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J Chem Ecol

Title:		Evidence for Semiochemical Divergence Between Sibling Bark Beetle Species: Dendroctonus brevicomis and Dendroctonus barberi
Author(s):		Sullivan BT; Grady AM; Hofstetter RW; Pureswaran DS; Brownie C; Cluck D; Coleman TW; Graves A; Willhite E; Spiegel L; Scarbrough D; Orlemann A; Zuniga G;
Address:		"USDA Forest Service (USFS), Southern Research Station, Pineville, LA, 71360, USA. brian.sullivan2@USDA.gov. USDA Forest Service, Forest Health Protection (USFS-FHP), Flagstaff, AZ, 86001, USA. School of Forestry, Northern Arizona University, Flagstaff, AZ, 86001, USA. Canadian Forest Service, Laurentian Forestry Center, Quebec City, QC, G1V 4C7, Canada. Department of Statistics, North Carolina State University, Raleigh, NC, 27695, USA. USFS-FHP, Susanville, CA, 96130, USA. USFS-FHP, Asheville, NC, 28804, USA. USFS-FHP, Albuquerque, NM, 87102, USA. USFS-FHP, Sandy, OR, 97055, USA. USFS Wallowa-Whitman National Forest (NF), LaGrande, OR, 96130, USA. USFS-FHP, Boise, ID, 83709, USA. USFS, Lassen National Forest, Susanville, CA, 96130, USA. Department of Zoology, Instituto Politecnico Nacional, Mexico City, CP. 1340, Mexico"
Journal Title:		J Chem Ecol
Year:		2021
Volume:		20210106
Issue:		1
Page Number:		10 - 27
DOI:		10.1007/s10886-020-01233-y
ISSN/ISBN:		1573-1561 (Electronic) 0098-0331 (Linking)
Abstract:		"We investigated geographic variation in the semiochemistry of major disturbance agents of western North American pine forests, Dendroctonus brevicomis Le Conte and Dendroctonus barberi Hopkins (Coleoptera: Curculionidae: Scolytinae), species separated by the Great Basin in the USA that until recently were synonymous. At 15 sites in the western USA and northern Mexico, beetle populations were examined to determine (1) pheromone production by solitary, mining females, (2) male electroantennogram amplitudes in response to known semiochemicals for the genus, or (3) relative attractiveness of two female-produced pheromone components (endo- and exo-brevicomin) and two host odors (alpha-pinene and myrcene) to beetles in the field. Compared to female beetles collected east of the Great Basin (D. barberi), western females (D. brevicomis) produced a consistently higher proportion of, and male antenna were correspondingly more sensitive to, the exo- than the endo-isomer of brevicomin. With the exception of one sampling location (where no preference was observed), beetles west of the Great Basin were more attracted to exo- than endo- brevicomin trap lures, whereas eastern beetles displayed the reverse preference. In contrast, there was not a consistent difference between these populations regarding relative attraction or olfactory response to myrcene or alpha-pinene, although some geographic variability was evident. These data show that the semiochemical systems of D. brevicomis and D. barberi have diverged and corroborate genetic and morphological evidence that they are distinct, allopatric species"
Keywords:		"Acyclic Monoterpenes/metabolism Alkenes/metabolism Animals Behavior, Animal Bicyclic Monoterpenes/metabolism Bridged Bicyclo Compounds, Heterocyclic/analysis/*metabolism Coleoptera/*chemistry/physiology Female *Genetic Speciation Host-Parasite Interaction;"
Notes:		"MedlineSullivan, Brian T Grady, Amanda M Hofstetter, Richard W Pureswaran, Deepa S Brownie, Cavell Cluck, Daniel Coleman, Tom W Graves, Andrew Willhite, Elizabeth Spiegel, Lia Scarbrough, Dwight Orlemann, Andrew Zuniga, Gerardo eng Comparative Study 2021/01/07 J Chem Ecol. 2021 Jan; 47(1):10-27. doi: 10.1007/s10886-020-01233-y. Epub 2021 Jan 6"