Skip to Main Content
Traumatic resin ducts as indicators of bark beetle outbreaksAuthor(s): R. Justin DeRose; Matthew F. Bekker; James N. Long
Source: Canadian Journal of Forest Research. 47: 1168-1174.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
Download Publication (3.0 MB)
Related Research Highlights Traumatic resin ducts indicate past beetle outbreaks
DescriptionThe formation of traumatic resin ducts (TRDs) represents an important induced defense in woody plants that enhances oleoresin production and flow in response to environmental perturbations. In some genera (Pinus), resin ducts are copious and conspicuous; however, in others (Picea), resin ducts are relatively rare. The occurrence and strength of resin ducts, in particular TRDs, in annually resolved rings could be used to reconstruct mechanical damage associated with natural disturbances. We analyzed tree-ring data from paired live and dead Engelmann spruce (Picea engelmannii Parry ex Engelm.) that recently experienced a spruce beetle outbreak. The presence of TRDs, defined as resin ducts aligned tangentially and arranged compactly, indicated mechanical damage associated with epidemic spruce beetle (Dendroctonus rufipennis (Kirby)) populations. TRD prevalence during the outbreak was significantly higher than over tree lifespans. All other metrics characterizing tree vigor (diameter, age, ring width, and basal area increment) were not significantly different between live and dead trees, suggesting that the inherent capability to produce TRDs that can "pitch out" attacking spruce beetles could be the primary mechanism by which Engelmann spruce survived the outbreak. Because TRD production in our Engelmann spruce was exceedingly rare, this discovery represents a new line of tree-ring-based evidence that can be used to reconstruct other spruce beetle outbreaks.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationDeRose, R. Justin; Bekker, Matthew F.; Long, James N. 2017. Traumatic resin ducts as indicators of bark beetle outbreaks. Canadian Journal of Forest Research. 47: 1168-1174.
Keywordsbark beetles, dendrochronology, Dendroctonus rufipennis, disturbance, resin canals, resin ducts, traumatic resin ducts
- Physical and chemical characteristics of blue and Engelmann spruce relative to spruce beetle host selection and colonization
- Spectral evidence of early-stage spruce beetle infestation in Engelmann spruce
- Drought-driven disturbance history characterizes a southern Rocky Mountain subalpine forest
XML: View XML