Western Pine Beetle Populations in Arizona and California Differ in the Composition of Their Aggregation Pheromones

Deepa S. Pureswaran, Richard Hofstetter, Brian T. Sullivan, Amanda M. Grady, Cavell Brownie

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We compared pheromone production and response for populations of western pine beetle, Dendroctonus brevicomis LeConte, from sites in northern Arizona and northern California. Volatiles were collected from individuals of both sexes that had mined as a pair in a Pinus ponderosa log for 1 d, and they were subsequently analyzed by gas chromatography coupled to mass-spectrometry. Principal component analysis of quantities of Dendroctonus pheromone components indicated strong site-associated clustering of blend composition for females but not males. Much of the clustering in females evidently was due to differences in the production of endo- and exo-brevicomin, which occurred in average ratios of 0.1:1 and 19:1 for populations in the California and Arizona sites, respectively. In the California site, exo- was better than endo-brevicomin in enhancing trap catches of both sexes to lures containing the host-tree odor α-pinene and the male-produced aggregation pheromone component frontalin. In an identical test in the Arizona site, endo- was a better adjuvant than exo-brevicomin for male attraction, whereas females did not show a significant preference. At neither location were the isomers antagonistic to one another in activity. Thus, one aggregation pheromone has apparently diverged between these populations, concurrent with published evidence that D. brevicomis on either side of the Great Basin are genetically distinct and are possibly different species. Furthermore, production of and response to the isomers of brevicomin by flying Dendroctonus frontalis Zimmermann in the Arizona site were similar to those of sympatric D. brevicomis. This interspecific signal overlap is likely sustainable since joint species mass-attacks may assist both species in overcoming host defenses, thereby increasing host availability.

Original languageEnglish (US)
Pages (from-to)1-10
Number of pages10
JournalJournal of Chemical Ecology
DOIs
StateAccepted/In press - Apr 28 2016

Fingerprint

Dendroctonus brevicomis
aggregation pheromone
aggregation pheromones
Pheromones
Beetles
beetle
Agglomeration
pheromone
Chemical analysis
pheromones
Population
isomers
Isomers
Dendroctonus
Cluster Analysis
Dendroctonus frontalis
Pinus ponderosa
odor
gender
principal component analysis

Keywords

  • Character displacement
  • Geographic variation
  • Interspecific attraction
  • Pheromone
  • Scolytinae
  • Southern pine beetle
  • Western pine beetle

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Biochemistry

Cite this

Western Pine Beetle Populations in Arizona and California Differ in the Composition of Their Aggregation Pheromones. / Pureswaran, Deepa S.; Hofstetter, Richard; Sullivan, Brian T.; Grady, Amanda M.; Brownie, Cavell.

In: Journal of Chemical Ecology, 28.04.2016, p. 1-10.

Research output: Contribution to journalArticle

@article{a29a2a0f7df942c683f8858d0279d9d4,
title = "Western Pine Beetle Populations in Arizona and California Differ in the Composition of Their Aggregation Pheromones",
abstract = "We compared pheromone production and response for populations of western pine beetle, Dendroctonus brevicomis LeConte, from sites in northern Arizona and northern California. Volatiles were collected from individuals of both sexes that had mined as a pair in a Pinus ponderosa log for 1 d, and they were subsequently analyzed by gas chromatography coupled to mass-spectrometry. Principal component analysis of quantities of Dendroctonus pheromone components indicated strong site-associated clustering of blend composition for females but not males. Much of the clustering in females evidently was due to differences in the production of endo- and exo-brevicomin, which occurred in average ratios of 0.1:1 and 19:1 for populations in the California and Arizona sites, respectively. In the California site, exo- was better than endo-brevicomin in enhancing trap catches of both sexes to lures containing the host-tree odor α-pinene and the male-produced aggregation pheromone component frontalin. In an identical test in the Arizona site, endo- was a better adjuvant than exo-brevicomin for male attraction, whereas females did not show a significant preference. At neither location were the isomers antagonistic to one another in activity. Thus, one aggregation pheromone has apparently diverged between these populations, concurrent with published evidence that D. brevicomis on either side of the Great Basin are genetically distinct and are possibly different species. Furthermore, production of and response to the isomers of brevicomin by flying Dendroctonus frontalis Zimmermann in the Arizona site were similar to those of sympatric D. brevicomis. This interspecific signal overlap is likely sustainable since joint species mass-attacks may assist both species in overcoming host defenses, thereby increasing host availability.",
keywords = "Character displacement, Geographic variation, Interspecific attraction, Pheromone, Scolytinae, Southern pine beetle, Western pine beetle",
author = "Pureswaran, {Deepa S.} and Richard Hofstetter and Sullivan, {Brian T.} and Grady, {Amanda M.} and Cavell Brownie",
year = "2016",
month = "4",
day = "28",
doi = "10.1007/s10886-016-0696-9",
language = "English (US)",
pages = "1--10",
journal = "Journal of Chemical Ecology",
issn = "0098-0331",
publisher = "Springer New York",

