Figure 7.

Diapause incidence in response to different day and night lengths under different T‐cycles in Nasonia vitripenis, Sarcophaga argyrostoma and Tetranychus urticae. The data reported were extracted from old Nanda–Hamner studies in the parasitic wasp N. vitripenis (Saunders, 1974), the flesh fly S. argyrostoma (Saunders, 1973) and the spider mite T. urticae (Vaz Nunes & Veerman, 1986). These studies conducted Nanda–Hamner experiments using a range of photoperiod conditions, thus allowing us to extract diapause incidence for more than one combination of photoperiods and night lengths for each LD periodicity. The extracted diapause incidence data were then plotted as a function of day length (A, C, E) and night length (B, D, F). Distinct line‐types and symbols in each plot represent different T‐cycle periods.