Live birth among Iguanian lizards predates Pliocene–Pleistocene glaciations
Live birth among Iguanian lizards predates Pliocene–Pleistocene glaciations
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DOI：
10.1098/rsbl.2009.0707
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发表时间：
2010-04
期刊：
影响因子：
3.3
通讯作者：
J. Schulte;Franck Moreno-Roark
中科院分区：
文献类型：
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作者：
J. Schulte;Franck Moreno-Roark
在四足动物中，有鳞目（蜥蜴和蛇）的胎生估计已独立进化了 100 多次，最常见于生活在寒冷气候环境中的物种。由于这种与寒冷气候的关系，有时假设许多有鳞动物胎生起源发生在过去 2.5-4 迈尔的上新世-更新世冰川期；然而，这一假设未经检验。对 733 种鬣蜥蜥蜴树的分歧年代测定分析恢复了 20 个已经进化出胎生的独立谱系，其中 13 个多物种群体在冰川前进之前（8-66 迈尔前）就获得了活产。这些结果将有鳞动物从产卵到活产的转变置于有充分支持的历史背景中，以便于检查与这种复杂的繁殖转变相关的潜在表型和遗传变化。
Among tetrapods, viviparity is estimated to have evolved independently within Squamata (lizards and snakes) more than 100 times, most frequently in species occupying cold climate environments. Because of this relationship with cold climates, it is sometimes assumed that many origins of squamate viviparity occurred over the past 2.5–4 Myr during the Pliocene–Pleistocene glaciations; however, this hypothesis is untested. Divergence-dating analysis on a 733-species tree of Iguanian lizards recovers 20 independent lineages that have evolved viviparity, of which 13 multispecies groups derived live birth prior to glacial advances (8–66 Myr ago). These results place the transitions from egg-laying to live birth among squamates in a well-supported historical context to facilitate examination of the underlying phenotypic and genetic changes associated with this complex shift in reproduction.