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  • 1
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Les chercheurs précédents ont émis l'hypothèse, voire conclu, que les femelles deCoeloides brunneri Viereck détectent les Scolytes hôtes en percevant les vibrations ou le bruit émis par des larves foreuses. Pourtant, après qu'on les ait placées sur des troncs contenant desDendroctonus pseudotsugae Hopkins, à des stades différents de développement, engagées dans un forage intensif, les femelles deC. brunneri cherchèrent activement leur hôte uniquement sur des troncs infestés de couvées de larves jeunes ou proches de leur maturité, et pondirent uniquement sur les troncs contenant des couvées proches de leur maturité. De plus, lorsqu'on leur a offert des larves dans des troncs qui avaient été gelés à une température d'environ − 50°C, et dégelés à la température ambiante pendant deux' jours, elles trouvèrent les larves immobiles et mortes et pondirent sur ces larves à travers l'écorce. Par conséquentC. brunneri est capable de trouver son hôte en percevant un autre stimulus (ou d'autres stimuli) que le bruit ou la vibration.
    Notes: Abstract Previous researchers, have speculated or concluded thatCoeloides brunneri Viereck females detect their bark beetle hosts by perception of the vibrations or sound made by boring larvae. However, when placed on logs containing various actively mining stages ofDendroctonus pseudotsugae Hopkins,C. brunneri females actively searched for the host only on logs infested with young or maturing brood larvae, and oviposited only in logs with maturing brood larvae. Moreover, when offered larvae in logs that had been frozen at approximately − 50°C, and then allowed to thaw at room temperature for 2 days, they found the motionless, dead larvae, and oviposited through the bark on to them. Therefore,C. brunneri is able to find ist host by perception of some stimulus (or stimuli) other than sound or vibration.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of chemical ecology 10 (1984), S. 487-492 
    ISSN: 1573-1561
    Keywords: Dendroctonusfrontalis ; Coleoptera ; Scolytidae ; Thanasimus dubius ; Cleridae ; southern pine beetle ; kairomone ; behavior ; olfaction ; coevolution ; predator ; enantiomer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Insect predators can be guided to their prey by a kairomonal response to the prey pheromone. We found this phenomenon to be highly specific in the bark beetle predatorThanasimus dubius. Olfactory responses and behavioral tests revealed that the predator is guided to its major preyDendroctonusfrontalis by the primary enantiomer of the pheromone of the prey, (1S, 5R)-(−)-frontalin. These and other findings suggest the co-evolution of a kairomone system of the predator and the pheromone system of its prey.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-1561
    Keywords: Dendroctonus frontalis ; Coleoptera ; Scolytidae ; seasonal variation ; pheromone content ; environmental parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The response ofDendroctonus frontalis to an attractant mixture (frontalin,trans-verbenol, and loblolly pine turpentine) was measured in the laboratory over a four-year period. Beetle response was highest in late winter and early spring, and lowest in midsummer and early fall. Males consistently responded higher than females. Female beetles displayed significantly higher responses in early morning and late afternoon than in the middle of the day. Analysis of beetle pronotal width and fat content revealed a high degree of correlation between these two parameters in female beetles, but there was no correlation of response with either fat content or pronotal width for either sex. There was no evident relationship between mean monthly beetle response and total amounts of frontalin andtrans-veibenol found in hindgut extracts. Daily temperature in months both during which beetles were bioassayed and immediately prior to bioassay was highly correlated to response to the attractant.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of chemical ecology 3 (1977), S. 291-308 
    ISSN: 1573-1561
    Keywords: Lymantria dispar ; gypsy moth ; sex pheromone ; sexual behavior ; disparlure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The pheromone-mediated behavior of gypsy moth males was studied in both natural and simulated populations in central Pennsylvania. Feral males released into 50-m-diam plots, each with 2 feral females around the perimeter, oriented initially to trees and not to females. Neither exposure to virgin females nor exposure to wicks baited with approx 6 mg disparlure affected the subsequent sexual activity of males released into the 0.2-hectare plots. Males released into untreated plots, following 24 hr exposure in an area treated with approx 37 g/hectare of microencapsulated disparlure, located and mated with feral females within 4 min after release. None of the released males was caught in disparlure-baited Delta traps. In the disparlure-treated plot none of the females was mated. Males within this treated plot continued to search actively but did not settle down on the bark surface and initiate short-range (〈 15 cm) search behavior. In plots testing the effect of various ratios of baited wicks to virgin females on disruption, there was no evidence of mating disruption due to point-source confusion. There were no significant differences in the responses of feral males to either virgin females or the various portions of Hercon wicks placed out in 0.2-hectare plots. In a series of tests using feral virgin females given various treatments to alter their physical and chemical characteristics (i.e., removed wings, denuded abdomen, washed in xylene, etc.), all females elicited the full range of sexual behavior responses of the male moths in natural populations. Apparently, males stimulated by pheromone are capable of using a number of different additional stimuli to initiate and terminate short-range sexual behavior patterns.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-1561
    Keywords: Enantiomers ; bark beetle ; pheromone ; Dendroctonus frontalis ; Coleoptera ; Scolytidae ; southern pine beetle ; electrophysiology ; olfaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In laboratory and field bioassays, the response ofDendroctonus frontalis was significantly greater to the mixture of (1S, 5R)-(−)-frontalin andalpha-pinene than to (1R,5S)-(+)-frontalin andalpfa-pinene. Electro-physiological studies revealed that antennal olfactory receptor cells were significantly more responsive to (1S, 5R)-(−)-frontalin than to (1R, 5S)-(+)-frontalin. Both enantiomers stimulated the same olfactory cells which suggests that each cell possesses at least two types of enantiomer-specific acceptors.
    Type of Medium: Electronic Resource
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