}

TY - JOUR

T1 - Western Pine Beetle Populations in Arizona and California Differ in the Composition of Their Aggregation Pheromones

AU - Pureswaran, Deepa S.

AU - Hofstetter, Richard

AU - Sullivan, Brian T.

AU - Grady, Amanda M.

AU - Brownie, Cavell

PY - 2016/4/28

Y1 - 2016/4/28

N2 - We compared pheromone production and response for populations of western pine beetle, Dendroctonus brevicomis LeConte, from sites in northern Arizona and northern California. Volatiles were collected from individuals of both sexes that had mined as a pair in a Pinus ponderosa log for 1 d, and they were subsequently analyzed by gas chromatography coupled to mass-spectrometry. Principal component analysis of quantities of Dendroctonus pheromone components indicated strong site-associated clustering of blend composition for females but not males. Much of the clustering in females evidently was due to differences in the production of endo- and exo-brevicomin, which occurred in average ratios of 0.1:1 and 19:1 for populations in the California and Arizona sites, respectively. In the California site, exo- was better than endo-brevicomin in enhancing trap catches of both sexes to lures containing the host-tree odor α-pinene and the male-produced aggregation pheromone component frontalin. In an identical test in the Arizona site, endo- was a better adjuvant than exo-brevicomin for male attraction, whereas females did not show a significant preference. At neither location were the isomers antagonistic to one another in activity. Thus, one aggregation pheromone has apparently diverged between these populations, concurrent with published evidence that D. brevicomis on either side of the Great Basin are genetically distinct and are possibly different species. Furthermore, production of and response to the isomers of brevicomin by flying Dendroctonus frontalis Zimmermann in the Arizona site were similar to those of sympatric D. brevicomis. This interspecific signal overlap is likely sustainable since joint species mass-attacks may assist both species in overcoming host defenses, thereby increasing host availability.

AB - We compared pheromone production and response for populations of western pine beetle, Dendroctonus brevicomis LeConte, from sites in northern Arizona and northern California. Volatiles were collected from individuals of both sexes that had mined as a pair in a Pinus ponderosa log for 1 d, and they were subsequently analyzed by gas chromatography coupled to mass-spectrometry. Principal component analysis of quantities of Dendroctonus pheromone components indicated strong site-associated clustering of blend composition for females but not males. Much of the clustering in females evidently was due to differences in the production of endo- and exo-brevicomin, which occurred in average ratios of 0.1:1 and 19:1 for populations in the California and Arizona sites, respectively. In the California site, exo- was better than endo-brevicomin in enhancing trap catches of both sexes to lures containing the host-tree odor α-pinene and the male-produced aggregation pheromone component frontalin. In an identical test in the Arizona site, endo- was a better adjuvant than exo-brevicomin for male attraction, whereas females did not show a significant preference. At neither location were the isomers antagonistic to one another in activity. Thus, one aggregation pheromone has apparently diverged between these populations, concurrent with published evidence that D. brevicomis on either side of the Great Basin are genetically distinct and are possibly different species. Furthermore, production of and response to the isomers of brevicomin by flying Dendroctonus frontalis Zimmermann in the Arizona site were similar to those of sympatric D. brevicomis. This interspecific signal overlap is likely sustainable since joint species mass-attacks may assist both species in overcoming host defenses, thereby increasing host availability.

KW - Character displacement

KW - Geographic variation

KW - Interspecific attraction

KW - Pheromone

KW - Scolytinae

KW - Southern pine beetle

KW - Western pine beetle

UR - http://www.scopus.com/inward/record.url?scp=84964466705&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84964466705&partnerID=8YFLogxK

U2 - 10.1007/s10886-016-0696-9

DO - 10.1007/s10886-016-0696-9

M3 - Article

SP - 1

EP - 10

JO - Journal of Chemical Ecology

JF - Journal of Chemical Ecology

SN - 0098-0331

ER -