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• W2138843132 abstract "Abstract Investigations of chemical communication systems in secondary bark beetles (Col., Scolytidae) The chemical communication system of several secondary European bark beetles was investigated. The ash bark beetle, Leperisinus varius , responded in the field to ethanol‐baited traps in significant numbers. Male‐released exo ‐brevicomin increased trap catches of L. varius while another male specific compound, 7‐methyl‐1,6‐dioxaspiro [4.5] decane, proved inhibitory. Hylurgops palliatus , a species colonizing Norway spruce was attracted to traps containing ethanol as a bait; spruce resin acted synergistically. For Dryocoetes autographus , another spruce bark beetle, females were shown to be the host selecting sex, suggesting this species to be monogynous. However, the males release endo ‐ and exo ‐brevicomin which attracted predominantely female D. autographus in the field. With endo ‐brevicomin, only the (+)‐enantiomer elicited response of D. autographus while the antipode did not affect beetle response. In polygynous bark beetle species males are the host selecting sex and as a rule release the aggregating pheromone(s) which attract both males and females. Dispersal losses of hostsearching males are compensated through male polygyny. In contrast, some monogynous bark beetles such as D. autographus seem to balance the sex ratio during host colonization through sexual crossattractiveness of sex‐specific pheromones: Male and female beetles release different pheromone components attracting predominantely beetles of the opposite sex; a phenomenom characteristic for sex pheromones of Lepidoptera. Within associations of bark beetles colonizing Norway spruce investigated in this study, kairomonal effects of pheromones were common. E.g., the aggressive species Ips typographus and Pityogenes chalcographus were attracted to some extent to endo ‐ or exo ‐brevicomin, pheromone components of secondary D. autographus. In contrast, response of D. autographus to baited traps was inhibited when pheromone components of the aggressive species were added. Zusammenfassung Das Aggregationsverhalten verschiedener sekundärer Borkenkäfer wurde untersucht. Hylurgops palliatus: Duftstoffe des Wirts und Ethanol locken synergistisch. Leperisinus varius: Im Freiland locken Ethanol und das ♂‐spezifische exo ‐Brevicomin; ein weiterer Duftstoff der ♂♂, 7‐Methyl‐1,6‐dioxaspiro [4.5] decan, ist ein Ablenkstoff. Dryocoetes autographus: Das (+)‐Isomer des ♂‐spezifischen endo ‐Brevicomin lockt im Freiland zahlreiche Käfer, während der Antipode biologisch inaktiv ist. Die ♂♂ locken mit endo ‐bzw. exo ‐Brevicomin vorwiegend die ♀♀ an; die Lockwirksamkeit dieser Pheromone wird durch Ethanol und Terpene verstärkt. Die Anlockung der D. autographus ‐♀♀ durch ♂‐spezifische Pheromone weist auf ein Aggregationsprinzip hin, das in dieser Arbeit diskutiert wird: das Prinzip der geschlechtsorientierten Anlockung; ♀♀ und/oder ♂♂ locken sich gegenseitig mit Pheromonen, die in Abgabe und Wirkung geschlechtsspezifisch sein können. Hierdurch gelingt es monogynen Arten, den Wirt in einem ausgewogenen Geschlechterverhältnis zu besiedeln, während andere Arten das Geschlechterverhältnis der angelockten Käfer durch die Polygynie der ♂ ausgleichen. Zwischen assoziierten Fichtenborkenkäfern treten zahlreiche kairomonale Effekte von Pheromonkomponenten auf. So werden beispielsweise die aggressiven Rindenbrüter Ips typographus bzw. Pityogenes chalcographus von endo ‐ bzw. exo ‐Brevicomin des sekundären D. autographus angelockt, während umgekehrt Pheromonkomponenten der beiden aggressiven Arten auf D. autographus ablenkend wirken." @default.
• W2138843132 created "2016-06-24" @default.
• W2138843132 creator A5035691592 @default.
• W2138843132 date "1985-01-12" @default.
• W2138843132 modified "2023-10-10" @default.
• W2138843132 title "Untersuchungen über die Pheromonsysteme sekundärer Borkenkäfer (Col., Scolytidae)¹" @default.
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• W2138843132 doi "https://doi.org/10.1111/j.1439-0418.1985.tb02772.x" @default.
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