A stochastic version of the Price equation reveals the interplay of deterministic and stochastic processes in evolution
2008
A Stochastic Version of the Price Equation in Evolution
publication
Evidence: high
Author Information
Author(s): Sean H. Rice
Primary Institution: Texas Tech University
Hypothesis
How do deterministic and stochastic processes interact in evolutionary change?
Conclusion
Directional evolution is influenced by the entire distribution of individual fitness, not just the mean and variance.
Supporting Evidence
- Stochastic variation in fitness amplifies the effects of selection in small or fluctuating populations.
- Populations are pulled towards phenotypes with minimum symmetrical variation in fitness.
- An odd-moment effect pulls populations towards phenotypes with maximum positive asymmetry in fitness.
Takeaway
This study shows that evolution is affected by both predictable and random factors, and that randomness can actually make selection stronger.
Methodology
The study presents a general equation for directional evolutionary change that incorporates both deterministic and stochastic processes.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website