a molecular genetic timescale for the diversification of autotrophic stramenopiles (ochrophyta) substantive underestimation of putative fossil ages分子遗传时间表的多元化自养stramenopiles(ochrophyta)实质性假定的化石年龄的低估.pdfVIP
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a molecular genetic timescale for the diversification of autotrophic stramenopiles (ochrophyta) substantive underestimation of putative fossil ages分子遗传时间表的多元化自养stramenopiles(ochrophyta)实质性假定的化石年龄的低估
A Molecular Genetic Timescale for the Diversification of
Autotrophic Stramenopiles (Ochrophyta): Substantive
Underestimation of Putative Fossil Ages
1 2
Joseph W. Brown , Ulf Sorhannus *
1 Museum of Zoology and Department of Ecology Evolutionary Biology, University of Michigan, Ann Arbor, Michigan, United States of America, 2 Department of Biology
Health Services, Edinboro University of Pennsylvania, Edinboro, Pennsylvania, United States of America
Abstract
Background: Stramenopiles constitute a large and diverse eukaryotic clade that is currently poorly characterized from both
phylogenetic and temporal perspectives at deeper taxonomic levels. To better understand this group, and in particular the
photosynthetic stramenopiles (Ochrophyta), we analyzed sequence data from 135 taxa representing most major lineages.
Our analytical approach utilized several recently developed methods that more realistically model the temporal
evolutionary process.
Methodology/Principal Findings: Phylogenetic reconstruction employed a Bayesian joint rate- and pattern-heterogeneity
model to reconstruct the evolutionary history of these taxa. Inferred phylogenetic resolution was generally high at all
taxonomic levels, sister-class relationships in particular receiving good statistical support. A signal for heterotachy was
detected in clustered portions of the tree, although this does not seem to have had a major influence on topological
inference. Divergence time estimates, assuming a lognormally-distributed relaxed molecular clock while accommodating
topological uncertainty, were broadly congruent over alternative temporal prior distributions. These data suggest that
Ochrophyta originated near the Proterozoic-Phanerozoic boundary, d
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