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Cytoplasmic incompatibility in populations with overlapping generations.

Michael Turelli¹

¹Department of Evolution and Ecology, University of California, Davis, California 95616, USA. mturelli@ucdavis.edu

Evolution; International Journal of Organic Evolution

|August 19, 2009

Summary

Cytoplasmic incompatibility (CI) bacteria in arthropods can destabilize populations. Understanding these infections, which reduce egg hatch rates, is key to predicting their spread and potential manipulation.

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Area of Science:

Evolutionary biology
Population genetics
Microbial ecology

Background:

Maternally inherited bacteria induce cytoplasmic incompatibility (CI) in insects and arthropods.
CI reduces egg hatch when infected males mate with uninfected females, conferring a reproductive advantage to infected females.

Purpose of the Study:

To analyze the unstable equilibria of CI-causing infections using overlapping-generation models.
To understand how fitness costs associated with CI impact infection dynamics and population stability.

Main Methods:

Developed an idealized overlapping-generation model with age-independent parameters.
Derived an expression for the unstable equilibrium point based on CI intensity and infection effects on life-table parameters.

Main Results:

The unstable equilibrium frequency depends on population growth rate, CI intensity, and effects on development time, longevity, and fecundity.
Age structure complicates the interpretation of equilibrium dynamics.

Conclusions:

The model provides insights into naturally occurring CI infections and their population-level effects.
Understanding CI dynamics can guide strategies for manipulating natural populations, including disease vectors, by introducing specific bacterial infections.