Instituto de Ecología, Universidad NacionalAutónoma de México, Apartado Postal 70-275, UNAM,04510 México, D.F.; and.
Am J Bot. 1998 Oct;85(10):1398-408.
A comparative study between an unburned evergreen sclerophyllousvegetation located in south-central Mexico under a wet-summer climate,with mediterranean regions was conducted in order to re-analyzevegetation and plant characters claimed to converge under mediterraneanclimates. The comparison considered floristic composition,plant-community structure, and plant characters as adaptations tomediterranean climates and analyzed them by means of a correspondenceanalysis, considering a tropical spiny shrubland as the external group.We made a species register of the number of species that resproutedafter a fire occurred in 1995 and a distribution map of the evergreensclerophyllous vegetation in Mexico (mexical) under nonmediterraneanclimates.The Tehuacán mexical does not differ from the evergreensclerophyllous areas of Chile, California, Australia, and theMediterranean Basin, according to a correspondence analysis, whichordinated the Tehuacán mexical closer to the mediterranean areasthan to the external group.All the vegetation and floristic characteristics of the mexical, aswell as its distribution along the rain-shadowed mountain parts ofMexico, support its origin in the Madrean-Tethyan hypothesis of Axelrod.Therefore, these results allow to expand the convergence paradigm of thechaparral under an integrative view, in which a general trend to ariditymight explain floristic and adaptive patterns detected in theseenvironments.
为了重新分析被认为在地中海气候下趋同的植被和植物特征，对位于墨西哥中南部夏雨气候下的未燃烧常绿硬叶植被与地中海地区进行了比较研究。该比较考虑了植物区系组成、植物群落结构和植物特征作为对地中海气候的适应，并通过对应分析进行了分析，将热带多刺灌丛作为外部组。我们对 1995 年火灾后重新萌发的物种数量进行了物种登记，并制作了墨西哥非地中海气候下常绿硬叶植被（mexical）的分布图。对应分析表明，特瓦坎 mexical 与智利、加利福尼亚、澳大利亚和地中海盆地的常绿硬叶区没有区别，这表明特瓦坎 mexical 与地中海地区的关系比与外部组更密切。mexical 的所有植被和植物特征及其在墨西哥背风山区的分布都支持其起源于 Axelrod 的 Madrean-Tethyan 假说。因此，这些结果允许在一个综合的视角下扩展灌丛的趋同范式，其中干旱的总体趋势可能解释了在这些环境中检测到的植物区系和适应性模式。
