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Antagonistic co-evolution and the evolution of genotypic randomization.

¹Department of Zoology, Oxford, U.K.

Journal of Theoretical Biology

|October 23, 1989

Summary

Antagonistic co-evolutionary dynamics favor recombination, with its advantage independent of environmental fluctuation period. This finding requires a new framework for understanding recombination in co-evolutionary contexts.

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Area of Science:

Evolutionary biology
Theoretical ecology

Background:

Antagonistic co-evolution, like host-parasite interactions, drives cyclical dynamics.
Environmental fluctuations can favor recombination, but optimal rates typically decrease with longer fluctuation periods.

Purpose of the Study:

To investigate the influence of co-evolutionary cycling on the advantage of recombination.
To determine if the period of environmental fluctuations affects selection for recombination in co-evolutionary models.

Main Methods:

A simple theoretical model simulating host-parasite co-evolutionary dynamics.
Analysis of selection pressures on recombination rates under fluctuating environmental conditions.

Main Results:

Co-evolutionary cycling provides a period-independent advantage for recombination.
Selection for recombination is only sensitive to fluctuation period when driven by non-co-evolving environmental factors.
The phase difference between host and parasite trajectories, not cycle time, is key.

Conclusions:

The advantage of recombination in co-evolutionary systems is independent of fluctuation period.
A new theoretical framework is needed to explain recombination's role in co-evolution.
Phase relationships in co-evolutionary cycles are crucial and independent of frequency.

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