Parallel adaptive radiations in two major clades of placental mammals
Parallel adaptive radiations in two major clades of placental mammals
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DOI：
10.1038/35054544
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发表时间：
2001-02-01
期刊：
影响因子：
64.8
通讯作者：
Springer, MS
中科院分区：
文献类型：
--
作者：
Madsen, O;Scally, M;Springer, MS
胎盘哺乳动物之间的高级关系以及该群体的历史生物地理学和形态多样化仍不清楚(1-3)。在这里，我们分析了独立的分子数据集，其中所有胎盘哺乳动物的 DNA 长度分别为 5,708 和 2,947 个碱基对。系统发育分析将胎盘目分为四组：Xenarthra、Afrotheria、Laurasiatheria 和 Euarchonta plus Glires。前三组始终是单系的，具有不同的分析方法。 Euarchonta 和 Glires 是单系的还是并系的，具体取决于系统发育方法。 BRCA1 基因外显子 11 中独特的九个碱基对缺失为 Afrotheria 的单系提供了额外的支持，其中包括长鼻目、海牛目、蹄甲目、管齿目、大目目、金绿目和马齿苋目。劳亚兽亚纲包含鲸头类、奇蹄类、食肉动物、穿山甲、蝙蝠和食虫动物。劳拉兽亚目和非洲兽亚目中也发生了平行的适应性辐射。每个类群中都有水生动物、有蹄类动物和食虫类动物。
Higher level relationships among placental mammals, as well as the historical biogeography and morphological diversification of this group, remain unclear(1-3). Here we analyse independent molecular data sets, having aligned lengths of DNA of 5,708 and 2,947 base pairs, respectively, for all orders of placental mammals. Phylogenetic analyses resolve placental orders into four groups: Xenarthra, Afrotheria, Laurasiatheria, and Euarchonta plus Glires. The first three groups are consistently monophyletic with different methods of analysis. Euarchonta plus Glires is monophyletic or paraphyletic depending on the phylogenetic method. A unique nine-base-pair deletion in exon 11 of the BRCA1 gene provides additional support for the monophyly of Afrotheria, which includes proboscideans, sirenians, hyracoids, tubulidentates, macroscelideans, chrysochlorids and tenrecids. Laurasiatheria contains cetartiodactyls, perissodactyls, carnivores, pangolins, bats and eulipotyphlan insectivores. Parallel adaptive radiations have occurred within Laurasiatheria and Afrotheria. In each group, there are aquatic, ungulate and insectivore-like forms.