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Related Experiment Video

Updated: May 8, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Evolutionary branching under slow directional evolution.

Hiroshi C Ito¹, Ulf Dieckmann²

¹Evolution and Ecology Program, International Institute for Applied Systems Analysis, Schlossplatz 1, A-2361 Laxenburg, Austria; Department of Evolutionary Studies of Biosystems, The Graduate University for Advanced Studies (Sokendai), Hayama 240-0193, Kanagawa, Japan.

Journal of Theoretical Biology

|September 10, 2013

Summary

This summary is machine-generated.

Evolutionary branching diversifies species through ecological interactions. New conditions reveal how disruptive selection in one trait can drive branching, even with directional selection on another.

Keywords:

Adaptive dynamics Frequency-dependent selection Multi-dimensional traits Speciation Two-dimensional traits

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Area of Science:

Evolutionary biology
Ecological interactions
Speciation

Background:

Evolutionary branching drives diversification via ecological interactions.
Asexual populations with rare mutations branch through trait-substitution sequences.
Univariate traits require disruptive selection at convergence-stable points for branching.

Purpose of the Study:

Extend evolutionary branching conditions to bivariate trait spaces.
Analyze how selection on one trait affects branching influenced by another.
Develop a generalized condition for evolutionary branching in multivariate traits.

Main Methods:

Investigated trait-substitution sequences using maximum-likelihood invasions (MLIPs).
Derived a sufficient condition for bivariate trait branching along MLIPs.
Employed numerical analyses to validate generalized branching conditions.

Main Results:

Identified a threshold ratio for disruptive selection to overcome opposing directional selection in bivariate traits.
Demonstrated that branching can occur along evolutionary-branching lines with weak residual directional selection.
Validated generalized conditions as indicators of branching likelihood beyond MLIPs and rare mutations.

Conclusions:

Established conditions for evolutionary branching in bivariate and multivariate trait spaces.
Showcased the interplay between disruptive and directional selection in evolutionary diversification.
Provided a framework for predicting evolutionary branching in complex trait interactions.