Table 1.
Allele frequencies and observed heterozygosity (H) for the Clock gene in 922 adult barn swallows.
Table 2.
Observed and expected (after Levene’s correction) genotype frequencies of the Clock gene for 922 adult barn swallows.
Figure 1.
Mean (+ s.e.) breeding date of the genotypes in the sex by age classes of the barn swallow.
Numbers in the body of the graphs are sample sizes. Breeding date data of the single Q7/Q8 older female or male (denoted by 1*) are reported for completeness but are not included in the statistical analyses. The difference between yearling female Q7/Q7 and Q7/Q8 was significant (P < 0.05, see Results).