A generalised approach to the study and understanding of adaptive evolution

Area of Science:

• Evolutionary biology
• Genetics
• Ecology

Background:

• Mainstream evolutionary theory faces challenges incorporating phenomena like epigenetic inheritance and niche construction.
• Existing frameworks may not fully capture the complexity of adaptive evolution.
• There is a need to broaden the scope of evolutionary theory to include diverse inheritance and adaptation mechanisms.

Purpose of the Study:

• To develop a generalized framework for adaptive evolution.
• To integrate non-genetic inheritance, extended phenotypes, and trait interactions into evolutionary theory.
• To provide a causal model for understanding adaptive evolution beyond genetic change.

Main Methods:

• Utilized causal modeling to integrate key aspects of adaptive evolution.
• Incorporated broadened views of extended phenotypes, trait responses, and non-genetic inheritance.
• Applied the Price equation to model natural selection and non-genetic inheritance.

Main Results:

• Identified natural selection and non-genetic inheritance of parental responses as independent drivers of adaptive evolution.
• Demonstrated that non-genetic inheritance is captured by a component of the Price equation.
• Developed a flexible causal model applicable to various research questions and biological systems.

Conclusions:

• A generalized approach to adaptive evolution can be achieved by incorporating non-genetic inheritance, extended phenotypes, and trait interactions.
• The proposed causal model offers a heuristic tool for clarifying conceptual issues and guiding empirical research.
• Evolution should be viewed as a change in the entire causal structure, including genetic, phenotypic, and environmental variables, not solely genetic change.