Optimality Models and the Propensity Interpretation of Fitness

Area of Science:

• Evolutionary Biology
• Philosophy of Science

Background:

• The propensity account of fitness defines fitness as a disposition.
• This definition aims to resolve the tautologicity issue in evolutionary theory.
• Operational independence from actual reproductive success is crucial to avoid circularity.

Purpose of the Study:

• To critically evaluate the use of optimality models for operationalizing fitness.
• To demonstrate the unsoundness of a common procedure for achieving operational independence.
• To propose a revised understanding of optimality models in evolutionary contexts.

Main Methods:

• Analysis of the logical structure of fitness operationalization via optimality models.
• Development of two independent lines of reasoning to demonstrate unsoundness.
• Conceptualization of an alternative account for the role of optimality models.

Main Results:

• A key procedure for operationalizing fitness using optimality models is shown to be unsound.
• The proposed method for achieving operational independence is flawed.
• Existing approaches may lead to circularity and vacuousness.

Conclusions:

• The current application of optimality models in measuring fitness requires revision.
• A new framework is needed to correctly integrate optimality models into evolutionary analysis.
• This work impacts the philosophical foundations of evolutionary biology.