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  • 1
    Electronic Resource
    Electronic Resource
    Interactions between components of the aggregation pheromone during chemotaxis by the bark beetleIps paraconfusus (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 863-879 
    Details
    ISSN: 1573-1561
    Keywords: Olfaction ; ipsenol ; ipsdienol ; cis-verbenol ; chemotaxis ; perception ; discrimination ; neural models ; logit models ; stimulus-response models ; Ips paraconfusus ; Coleoptera ; Scolytidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The male-produced aggregation pheromone inIps paraconfusus is composed of three compounds. Female bark beetles were exposed to combinations of these compounds, presented as point sources in an enclosed, circular arena. By itself,cis-verbenol (cV) had no effect on the number of beetles that reached the source. Either ipsenol (Ip) alone or ipsdienol (Id) alone strongly increased the number that reached the source, with Id producing a dose-response curve with a much steeper slope. cV moved the onset of the response to Id to higher doses of Id, but the response rose more rapidly after onset than when cV was absent. Overall, cV inhibited the effect of Id except at the highest dose. cV affected the onset of the response to Ip little or none, but strongly increased the slope of the response, synergizing the effect of Ip. The responses to combinations of Id and Ip were related to the log of a linear combination of their doses. The results are consistent with a model where Id and Ip act at a single site of action, but with different potencies, while cV appears to modify the effects of Id and Ip, rather than affecting the site of action directly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985016
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  • 2
    Electronic Resource
    Electronic Resource
    Attractive and inhibitory pheromones produced in the bark beetle,Dendroctonus brevicomis, during host colonization: Regulation of inter- and intraspecific competition (1984)
    Springer
    Journal of chemical ecology 10 (1984), S. 861-877 
    Details
    ISSN: 1573-1561
    Keywords: Coleoptera ; Scolytidae ; Cleridae ; Dendroctonus brevicomis ; Enoclerus lecontei ; Pinus ponderosa ; bark beetle ; exo-brevicomin ; frontalin ; verbenone ; trans-verbenol ; ipsdienol ; aggregation ; pheromone ; competition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Quantities of attractive (exo-brevicomin and frontalin) and inhibitory (trans-verbenol, verbenone, and ipsdienol) pheromones were monitored in both sexes ofDendroctonus brevicomis during their colonization of a ponderosa pine. Verbenone was found in males in the greatest amounts at the time of landing, and it declined more rapidly than the other pheromones in either sex. The amounts of frontalin andexo-brevicomin in males and females, respectively, increased after initial boring within the host but began to decline after mating. The quantity oftrans-verbenol in both sexes (females had significantly more) declined more gradually thanexo-brevicomin, frontalin, and verbenone. Ipsdienol was found only in males during the initial stages of attack when encountering the resin. It is suggested that along with a general decline in all pheromonal components, a sufficient change in the ratio of the attractive pheromones to an inhibitory pheromone,trans-verbenol, may play a role in termination of aggregation.trans-Verbenol may also function along with verbenone and ipsdienol in limiting the density of attack and thus intraspecific competition. These inhibitory pheromones also appear to cause several competing species of bark beetle to avoid landing in areas infested withD. brevicomis, even when their own pheromone is present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987969
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  • 3
    Electronic Resource
    Electronic Resource
    The role of lanierone in the chemical ecology ofIps pini (Coleoptera: Scolytidae) in California (1992)
    Springer
    Journal of chemical ecology 18 (1992), S. 2305-2329 
    Details
    ISSN: 1573-1561
    Keywords: Coleoptera ; Scolytidae ; Cleridae ; Trogositidae ; Pteromalidae ; Ips pini ; Dendroctonus brevicomis ; Enoclerus lecontei ; Enoclerus sphegeus ; Temnochila chlorodia ; Tomicobia tibialis ; ipsdienol ; lanierone ; aggregation pheromone ; kairomone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Five doses of lanierone (2-hydroxy-4,4,6-trimethyl-2,5-cyclohexadien-1-one) were tested with one dose of enantiomerically pure [99.4% (4R)-(−)] ipsdienol (2-methyl-6-methylene-2,7-octadien-4-ol) for activity as an aggregation pheromone ofIps pini (Say) in California. The response ofI. pini to 1 mg/day ipsdienol + 20 μg/day lanierone was significantly greater than the response to ipsdienol alone, but the response pattern did not demonstrate a clear dose-response relationship. The response to the highest dose of lanierone (2 mg/day) was significantly lower than the response to ipsdienol alone. Ipsdienol attracted significantly moreI. pini than a male-infested log. Lanierone did not alter the percentage of maleI. pini responding to ipsdienol alone. Neither sex ofI. pini orDendroctonus brevicomis LeConte from California produced detectable amounts of lanierone, but myrcene-aerated maleD. brevicomis produced 97.8%-(4S)-(+)-ipsdienol. The black-bellied clerid,Enoclerus lecontei (Wolcott) (Coleoptera: Cleridae) was attracted to lanierone when released with ipsdienol. Neither compound was attractive when released alone, proving synergism for the kairomone of this predator. Lanierone did not influence the response of the predatorsTemnochila chlorodia (Mannerheim) (Coleoptera: Trogositidae) andEnoclerus sphegeus (F.) (Coleoptera: Cleridae), which were attracted to all treatments containing ipsdienol.Tomicobia tibialis Ashmead (Hymenoptera: Pteromalidae) responded in significantly greater numbers to the male-infested log than it did to ipsdienol or ipsdienol + 20 μg/day lanierone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984952
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  • 4
    Electronic Resource
    Electronic Resource
    Enantiomeric composition of ipsdienol: A chemotaxonomic character for north American populations ofIps spp. in thepini subgeneric group (coleoptera: Scolytidae) (1995)
    Springer
    Journal of chemical ecology 21 (1995), S. 995-1016 
    Details
    ISSN: 1573-1561
    Keywords: Insecta ; Coleoptera ; Scolytidae ; Ips pini ; Ips avulsus ; Ips bonanseai ; ipsdienol ; 2-methyl-6-methylene-2,7-octadien-4-ol ; aggregation pheromone ; enantiomeric composition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Thirty-five populations ofIps pini (Say) and one population each ofIps avulsus (Eichhoff) andIps bonanseai (Hopkins) were analyzed for the enantiomeric composition of ipsdienol (2-methyl-6-methylene-2,7-octadien-4-ol). Populations ofI. pini occur as at least two distinct regional pheromone variants: New York type [32%-(−) to 56%-(−)-ipsdienol] and California type [94%-(−) to 98%-(−)-ipsdienol]. A third phenotype may occur in southeastern British Columbia, Idaho, and Montana [91%-(−) to 95%-(−)], possibly indicating a zone of hybridization. Populations of the New York type occur in southwestern British Columbia, Alberta, Saskatchewan, Minnesota, and Wisconsin suggesting a continuum through the Canadian provinces and Lake States. The presence of the New York type in western Canada is likely linked to the Quaternary history of the transcontinentally distributed host,Pinus banksiana Lamb. MaleI. avulsus [∼25%-(−)] and maleI. bonanseai [−29%-(−)] both produce ipsdienol, but not ipsenol. Production of ipsdienol by maleI. pini was evaluated in six differentPinus spp. hosts. Following transfer of maleI. pini to hosts other than the host of origin, the percentage of the (−)-enantiomer of ipsdienol declined when compared to production in the host of origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02033804
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