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Related Experiment Video

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Why the Shaw-Mohler equation works and when it doesn't.

¹Department of Biology, Indiana University Herbarium, Indiana University, Bloomington, IN, USA.

Biology Letters

|February 27, 2024

Summary

Fitness gain curves can misrepresent sex allocation theory by bypassing mating processes. True fitness equality requires balanced investment in male and female functions, not just gain curves.

Keywords:

hermaphrodite reproductive ecology sex allocation sex ratio

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Area of Science:

Evolutionary Biology
Sex Allocation Theory

Background:

The Shaw-Mohler equation is foundational to sex allocation theory, modeling populations based on male and female numbers.
Frequency-dependent selection on the sex ratio is influenced by the rare-sex advantage.

Purpose of the Study:

To re-examine the Shaw-Mohler equation and the role of fitness gain curves.
To clarify the interpretation of gain curves in reproductive ecology and their relation to sex allocation.

Main Methods:

Analysis of the Shaw-Mohler equation framework.
Integration and critique of fitness gain curves within the existing theoretical model.

Main Results:

Fitness gain curves, when substituted into the Shaw-Mohler equation, bypass mating processes, potentially causing anomalies.
Equal total male and female fitness necessitates a constant sex allocation with equal resource investment.

Conclusions:

Gain curves can depict specific reproductive ecologies but do not causally determine sex allocation.
Misinterpretation arises from conflating input (resource investment) with output (fitness outcome).