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- W3184052421 endingPage "4206.e3" @default.
- W3184052421 startingPage "4195" @default.
- W3184052421 abstract "Reconstructing the tempo at which biodiversity arose is a fundamental goal of evolutionary biologists, yet the relative merits of evolutionary-rate estimates are debated based on whether they are derived from the fossil record or time-calibrated phylogenies (timetrees) of living species. Extinct lineages unsampled in timetrees are known to “pull” speciation rates downward, but the temporal scale at which this bias matters is unclear. To investigate this problem, we compare mammalian diversification-rate signatures in a credible set of molecular timetrees (n = 5,911 species, ∼70% from DNA) to those in fossil genus durations (n = 5,320). We use fossil extinction rates to correct or “push” the timetree-based (pulled) speciation-rate estimates, finding a surge of speciation during the Paleocene (∼66–56 million years ago, Ma) between the Cretaceous-Paleogene (K-Pg) boundary and the Paleocene-Eocene Thermal Maximum (PETM). However, about two-thirds of the K-Pg-to-PETM originating taxa did not leave modern descendants, indicating that this rate signature is likely undetectable from extant lineages alone. For groups without substantial fossil records, thankfully all is not lost. Pushed and pulled speciation rates converge starting ∼10 Ma and are equal at the present day when recent evolutionary processes can be estimated without bias using species-specific “tip” rates of speciation. Clade-wide moments of tip rates also enable enriched inference, as the skewness of tip rates is shown to approximate a clade’s extent of past diversification-rate shifts. Molecular timetrees need fossil-correction to address deep-time questions, but they are sufficient for shallower time questions where extinctions are fewer." @default.
- W3184052421 created "2021-08-02" @default.
- W3184052421 creator A5002518323 @default.
- W3184052421 creator A5005036733 @default.
- W3184052421 creator A5019493623 @default.
- W3184052421 date "2021-10-01" @default.
- W3184052421 modified "2023-10-16" @default.
- W3184052421 title "Molecules and fossils tell distinct yet complementary stories of mammal diversification" @default.
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