Evidence for Semiochemical Divergence Between Sibling Bark Beetle Species: Dendroctonus brevicomis and Dendroctonus barberi
| Autor: | Amanda M. Grady, Cavell Brownie, Dwight Scarbrough, Andrew Orlemann, Lia Spiegel, Andrew D. Graves, Gerardo Zúñiga, Deepa S. Pureswaran, Richard W. Hofstetter, Tom W. Coleman, Elizabeth A. Willhite, Daniel R. Cluck, Brian T. Sullivan |
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| Rok vydání: | 2020 |
| Předmět: |
Male
Bark beetle Genetic Speciation Acyclic Monoterpenes Allopatric speciation Zoology Alkenes Biochemistry Pheromones Dendroctonus Host-Parasite Interactions Species Specificity Animals Semiochemical Ecology Evolution Behavior and Systematics Antenna (biology) Bicyclic Monoterpenes biology Behavior Animal fungi General Medicine biology.organism_classification Bridged Bicyclo Compounds Heterocyclic Attraction Pinus ponderosa Coleoptera Phylogeography Curculionidae Pheromone Female |
| Zdroj: | Journal of chemical ecology. 47(1) |
| ISSN: | 1573-1561 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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