Influence of Tertiary paleoenvironmental changes on the diversification of South American mammals: a relaxed molecular clock study within xenarthrans.
Influence of Tertiary paleoenvironmental changes on the diversification of South American mammals: a relaxed molecular clock study within xenarthrans.
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DOI：
10.1186/1471-2148-4-11
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发表时间：
2004-04-28
影响因子：
3.4
通讯作者：
Douzery EJ
中科院分区：
文献类型：
--
作者：
Delsuc F;Vizcaíno SF;Douzery EJ
生物体之间的比较基因组数据可以重建它们的遗传和进化时间尺度。分子计时最近被用来表明，环境的全球变化已经塑造了不同的陆地生物的进化历史。活的xenarthrans（犰狳、食蚁兽和树懒）是研究过去环境变化对物种多样性影响的理想模型。事实上，现存的xenarthran物种是在第三纪期间在南美洲隔离增强的进化辐射的遗迹，这一时期的主要气候变化和构造事件相对有据可查。我们应用贝叶斯方法，以放松分子钟假设，同时考虑基因之间的进化动力学差异，并结合古生物学的不确定性的三个核基因。我们获得了现存xenarthrans和其他胎盘哺乳动物进化的分子时间尺度。分歧时间估计提供了大量的证据，同期的多样化事件之间的独立xenarthran血统。这种相互关联的多样化模式可能与新生代期间南美洲发生的重大环境变化有关。观察到的行星和生物事件之间的同步性表明，全球变化在塑造现存xenarthrans的进化历史中发挥了至关重要的作用。我们的研究结果开辟了进一步测试这一假设在其他南美哺乳动物特有的像hystricognath啮齿动物，platyrrhine灵长类动物，和didelphid有袋动物。
Comparative genomic data among organisms allow the reconstruction of their phylogenies and evolutionary time scales. Molecular timings have been recently used to suggest that environmental global change have shaped the evolutionary history of diverse terrestrial organisms. Living xenarthrans (armadillos, anteaters and sloths) constitute an ideal model for studying the influence of past environmental changes on species diversification. Indeed, extant xenarthran species are relicts from an evolutionary radiation enhanced by their isolation in South America during the Tertiary era, a period for which major climate variations and tectonic events are relatively well documented. We applied a Bayesian approach to three nuclear genes in order to relax the molecular clock assumption while accounting for differences in evolutionary dynamics among genes and incorporating paleontological uncertainties. We obtained a molecular time scale for the evolution of extant xenarthrans and other placental mammals. Divergence time estimates provide substantial evidence for contemporaneous diversification events among independent xenarthran lineages. This correlated pattern of diversification might possibly relate to major environmental changes that occurred in South America during the Cenozoic. The observed synchronicity between planetary and biological events suggests that global change played a crucial role in shaping the evolutionary history of extant xenarthrans. Our findings open ways to test this hypothesis further in other South American mammalian endemics like hystricognath rodents, platyrrhine primates, and didelphid marsupials.
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影响因子：
3.1
作者：
Eizirik, E;Murphy, WJ;O'Brien, SJ
通讯作者：
O'Brien, SJ
DOI：
10.1098/rspb.2001.1702
发表时间：
2001-08-07
影响因子：
4.7
作者：
Delsuc, F;Catzeflis, FM;Douzery, EJP
通讯作者：
Douzery, EJP
影响因子：
3.5
作者：
Cao, Y;Fujiwara, M;Hasegawa, M
通讯作者：
Hasegawa, M
影响因子：
56.9
作者：
Bossuyt, F;Milinkovitch, MC
通讯作者：
Milinkovitch, MC
影响因子：
3.9
作者：
Douzery, EJP;Delsuc, F;Huchon, D
通讯作者：
Huchon, D