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Sex ratio under conditional sex expression.

S A Frank¹, I R Swingland

¹Department of Zoology, University of California, Berkeley 94720.

Journal of Theoretical Biology

|December 7, 1988

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Environmental factors, not genes, determine sex in some species. Our model shows the sex developing in harsher conditions becomes more numerous in the population, impacting population dynamics.

Area of Science:

Evolutionary Biology
Population Genetics
Environmental Science

Background:

Sex determination can be influenced by genetic or environmental factors.
Understanding the evolutionary implications of environmental sex determination is crucial for population dynamics.

Purpose of the Study:

To model the relationship between environmental conditions and sex determination.
To predict the relative abundance of sexes based on environmental favorability.
To explore the link between resource allocation and population sex ratios.

Main Methods:

Development of a theoretical model.
Analysis of sex determination based on environmental variables.
Mathematical modeling of population sex ratios and resource allocation.

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Main Results:

A model predicting that the sex developing under less favorable environmental conditions will be more abundant.
No clear prediction regarding resource allocation to the sexes.
The predicted numerical bias is contingent on a monotonic relationship between fitness and the environmental variable influencing sex.

Conclusions:

Environmental sex determination can lead to biased population sex ratios.
The model highlights the interplay between environmental cues, sex determination, and population structure.
Further research is needed to understand resource allocation strategies in environmentally sex-determined populations.