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Speciation Rates

Speciation Rates

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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.

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Formation of Species

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Related Experiment Video

Updated: Oct 16, 2025

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Published on: February 3, 2023

Nucleotide Substitutions during Speciation may Explain Substitution Rate Variation.

Thijs Janzen¹, Folmer Bokma², Rampal S Etienne¹

¹Groningen Institute for Evolutionary Life Sciences, University of Groningen, Box 11103, 9700 CC Groningen, The Netherlands.

Systematic Biology

|October 21, 2021

Summary

This summary is machine-generated.

Elevated mutation rates during speciation events may explain variation in substitution rates across the tree of life. This finding impacts phylogenetic reconstruction by shifting mutations from branches to speciation events.

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Area of Science:

Evolutionary biology
Molecular evolution
Phylogenetics

Background:

Mutation rate variation is observed across evolutionary lineages, despite conserved mutation mechanisms.
Relaxed molecular clocks are commonly used in phylogenetic reconstruction to account for rate variation, but lack biological mechanism.
Existing models do not fully explain the observed substitution rate variation.

Purpose of the Study:

To propose and investigate the hypothesis that elevated mutation rates during speciation events contribute to observed substitution rate variation.
To assess the impact of this proposed mechanism on phylogenetic reconstruction and molecular clock models.

Main Methods:

Computer simulations were used to model phylogenetic scenarios.
Simulations incorporated a shift of mutations from evolutionary branches to speciation events.
The impact on phylogenetic branching time inference and the fit to molecular clock models were analyzed.

Main Results:

Shifting mutations to speciation events significantly impacts the inference of branching times in phylogenetic reconstruction.
Nucleotide alignments generated under this model are better described by a relaxed molecular clock than a strict one.
The proposed mechanism offers a potential biological explanation for substitution rate variation.

Conclusions:

Elevated mutation rates during speciation represent a plausible biological factor contributing to substitution rate variation across the tree of life.
This mechanism provides a more biologically grounded explanation for patterns typically modeled by relaxed molecular clocks.
Further research can explore empirical evidence for elevated mutation rates during speciation events.