The Dow Gardens, 1018 W. Main St., 48640, Midland, Michigan.
J Chem Ecol. 1991 Aug;17(8):1705-14. doi: 10.1007/BF00984698.
The bark beetleIps pini (Say) displays variation in its response to and production of enantiomeric blends of its pheromone ipsdienol. One of the principal predators ofIps pini isThanasimus dubius (F.), which uses ipsdienol as a kairomone for prey location. During 1988 and 1989, in Wisconsin and Michigan, the response of both species to a range of enantiomeric blends of ipsdienol was investigated. Blends tested had the following ratios of the (S)-(+) to (R)-(-) enantiomers: 3%∶97%, 25%∶75%, 50%∶50%, 75%∶ 25%, and 97%∶ 3%. Either 75% (+)∶25% (-) or 50% (+)∶50% (-) ipsdienol captured the mostIps pini in both years at both sites. The 25% (+)∶75% (-) blend also caught moreIps pini than the control during both years at both sites. All blends tested were attractive toThanasimus dubius in both years at both locations. Blend preferences of both species were variable and labile at both sites. Response patterns of both species in Wisconsin were different from those in Michigan each year. Furthermore, response patterns of both species to the ipsdienol blends changed from 1988 to 1989 at both locations. A genetic component to this variation would permit predator-prey coevolution, as well as the development of resistance byIps pini to management strategies based on mass-trapping with single blends.
松纵坑切梢小蠹（Ips pini ）对其信息素 ipsdienol 的对映体混合物的反应和产生存在变化。松纵坑切梢小蠹的主要捕食者之一是 Thanasimus dubius （F.），它将 ipsdienol 用作猎物定位的信息素。1988 年和 1989 年，在威斯康星州和密歇根州，研究了这两个物种对一系列 ipsdienol 对映体混合物的反应。测试的混合物具有以下（S）-（+）和（R）-（-）对映体的比例：3％∶97％，25％∶75％，50％∶50％，75％∶25％和 97％∶3％。无论是 75％（+）∶25％（-）还是 50％（+）∶50％（-）ipsdienol，在两年的两个地点都捕获了最多的 Ips pini。在两年的两个地点，25％（+）∶75％（-）的混合物比对照捕获的 Ips pini 也更多。在两年的两个地点，所有测试的混合物对 Thanasimus dubius 都有吸引力。两种物种的混合物偏好都在两个地点具有变异性和不稳定性。这两个物种在威斯康星州的反应模式每年都与密歇根州不同。此外，这两个物种对 ipsdienol 混合物的反应模式在两年的两个地点都发生了变化。这种变化的遗传成分将允许捕食者-猎物的共同进化，以及 Ips pini 对基于单一混合物的大规模诱捕的管理策略产生抗性。
