Montiel-Canales Gustavo, Mayer-Goyenechea Irene Goyenechea, Fernández Badillo Leonardo, Castillo Cerón Jesús M
Rev Biol Trop. 2016 Dec;64(4):1611-24.
One of the most important concepts in Panbiogeography is the generalized track, which represents an ancestral biota fragmented by geological events that can be recovered through several methods, including Parsimony analysis of endemicity (PAE) and endemicity analysis (EA). PAE has been frequently used to identify generalized tracks, while EA is primarily designed to find areas of endemicity, but has been recently proposed for identifying generalized tracks as well. In this study we evaluated these methods to find generalized tracks using the distribution of the 84 snake species of Hidalgo. PAE found one generalized track from three individual tracks (Agkistrodon taylori, Crotalus totonacus and Pliocercus elapoides), supported by 89 % of Bootstrap, and EA identified two generalized tracks, with endemicity index values of 2.71-2.96 and 2.84-3.09, respectively. Those areas were transformed to generalized tracks. The first generalized track was retrieved from three individual tracks (Micrurus bernadi, Rhadinaea marcellae and R. quinquelineata), and the second was recovered from two individual tracks (Geophis mutitorques and Thamnophis sumichrasti). These generalized tracks can be considered a unique distribution pattern, because they resembled each other and agreed in shape. When comparing both methods, we noted that both are useful for identifying generalized tracks, and although they can be used independently, we suggest their complementary use. Nevertheless, to obtain accurate results, it is useful to consider theoretical bases of both methods, along with an appropriate choice of the size of the area. Results using small-grid size in EA are ideal for searching biogeographical patterns within geopolitical limits. Furthermore, they can be used for conservation proposals at state level where endemic species become irreplaceable, and where losing them would imply the extinction of unique lineages.
泛生物地理学中最重要的概念之一是广义轨迹，它代表了因地质事件而破碎的祖先生物区系，可通过多种方法恢复，包括特有性简约分析（PAE）和特有性分析（EA）。PAE经常用于识别广义轨迹，而EA主要用于寻找特有性区域，但最近也被用于识别广义轨迹。在本研究中，我们利用伊达尔戈州84种蛇类的分布评估了这些识别广义轨迹的方法。PAE从三条单独的轨迹（泰勒氏蝮蛇、托托纳克响尾蛇和细颈蛇）中发现了一条广义轨迹，自展支持率为89%，而EA识别出两条广义轨迹，特有性指数值分别为2.71 - 2.96和2.84 - 3.09。这些区域被转化为广义轨迹。第一条广义轨迹是从三条单独的轨迹（贝氏珊瑚蛇、马氏游蛇和五线游蛇）中获取的，第二条是从两条单独的轨迹（多斑地鼠蛇和苏米氏束带蛇）中得到的。这些广义轨迹可被视为一种独特的分布模式，因为它们彼此相似且形状一致。在比较这两种方法时，我们注意到它们都有助于识别广义轨迹，虽然它们可以独立使用，但我们建议将它们结合使用。然而，为了获得准确的结果，考虑两种方法的理论基础以及适当选择区域大小是很有用的。在EA中使用小网格大小的结果对于在地缘政治范围内寻找生物地理模式是理想的。此外，它们可用于州级的保护建议，在这些地方特有物种变得不可替代，失去它们将意味着独特谱系的灭绝。
