Anthropogenic cover: proportion of anthropogenic areas within a 500-m wide belt zone around the pond. For further land-use data and geographical coordinates, see Table S1.

?? male: number of phenotypic males for which genetic sex could not be identified. Out of these, 2 were XX based on Rds3 and XY based on Rds1, while Rds1 genotyping failed in the other 8 individuals (all were XX based on Rds3).

^a N=8 families from each site.

^b N=18 families; sex-reversed individuals were found in 2 families.

^c In total, 5 males and 5 females captured at these 3 sites were used for marker finding.