Group selection and kin selection: formally equivalent approaches.

Area of Science:

• Evolutionary Biology
• Behavioral Ecology
• Theoretical Biology

Background:

• Inclusive fitness theory, often summarized by Hamilton's rule, is a dominant framework for explaining the evolution of social behavior.
• A parallel theoretical approach posits that selection acting between groups is also a significant driver of social evolution.
• The mathematical equivalence between inclusive fitness theory and group selection has been established for a considerable time.

Purpose of the Study:

• To survey recent objections raised against inclusive fitness theory.
• To examine these objections in the context of established understanding of inclusive fitness.
• To clarify the relationship between inclusive fitness theory and group selection in light of contemporary critiques.

Main Methods:

• Literature review of contemporary objections to inclusive fitness theory.
• Analysis of objections concerning strong selection and non-additive fitness effects.
• Comparison of inclusive fitness theory with group selection frameworks.

Main Results:

• Recent objections incorrectly claim inclusive fitness theory cannot handle strong selection or non-additive effects.
• These identified problems have been previously addressed and resolved within the existing literature on inclusive fitness.
• The mathematical equivalence between inclusive fitness and group selection remains valid.

Conclusions:

• Contemporary objections to inclusive fitness theory are based on misunderstandings or overlooking prior resolutions.
• Inclusive fitness theory, when properly understood, can accommodate the complexities of strong selection and non-additive fitness effects.
• The group selection framework is not more general than inclusive fitness theory; they are equivalent and reconciled.