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Ecological speciation by sexual selection.

R Lande¹, M Kirkpatrick

¹Department of Biology, University of Chicago, Illinois 60637.

Journal of Theoretical Biology

|July 8, 1988

Summary

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Female mate choice can drive rapid speciation by shifting populations into new ecological niches. Genetic correlations between sexes determine if one or both sexes transition, creating distinct, coexisting species.

Area of Science:

Evolutionary biology
Quantitative genetics
Speciation research

Background:

Speciation mechanisms are crucial for understanding biodiversity.
Ecological niche availability can influence evolutionary trajectories.
Sexual selection, particularly female choice, plays a significant role in evolution.

Purpose of the Study:

To investigate a speciation mechanism driven by natural and sexual selection.
To explore how female mate choice can lead to niche shifts.
To determine the role of genetic correlations in sex-specific transitions during speciation.

Main Methods:

Utilized quantitative genetic models.
Simulated populations with multiple available ecological niches.
Incorporated female mate choice based on ecologically relevant traits.

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Main Results:

Female choice can rapidly shift populations into new ecological niches.
The genetic correlation between male and female traits dictates whether males or both sexes transition.
This process generates premating and postmating isolation barriers.

Conclusions:

Sexual selection can be a potent force in rapid speciation.
Ecological niche availability combined with sexual selection can lead to sympatric speciation.
The genetic architecture of traits influences the mode and speed of speciation.