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Related Experiment Video

Updated: Jul 18, 2026

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Human parental effort and environmental risk.

Robert J Quinlan¹

¹Department of Anthropology, Washington State University, Pullman, WA 99164-4910, USA. rquinlan@wsu.edu

Proceedings. Biological Sciences

|December 1, 2006

Summary

Parental investment in offspring is reduced in harsh environments like famine or warfare. However, parental care shows a complex, non-linear relationship with pathogen stress, indicating adaptive strategies in response to environmental hazards.

Area of Science:

Evolutionary Anthropology
Human Behavioral Ecology
Cross-Cultural Studies

Background:

Parental investment is a key factor in offspring survival and reproductive success.
Environmental conditions, such as resource scarcity and disease prevalence, are hypothesized to influence parental effort.
Understanding these influences is crucial for explaining human behavioral diversity.

Purpose of the Study:

To test the prediction that human parental effort decreases in environments where care offers limited benefits to offspring survival.
To examine the associations between environmental hazards (famine, warfare, pathogen stress) and parental investment strategies.
To investigate potential sex-specific differences in the relationship between environmental factors and parental care.

Main Methods:

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Utilized data from the Standard Cross-Cultural Sample to analyze relationships between environmental variables and parental investment.
Employed statistical analyses to assess associations between maternal care, paternal involvement, and environmental stressors.
Investigated mediating factors, such as polygyny, in the relationship between pathogen stress and paternal involvement.

Main Results:

Maternal care showed inverse associations with famine and warfare.
A quadratic relationship was observed between maternal care and pathogen stress, with care increasing to moderate levels and then decreasing.
Paternal involvement was inversely related to pathogen stress, partially mediated by polygyny.

Conclusions:

Parental effort is adaptively adjusted in response to environmental challenges, with reduced investment in contexts of high mortality risk.
The curvilinear relationship between parental care and pathogen stress suggests a saturation point for parental benefits under high environmental hazard.
Maternal and paternal care exhibit distinct relationships with environmental hazards, likely reflecting sex-specific reproductive trade-offs.