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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...

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Selection for increased allocation to offspring number under environmental unpredictability.

¹Department of Biology, Carleton University, Ottawa, ON, Canada. asimons@ccs.carleton.ca

Journal of Evolutionary Biology

|February 20, 2007

Summary

Increased offspring number offers a direct evolutionary advantage by enhancing parental fitness and achieving bethedging diversification strategies in unpredictable environments.

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Area of Science:

Evolutionary biology
Life-history theory
Ecology

Background:

Life-history theory posits a trade-off between offspring size and number.
Current models primarily focus on offspring size, treating number as a consequence.
The direct evolutionary advantage of offspring number in unpredictable environments remains under-explored.

Purpose of the Study:

To investigate the direct evolutionary advantage of increased offspring number.
To explore the role of offspring number in diversification strategies under environmental unpredictability.
To determine if environmental uncertainty directly selects for higher offspring numbers.

Main Methods:

Utilized sampling theory to analyze bethedging diversification strategies.
Employed a simulation model to assess geometric mean fitness.
Examined evolutionary pressures under variable environmental conditions.

Main Results:

Sampling theory predicts more reliable bethedging with increased offspring number.
Simulation models demonstrate higher geometric mean fitness with greater offspring numbers in uncertain environments.
Environmental unpredictability directly favors increased offspring number.

Conclusions:

Offspring number has a direct evolutionary advantage, not just as an outcome of trade-offs.
Environmental unpredictability selects for strategies that increase offspring number.
This finding highlights a previously unrecognized factor in parental fitness and diversification.