Howard Daniel J, Preszler Ralph W, Williams Joseph, Fenchel Sandra, Boecklen William J
Department of Biology, New Mexico State University, Las Cruces, New Mexico, 88003.
Department of Genetics, University of Georgia, Athens, Georgia, 30602.
Evolution. 1997 Jun;51(3):747-755. doi: 10.1111/j.1558-5646.1997.tb03658.x.
The white oaks Quercus gambelii and Q. grisea overlap in distribution in New Mexico and Arizona. Within the region of overlap, there are numerous instances of contact between the two taxa. In some areas of contact morphologically, intermediate trees are common, whereas in others, morphologically intermediate trees are rare or absent. We describe a set of RAPD markers that distinguish between the two species and use these markers to examine patterns of gene exchange in an area of contact in the San Mateo Mountains of New Mexico. The markers are highly coincident with morphology and confirm that hybridization between the two species takes place. Despite the occurrence of hybrids, both species remain distinct, even in areas of sympatry, and marker exchange appears to be limited.
白橡树甘贝尔栎（Quercus gambelii）和灰栎（Q. grisea）在新墨西哥州和亚利桑那州的分布范围有重叠。在重叠区域内，这两个分类群之间有许多接触的实例。在一些形态上的接触区域，中间形态的树木很常见，而在其他区域，形态上的中间树木很少见或不存在。我们描述了一组能区分这两个物种的随机扩增多态性DNA（RAPD）标记，并使用这些标记来研究新墨西哥州圣马特奥山脉一个接触区域的基因交换模式。这些标记与形态高度一致，并证实了这两个物种之间发生了杂交。尽管出现了杂种，但两个物种仍然保持 distinct，即使在同域分布的区域也是如此，而且标记交换似乎是有限的。
这里“distinct”可根据语境灵活翻译为“有差异的”“不同的”等，具体需结合上下文确定最准确的表述。
