Randomized trial tests offspring sex ratio influence by parental condition in contrasting kinship systems, suggesting varying effects across ecological contexts.
Key Points
The study aims to examine how parental investment in offspring sex ratio varies with parental condition across different kinship systems.
Analyzed data from 2,684 adults regarding offspring information, income, occupation, and education.
Utilized Generalized Linear Models (GLMs) with a binomial distribution and logit link function.
Exploited contrasting kinship systems of the Pumi and Han in western China.
Partial support for the Trivers-Willard hypothesis observed in the Han kinship system.
Evidence that kinship systems may complicate or obscure Trivers-Willard effects noted in the Pumi.
Variability in the importance of parental condition measures identified across different ecological settings.