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In search of clinal variation in the period and clock timing genes in Australian Drosophila melanogaster populations

Clinal variation for repeat number in the Thr‐Gly region of the period circadian timing gene in Drosophila melanogaster was described in Europe and has subsequently been used as evidence of thermal selection on period alleles. To test for clinal variation in this gene along the east coast of Australia, the period polymorphism was scored on flies from multiple samples collected repeatedly over a 5‐year interval, along with variation at another circadian rhythm locus, clock. For period, there was no consistent evidence of clinal variation in the 17 and/or 20 repeat alleles, although when average allele length was examined a weak consistent clinal pattern was detected. For clock there was no evidence of clinal variation in the two most common alleles or in average repeat size. These data are inconsistent with the reported patterns in Europe and suggest that clinal variation in timing genes needs to be re‐examined in this region.