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- W2773833256 abstract "Abstract Hornworts comprise ca. 220 species and are among the oldest landplant lineages, even though their precise phylogenetic position remains unclear. Deep within–hornwort divergences, highly uneven species numbers per genus, and the assumed high stem age together suggest a history of changing diversification (i.e., speciation minus extinction) rates. To study the geographic distribution of modern hornworts and their patterns of species accumulation, we generated a mitochondrial and plastid DNA matrix for 103 species representing all major groups and then applied molecular–clock dating, using a different calibration approach than in earlier work. We used the BAMM software to fit rate–variable and constant–rate birth–death diversification models to the dataset, and we also inferred ancestral areas to a time depth of 55 Ma (Early Eocene). We analyzed diversification rates for all hornworts and separately for species–rich subclades. Under BAMM's variable–rates model (which fits the data better than a constant–rate birth–death model, but still assumes that each species has the same speciation and extinction probability regardless of its age), hornworts have gradually increasing rates of speciation and a constant background extinction rate. No shifts in diversification rate could be detected. The implausible finding of a constant background extinction rate illustrates the limitations of diversification modeling especially as regards extinction rates." @default.
- W2773833256 created "2017-12-22" @default.
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- W2773833256 date "2015-05-01" @default.
- W2773833256 modified "2023-09-25" @default.
- W2773833256 title "Biogeography and diversification rates in hornworts: The limitations of diversification modeling" @default.
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- W2773833256 doi "https://doi.org/10.12705/642.7" @default.
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