Lavin Matt, Schrire Brian P, Lewis Gwilym, Pennington R Toby, Delgado-Salinas Alfonso, Thulin Mats, Hughes Colin E, Matos Angela Beyra, Wojciechowski Martin F
Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA.
Philos Trans R Soc Lond B Biol Sci. 2004 Oct 29;359(1450):1509-22. doi: 10.1098/rstb.2004.1536.
Penalized likelihood estimated ages of both densely sampled intracontinental and sparsely sampled transcontinental crown clades in the legume family show a mostly Quaternary to Neogene age distribution. The mode ages of the intracontinental crown clades range from 4-6 Myr ago, whereas those of the transcontinental crown clades range from 8-16 Myr ago. Both of these young age estimates are detected despite methodological approaches that bias results toward older ages. Hypotheses that resort to vicariance or continental history to explain continental disjunct distributions are dismissed because they require mostly Palaeogene and older tectonic events. An alternative explanation centring on dispersal that may well explain the geographical as well as the ecological phylogenetic structure of legume phylogenies is Hubbell's unified neutral theory of biodiversity and biogeography. This is the only dispersalist theory that encompasses evolutionary time and makes predictions about phylogenetic structure.
豆科植物中，对大陆内部密集采样和跨大陆稀疏采样的冠层分支进行的惩罚似然估计年龄显示，其年龄分布大多从第四纪到新近纪。大陆内部冠层分支的众数年龄范围为400万至600万年前，而跨大陆冠层分支的众数年龄范围为800万至1600万年前。尽管方法偏向于得出更古老的年龄结果，但仍检测到这两个较年轻的年龄估计。诉诸于隔离分化或大陆历史来解释大陆间断分布的假说被摒弃，因为它们大多需要古近纪及更古老的构造事件。一个以扩散为中心的替代解释是哈贝尔的生物多样性和生物地理学统一中性理论，它很可能解释了豆科系统发育的地理以及生态系统发育结构。这是唯一涵盖进化时间并对系统发育结构做出预测的扩散主义理论。
