Present-day genetic correlations and testing the aerobic capacity model

Area of Science:

• Evolutionary biology
• Physiology
• Genetics

Background:

• The aerobic capacity model proposes that increased aerobic capacity drove the evolution of endothermy (warm-bloodedness).
• Nespolo and Roff (2024) questioned the support for this model based on current genetic correlations between resting and maximal metabolic rates.
• This critique may be misleading due to the model's specific genetic architecture predictions.

Purpose of the Study:

• To re-evaluate the significance of genetic correlations in testing the aerobic capacity model for endothermy.
• To clarify the implications of present-day genetic correlations for the evolutionary model.

Main Methods:

• The study critically analyzes the theoretical predictions of the aerobic capacity model regarding genetic architecture.
• It discusses the interpretation of genetic correlation data in the context of evolutionary models.

Main Results:

• The presence of a genetic correlation does not confirm the aerobic capacity model.
• However, the absence of such a correlation would definitively falsify the model.
• Current tests for genetic correlations remain a valuable approach.

Conclusions:

• Testing for genetic correlations between metabolic rates is crucial for evaluating the aerobic capacity model.
• Further research is needed to either falsify or gain confidence in the model through empirical data.