Long et al. clarify the relationship between parental sex roles and the population sex ratio. They find that neither the operational sex ratio (OSR), nor the adult sex ratio (ASR), nor the maturation sex ratio (MSR) are drivers of parental sex roles.
https://www.journals.uchicago.edu/doi/10.1086/733457
#parentalsexrole — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #parentalsexrole, aggregated by home.social.