · Dendroctonus · Nitrogen · Pine · Symbiosis
This is Version 1 of this record. We added this version on June 10, 2012. This version is based on an original data import from IngentaConnect.com.