Langor David W, Spence John R, Pohl Greg R
Department of Entomology, University of Alberta, Edmonton, Alberta, T6G 2E3, CANADA.
Evolution. 1990 May;44(3):609-618. doi: 10.1111/j.1558-5646.1990.tb05941.x.
Mountain pine beetles from lodgepole and limber pine in western Canada were crossbred. We compared data about reproductive success and fecundity of parents as well as development, mortality, and fertility of their progeny to determine whether there was reproductive isolation among beetle populations in these hosts. Three factors, directly or indirectly related to the host, influenced reproductive performance of parents (reproductive success, egg gallery length, fecundity, and number of eggs laid per centimeter of gallery) as well as the mortality, dry weight, and fat content of the progeny: (1) the host species in which progeny were reared, (2) the host species in which the female parent was reared, and (3) whether both parents originated from the same or different host species. Limber pine appears to be a better host for Dendroctonus ponderosae reproduction and survival than lodgepole pine. Nonetheless, beetles reared from lodgepole and limber pine can reproduce in either host and will mate with each other. Progeny of all crosses were fertile. Thus, there is no apparent barrier to prevent beetles from the two host species from interbreeding in the field.
对来自加拿大西部黑松和柔枝松的山松甲虫进行了杂交。我们比较了有关亲本繁殖成功率和繁殖力以及子代发育、死亡率和繁殖力的数据，以确定这些寄主中的甲虫种群之间是否存在生殖隔离。三个与寄主直接或间接相关的因素影响了亲本的繁殖性能（繁殖成功率、蛀道长度、繁殖力和每厘米蛀道产卵数）以及子代的死亡率、干重和脂肪含量：（1）子代所饲养的寄主物种，（2）母本所饲养的寄主物种，以及（3）双亲是否来自同一或不同的寄主物种。柔枝松似乎比黑松更适合西松大小蠹的繁殖和生存。尽管如此，由黑松和柔枝松饲养的甲虫可以在任一寄主中繁殖并相互交配。所有杂交组合的子代都具有繁殖能力。因此，没有明显的障碍阻止这两种寄主物种的甲虫在野外杂交。
