马达加斯加肉食动物的单一起源来自一个非洲祖先
Anne D Yoder1, Melissa M Burns, Sarah Zehr
1Department of Ecology and Evolutionary Biology, Yale University, 165 Prospect Street, New Haven, Connecticut 06551, USA. yoder@yale.edu
Nature
|March 1, 2003
概括
马达加斯加的食肉动物起源于一个非洲祖先,这挑战了以前关于多次入侵的理论. 它们在马达加斯加的到来与类动物相隔数百万年,这表明它们是独立的殖民事件.
科学领域:
- 进化生物学 进化生物学
- 岛屿生物地理 岛屿生物地理
- 哺乳动物遗传学 哺乳动物遗传学
背景情况:
- 马达加斯加拥有四种胎盘哺乳动物,尽管它的海洋隔离.
- 马达加斯加哺乳动物的起源由于化石记录有限,人们对其了解甚微.
- 之前的假设表明马拉加斯肉食动物的多次殖民.
研究的目的:
- 为了确定马拉加斯肉食动物的遗传起源.
- 为了估计马达加斯加的哺乳动物群体殖民的时间.
- 测试马达加斯加动物群的单个与多个殖民假设.
主要方法:
- 马达加斯加食肉动物的多基因遗传学分析.
- 对食肉动物和类动物的分歧约会的贝叶斯分析.
主要成果:
- 马达加斯加的食肉动物形成了一个单体群,表明一个单一的祖先殖民事件.
- 马达加斯加的食肉动物和类动物殖民是几千万年分开的.
- 遗传学数据驳斥了对这两种哺乳动物群体存在的单一事件解释.
结论:
- 马拉加斯肉食动物的存在归因于来自非洲祖先的单一殖民.
- 肉食动物和类动物的独特殖民时间排除了两者单一的代理或分散事件.
- 了解马达加斯加的哺乳动物生物地理需要考虑多个,暂时分离的殖民事件.
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