Geographical variation of photoperiodic adult diapause in Drosophila auraria.

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Abstract
The variation of photoperiodic adult diapause was studied in D. auraria strains originating in Japan at latitudes from 33.8-43.1.degree. N. All the differently-located geographical strains showed a photoperiodic diapause. The critical daylength of these strains fell between 12 and 14 h. The diapause intensity increases with an increase in latitudes. The duration of diapause was shorter at a photoperiod of 12 or 6 h than at 1 of 10 or 8 h in all the strains. The photoperiod of 12 or 6 h is less effective as a stimulus for the maintenance of diapause.