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Recent studies of several species have reported a latitudinal cline in the circadian clock gene,  Clock , which influences rhythms in both physiology and behavior. Latitudinal variation in this gene may hence reflect local adaptation to seasonal variation. In some bird populations, there is also an among-individual association between  Clock  poly-Q genotype and clutch initiation date and incubation period. We examined  Clock  poly-Q allele variation in the Barn Swallow ( Hirundo rustica ), a species with a cosmopolitan geographic distribution and considerable variation in life-history traits that may be influenced by the circadian clock. We genotyped Barn Swallows from five populations (from three subspecies) and compared variation at the  Clock  locus to that at microsatellite loci and mitochondrial DNA (mtDNA). We found very low variation in the  Clock  poly-Q region, as >96% of individuals were homozygous, and the two other alleles at this locus were globally rare. Genetic differentiation based on the  Clock  poly-Q locus was not correlated with genetic differentiation based on either microsatellite loci or mtDNA sequences. Our results show that high diversity in  Clock  poly-Q is not general across avian species. The low  Clock  variation in the background of heterogeneity in microsatellite and mtDNA loci in Barn Swallows may be an outcome of stabilizing selection on the  Clock  locus.

Low Variation in the Polymorphic Clock Gene Poly-Q Region Despite Population Genetic Structure across Barn Swallow (Hirundo rustica) Populations