Field and laboratory experiments showed that under certain conditions adult females of the predator Jalysus spinosus (Say) have a facultative reproductive diapause in North Carolina. Diapausing females appeared in the Oxford, NC area in late August, as day length declined to 13.5h and less. In the laboratory at 26.7°C, the percentage incidence of diapause rose abruptly from ca. 9% at 13.5 photophase to 98% at 12.5 h. The diapause-induction curve was a Type III shape, with 0% diapause at constant darkness. A long day (14 h light and 10 h dark) and warmer temperatures shortened the length of diapause.
No takes yet. Share an insight, caveat, or question.
Kent D. Elsey (1974) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: