Common Cerambycid Pheromone components as attractants for Longhorn Beetles (Cerambycidae) breeding in ephemeral oak substrates in Northern Europe

Journal article


Molander, M., Winde, I., Burman, J., Nyabuga, F., Lindblom, T., Hanks, L., Millar, J. and Larsson, M. 2019. Common Cerambycid Pheromone components as attractants for Longhorn Beetles (Cerambycidae) breeding in ephemeral oak substrates in Northern Europe. Journal of Chemical Ecology. https://doi.org/10.1007/s10886-019-01082-4
AuthorsMolander, M., Winde, I., Burman, J., Nyabuga, F., Lindblom, T., Hanks, L., Millar, J. and Larsson, M.
Abstract

Longhorn beetles are ecologically important insects in forest ecosystems as decomposers of woody substrates, microhabitat engineers, and as components of forest food webs. These species can be greatly affected both positively and negatively by modern forestry management practices, and should be monitored accordingly.

Through headspace sampling, coupled gas chromatography-electroantennography, gas chromatography-mass spectrometry, and field bioassays, we identified two compounds, 2-methyl-1-butanol and 3-hydroxy-2-hexanone, that constitute aggregation-sex pheromone attractants of three cerambycid species which breed primarily in different types of fresh, recently dead oak wood in Northern Europe: Pyrrhidium sanguineum (L.), Phymatodes alni ssp. alni (L.), and Phymatodes testaceus (L.) (Cerambycinae: Callidiini). Analyses of headspace volatiles collected from live insects indicated that the male-produced aggregation-sex pheromone of P. sanguineum is a 1–15:100 blend of (R)-2-methyl-1-butanol and (R)-3-hydroxy-2-hexanone, whereas the corresponding ratios for P. alni were 70–110:100. In field bioassays, adult P. sanguineum and P. alni were significantly attracted to multiple blends with varying ratios of the two compounds. When tested individually, the compounds were minimally attractive. In contrast, adult P. testaceus exhibited nonspecific attraction to both of the individual compounds and to different blends, despite the hydroxyketone not being part of its pheromone, which consists of (R)-2-methyl-1-butanol alone.

Overall, our results suggest that a blend of 50:100 of racemic 2-methyl-1-butanol and 3-hydroxy-2-hexanone is appropriate for parallel, cost-efficient pheromone-based monitoring of all three species. In particular, these species could serve as useful indicators of how modern forestry practices affect a whole guild of saproxylic insects that require ephemeral deadwood substrates for successful breeding.

KeywordsSemiochemical; (R)-2-Methyl-1-butanol; (R)-3-Hydroxy-2-hexanone; monitoring; biodiversity; red list
Year2019
JournalJournal of Chemical Ecology
PublisherSpringer
ISSN0098-0331
Digital Object Identifier (DOI)https://doi.org/10.1007/s10886-019-01082-4
Publication dates
Online28 Jun 2019
Publication process dates
Deposited03 Jul 2019
Accepted12 Jun 2019
Publisher's version
Output statusPublished
Additional information

This is an open access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/

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https://repository.canterbury.ac.uk/item/89023/common-cerambycid-pheromone-components-as-attractants-for-longhorn-beetles-cerambycidae-breeding-in-ephemeral-oak-substrates-in-northern-europe

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