Parent-offspring conflict: A case of arrested development

Area of Science:

• Evolutionary biology
• Behavioral ecology

Background:

• Parent-offspring conflict (POC) theory offers an evolutionary explanation for behavioral discord between parents and offspring.
• While extensively modeled, POC's phenotypic predictions lack empirical validation.
• The theory's prevalence may stem from a lack of alternative explanations for parent-offspring interactions.

Purpose of the Study:

• To evaluate the empirical support for the theory of parent-offspring conflict.
• To identify areas where POC predictions are clearer and subject to testing.
• To suggest future research directions for a more robust understanding of POC.

Main Methods:

• Review of existing literature on parent-offspring conflict.
• Analysis of experimental evidence from taxa with significant offspring influence (e.g., insects).
• Comparison of POC with alternative explanations for observed conflicts.

Main Results:

• Empirical testing of POC predictions remains limited and often ambiguous, particularly in birds and mammals.
• Cases involving significant offspring control, such as in bee colonies, offer clearer insights.
• Worker bees' manipulation of brood sex ratios contrasts with queen's interests, providing a testable POC scenario.

Conclusions:

• The theory of parent-offspring conflict requires more rigorous empirical testing across diverse taxa.
• Future research should focus on species where offspring exert substantial influence and employ field-oriented modeling.
• A pluralistic approach, reassessing fundamental assumptions, is crucial for advancing POC theory.