Filippova N A
Parazitologiia. 2002 Nov-Dec;36(6):457-68.
A morphometric analysis of different male and female organs used in the process of copulation, including an attachment of the spermatophore to the genital opening of female and placing the spermatophore into the vestibular part of vagina, was carried out for the pairs of ixodid tick species Ixodes persulcatus--I. pavlovskyi and I. persulcatus--I. ricinus in areas of their sympatry. In two disjunctive areas of sympatry of I. persulcatus--I. pavlovskyi (South-East Altai and Southern Primorye), the morphological barrier is displayed in the precopulation mechanism of reproductive isolation and does act only in the pair I. pavlovskyi female--I. persulcatus male. It is proved by the reliable prevalence of the hypostome diameter (in widest part) of I. persulcatus male over the genital opening length of I. pavlovkyi female. Because of this reason, the copulation between these partners cannot take place. On the other hand, there are no any morphological obstacles for a copulation within each species examined and in the combination I. persulcatus female--I. pavlovskyi male, and in any combination of the partners I. persulcatus--I. ricinus in sympatry areas (samples from two locations in the north-west of the Eastern-European Plane have been examined). Morphological peculiarities causing differences in host preference of tick species, that in turn realizes the isolation mechanisms between species, are discussed. Postcopulation non-genetic components of the reproductive isolation mechanism have been found in examined species.
对在交配过程中使用的不同雄性和雌性器官进行了形态计量分析，包括精包与雌性交配孔的附着以及将精包放置到阴道前庭部分，研究对象为硬蜱属蜱种全沟硬蜱——巴甫洛夫硬蜱以及全沟硬蜱——蓖麻硬蜱在其同域分布区域的配对情况。在全沟硬蜱——巴甫洛夫硬蜱同域分布的两个不连续区域（东南阿尔泰和南滨海边疆区），形态学屏障体现在生殖隔离的交配前机制中，且仅在巴甫洛夫硬蜱雌蜱——全沟硬蜱雄蜱的配对中起作用。全沟硬蜱雄蜱口下板直径（最宽处）明显大于巴甫洛夫硬蜱雌蜱交配孔长度，证明了这一点。因此，这些配对个体之间无法进行交配。另一方面，在所研究的每个物种内部以及全沟硬蜱雌蜱——巴甫洛夫硬蜱雄蜱的组合中，以及在同域分布区域全沟硬蜱——蓖麻硬蜱的任何配对组合中（已检查了来自东欧平原西北部两个地点的样本），交配均不存在任何形态学障碍。文中讨论了导致蜱种宿主偏好差异进而实现物种间隔离机制的形态学特征。在所研究的物种中发现了生殖隔离机制的交配后非遗传成分。
