The genetic sex-determination system predicts adult sex ratios inn tetrapods

摘要

The adult sex ratio (ASR) has critical effects on behaviour, ecology and population dynamics(1,2), but the causes of variation in ASRs are unclear(3,4). Here we assess whether the type of genetic sex determination influences the ASR using data from 344 species in 117 families of tetrapods. We show that taxa with female heterogamety have a significantly more male-biased ASR (proportion of males: 0.55 +/- 0.01 (mean +/- s.e.m.)) than taxa with male heterogamety (0.43 +/- 0.01). The genetic sex-det