Daily Activity of the Housefly, , Is Influenced by Temperature Independent of 3' UTR Gene Splicing.

Circadian clocks orchestrate daily activity patterns and free running periods of locomotor activity under constant conditions. While the first often depends on temperature, the latter is temperature-compensated over a physiologically relevant range. Here, we explored the locomotor activity of the temperate housefly Under low temperatures, activity was centered round a major and broad afternoon peak, while high temperatures resulted in activity throughout the photophase with a mild midday depression, which was especially pronounced in males exposed to long photoperiods. While () mRNA peaked earlier under low temperatures, no temperature-dependent splicing of the last 3' end intron was identified. The expression of , , and was also influenced by temperature, each in a different manner. Our data indicated that comparable behavioral trends in daily activity distribution have evolved in and , yet the behaviors of these two species are orchestrated by different molecular mechanisms.