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Reversal of pupal diapause in Sarcophaga argyrostoma by temperature shifts after puparium formation

, : Reversal of pupal diapause in Sarcophaga argyrostoma by temperature shifts after puparium formation. Journal of Insect Physiology 21(6): 1179-1186

Puparia from larvae of Sarcophaga argyrostoma (R.-D.) reared under short-day conditions (L:D 10:14) were collected daily within 24 h of their formation and divided into two groups: one that remained at the larval rearing temperature and one that was transferred to a different temperature. Such temperature shifts after puparium formation can modify the subsequent incidence of pupal diapause. Temperature step-ups decrease the percentage of diapause; temperature step-downs increase it. The degree of this effect increases with the size of the temperature step. The effectiveness of a temperature step-up declines with increasing time after puparium formation. The percentage of diapause finally achieved in any group is a function of both the number of inductive (short-day) photoperiods experienced during larval life and the magnitude and direction of the subsequent temperature step. Temperature step-ups can permit the expression of photoperiodic information that would otherwise be masked. A model is presented to account for these findings.


PMID: 1133489

DOI: 10.1016/0022-1910(75)90085-2

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