Evolution of Sex Differences in Trait- and Age-Specific Vulnerabilities

Area of Science:

• Evolutionary biology
• Developmental psychology
• Toxicology

Background:

• Reproductive traits signal resilience to environmental challenges like disease and nutrition.
• These traits are vulnerable to man-made toxins and environmental stressors.
• Sex- and age-specific differences in trait vulnerability are expected.

Purpose of the Study:

• To review the dynamics of trait sensitivity to stressors.
• To predict sex-, age-, and trait-specific vulnerabilities in sexually reproducing species.
• To illustrate these vulnerabilities in nonhuman and human examples.

Main Methods:

• Review of existing literature on trait evolution and stressor impacts.
• Theoretical framework for predicting vulnerability based on competition and mate choice dynamics.
• Illustrative examples from nonhuman species and human development.

Main Results:

• Reproductive trait sensitivity to stressors is a general principle across species.
• Vulnerabilities manifest in physical growth, behavior, personality, and cognitive abilities.
• Specific examples highlight age- and sex-dependent disruptions.

Conclusions:

• Trait sensitivity to stressors has significant implications for understanding health and development.
• The framework allows for a priori predictions of vulnerability.
• Further research is needed to refine understanding and develop interventions for vulnerable traits.