Department of Entomological Sciences, University of California, 94720, Berkeley, California.
J Chem Ecol. 1984 Jun;10(6):861-77. doi: 10.1007/BF00987969.
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.
在油松被星天牛（Dendroctonus brevicomis）定殖的过程中，监测了雌雄个体中具有吸引力（外-短叶烯和法尼醇）和抑制性（反-马鞭烯醇、马鞭烯酮和异丁香烯醇）的信息素的数量。在登陆时，雄虫体内的马鞭烯酮含量最高，而且其衰减速度比其他性别的信息素都要快。雌雄个体中的法尼醇和外-短叶烯的含量在最初钻入寄主后增加，但交配后开始下降。两性个体中的反-马鞭烯醇的含量（雌虫含量显著更高）比外-短叶烯、法尼醇和马鞭烯酮的衰减速度更缓慢。异丁香烯醇仅在雄虫遇到树脂时的攻击初始阶段被发现。研究表明，随着所有信息素成分的普遍下降，吸引力信息素与抑制性信息素反-马鞭烯醇的比例发生足够变化，可能在聚集终止中发挥作用。反-马鞭烯醇可能与马鞭烯酮和异丁香烯醇一起，限制攻击密度，从而限制种内竞争。这些抑制性信息素似乎还导致几种竞争的树皮甲虫避免在被星天牛定殖的区域降落，即使它们自己的信息素存在也是如此。
