Geographical variation in circadian eclosion rhythm and photoperiodic adult diapause in Drosophila littoralis

The time measuring system of Drosophila littoralis originating between 40-70 degree N was found to be highly variable and latitude dependent. Diapause was not correlated with any parameters of the eclosion rhythm in the analysis. Diapause may still be influenced by the period of the eclosion rhythm, even though its minor contribution may be masked by a more variable, eclosion, rhythm independent system in the determination of diapause.