(3) Heterozygosity-based mate choice
To test if titis show any heterozygosity-based mating pattern, we compared individual heterozygosity levels between pair mates. To estimate individual heterozygosity, we calculated homozygosity by loci (HL), a microsatellite-derived measure that weights the contribution of each locus to the homozygosity value depending on their allelic variability, implemented in R function GENHET 3.1 (Coulon, 2010). To test if HL is correlated between pair mates, we used a two-tailed Pearson correlation analysis.