Swenson Nathan G, Howard Daniel J
Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721, USA.
Am Nat. 2005 Nov;166(5):581-91. doi: 10.1086/491688. Epub 2005 Aug 30.
A recent test for the existence of suture zones in North America, based on hybrid zones studied since 1970, found support for only two of the 13 suture zones identified by Remington in 1968 (Swenson and Howard 2004). One limitation of that recent study was the relatively small number of hybrid zones available for mapping. In this study, we search for evidence of clustering of contact zones between closely related taxa using data not only from hybrid zones but from species range maps of trees, birds, and mammals and from the position of phylogeographic breaks within species. Digital geographic range maps and a geographic information system approach allowed for accurate and rapid mapping of distributional data. Areas of contact between closely related species and phylogeographic breaks within species clustered into areas characterized by common physiographic features or predicted by previously hypothesized glacial refugia. The results underscore the general importance of geographic barriers to dispersal (mountain chains) and climate change (periods of cooling alternating with periods of warming, which lead to the contraction and expansion of species ranges) in species evolution.
最近一项基于自1970年以来研究的杂交带对北美缝合带存在情况的测试发现，雷明顿在1968年确定的13个缝合带中只有两个得到了支持（斯文森和霍华德，2004年）。该近期研究的一个局限性是可用于绘图的杂交带数量相对较少。在本研究中，我们不仅使用来自杂交带的数据，还使用树木、鸟类和哺乳动物的物种分布图以及物种内系统发育间断的位置数据，来寻找密切相关分类群之间接触带聚集的证据。数字地理分布图和地理信息系统方法使得能够准确且快速地绘制分布数据。密切相关物种之间的接触区域以及物种内的系统发育间断聚集在以共同地貌特征为特征或由先前假设的冰川避难所预测的区域。结果强调了地理扩散障碍（山脉）和气候变化（冷却期与暖期交替，导致物种范围收缩和扩张）在物种进化中的普遍重要性。
