Extending a Phylogeny-based Method for Detecting Signatures of Multi-level Selection for Applications in Artificial Life

TL;DR

This paper evaluates and improves a phylogeny-based method for detecting multilevel selection in artificial life, demonstrating its effectiveness in complex epidemiological models with trade-offs and environmental variability.

Contribution

It introduces an alternative normalization procedure and validates the method's robustness in challenging, dynamic simulation environments.

Findings

Detects multilevel selection with 30% effect sizes

Sensitive to mutation effects of 10% or more

Method remains robust under environmental changes

Abstract

Multilevel selection occurs when short-term individual-level reproductive interests conflict with longer-term group-level fitness effects. Detecting and quantifying this phenomenon is key to understanding evolution of traits ranging from multicellularity to pathogen virulence. Multilevel selection is particularly important in artificial life research due to its connection to major evolutionary transitions, a hallmark of open-ended evolution. Bonetti Franceschi & Volz (2024) proposed to detect multilevel selection dynamics by screening for mutations that appear more often in a population than expected by chance (due to individual-level fitness benefits) but are ultimately associated with negative longer-term fitness outcomes (i.e., smaller, shorter-lived descendant clades). Here, we use agent-based modeling with known ground truth to assess the efficacy of this approach. To test these methods under challenging conditions broadly comparable to the original dataset explored by Bonetti Franceschi & Volz (2024), we use an epidemiological framework to model multilevel selection in trade-offs between within-host growth rate and between-host transmissibility. To achieve success on our in silico data, we develop an alternate normalization procedure for identifying clade-level fitness effects. We find the method to be sensitive in detecting genome sites under multilevel selection with 30% effect sizes on fitness, but do not see sensitivity to smaller 10% mutation effect sizes. To test the robustness of this methodology, we conduct additional experiments incorporating extrinsic, time-varying environmental changes and adaptive turnover in population compositions, and find that screen performance remains generally consistent with baseline conditions. This work represents a promising step towards rigorous generalizable quantification of multilevel selection effects.