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Related Experiment Video

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

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Published on: February 3, 2023

Model for macroevolutionary dynamics.

Yosef E Maruvka1, Nadav M Shnerb, David A Kessler

  • 1Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute, Boston, MA 02115, USA.

Proceedings of the National Academy of Sciences of the United States of America
|June 20, 2013
PubMed
Summary
This summary is machine-generated.

A new speciation-extinction-origination (SEO) model accurately describes species-per-genus distributions and evolutionary dynamics. This macroevolutionary model aligns with fossil and molecular data, supporting consistent genus boundaries.

Keywords:
Linnean taxonomydiversification rategenera originationspecies-within-genus statistics

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Area of Science:

  • Macroevolutionary dynamics
  • Biodiversity and diversification modeling
  • Taxonomic and phylogenetic analysis

Background:

  • Skewed species-genus distributions present challenges for macroevolutionary studies.
  • Previous models of diversification often neglect extinction or use simplified birth-death processes.
  • Understanding species formation, extinction, and morphological evolution is crucial.

Purpose of the Study:

  • To extend and validate a generic, neutral speciation-extinction (of species)-origination (of genera; SEO) model.
  • To analyze macroevolutionary dynamics and taxon diversification using the SEO model.
  • To assess the model's fit with empirical data on species-per-genus distributions and appearance times.

Main Methods:

  • Development and simulation of the generic, neutral speciation-extinction-origination (SEO) model.
  • Analysis of species-per-genus distributions to detect deviations from homogeneity assumptions.
  • Comparison of model predictions for taxonomic group appearance times with molecular and fossil data.

Main Results:

  • The SEO model effectively fits observed species-per-genus distributions for large taxonomic groups.
  • Model predictions for appearance times correlate well with estimates from molecular and fossil records.
  • Fitted extinction rates for large clades approximate speciation rates, indicating high species turnover.

Conclusions:

  • The SEO model provides a robust framework for understanding macroevolutionary diversification dynamics.
  • The model supports the consistency of genus boundaries defined by morphological differences.
  • It offers a valuable comparator for lineage splitting and morphological evolution rates.