A total-evidence approach to dating with fossils, applied to the early radiation of the hymenoptera.
A total-evidence approach to dating with fossils, applied to the early radiation of the hymenoptera.
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DOI：
10.1093/sysbio/sys058
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发表时间：
2012-12-01
影响因子：
6.5
通讯作者：
Rasnitsyn AP
中科院分区：
文献类型：
--
作者：
Ronquist F;Klopfstein S;Vilhelmsen L;Schulmeister S;Murray DL;Rasnitsyn AP
系统发育的年代通常是通过校准内部节点与化石记录。这依赖于间接的方法，在最坏的情况下，歪曲化石信息。在这里，我们对比这种节点测年的方法，包括化石沿着与现存的分类群在贝叶斯全证据分析。作为一个测试案例，我们专注于Hyattera的早期辐射，主要是由保存不好的印象化石，很难定位的地方。具体来说，我们比较节点测年使用9个校准点来自化石记录与全证据测年的基础上得分为45个化石（4- 20完整）和68个现存类群的343个形态特征。在这两种情况下，我们使用的分子数据从7个标记（105 kb）的现存类群。因为它是很难建模的物种形成，灭绝，采样和化石保存现实，我们开发了一个简单的统一的时钟树与化石之前，我们使用宽松的时钟模型，以适应整个树的速率变化。尽管相当大的不确定性，在大多数化石的位置，我们发现，它们有助于显着的分歧时间的估计，在总证据分析。特别是，发散时间的后验分布对先验假设不太敏感，并且往往比节点日期更精确。全证据分析还表明，在节点测年中使用的七个Hypltera校准点中，有四个可能是基于对化石位置的错误或可疑假设。关于Hyattera的早期辐射，我们的研究结果表明，冠群可以追溯到石炭纪，距今约309 Ma（95%的时间间隔：291- 347 Ma），并且在三叠纪之前，比以前认为的要早得多地分化成主要的现存谱系。[贝叶斯推理;化石年代测定;形态进化;放松时钟;统计遗传学。]
Phylogenies are usually dated by calibrating interior nodes against the fossil record. This relies on indirect methods that, in the worst case, misrepresent the fossil information. Here, we contrast such node dating with an approach that includes fossils along with the extant taxa in a Bayesian total-evidence analysis. As a test case, we focus on the early radiation of the Hymenoptera, mostly documented by poorly preserved impression fossils that are difficult to place phylogenetically. Specifically, we compare node dating using nine calibration points derived from the fossil record with total-evidence dating based on 343 morphological characters scored for 45 fossil (4--20 complete) and 68 extant taxa. In both cases we use molecular data from seven markers (∼5 kb) for the extant taxa. Because it is difficult to model speciation, extinction, sampling, and fossil preservation realistically, we develop a simple uniform prior for clock trees with fossils, and we use relaxed clock models to accommodate rate variation across the tree. Despite considerable uncertainty in the placement of most fossils, we find that they contribute significantly to the estimation of divergence times in the total-evidence analysis. In particular, the posterior distributions on divergence times are less sensitive to prior assumptions and tend to be more precise than in node dating. The total-evidence analysis also shows that four of the seven Hymenoptera calibration points used in node dating are likely to be based on erroneous or doubtful assumptions about the fossil placement. With respect to the early radiation of Hymenoptera, our results suggest that the crown group dates back to the Carboniferous, ∼309 Ma (95% interval: 291--347 Ma), and diversified into major extant lineages much earlier than previously thought, well before the Triassic. [Bayesian inference; fossil dating; morphological evolution; relaxed clock; statistical phylogenetics.]
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影响因子：
9.8
作者：
Drummond AJ;Ho SY;Phillips MJ;Rambaut A
通讯作者：
Rambaut A
影响因子：
64.8
作者：
Engel, MS;Grimaldi, DA
通讯作者：
Grimaldi, DA
DOI：
10.1098/rspb.2009.2299
发表时间：
2010-05-22
影响因子：
4.7
作者：
Davis, Robert B.;Baldauf, Sandra L.;Mayhew, Peter J.
通讯作者：
Mayhew, Peter J.
影响因子：
6.5
作者：
Huelsenbeck, JP;Bollback, JP;Levine, AM
通讯作者：
Levine, AM
影响因子：
6.5
作者：
Blum, Michael G. B.;Francois, Olivier
通讯作者：
Francois, Olivier