none Callosobruchus chinensis; FECUNDITY-; HATCHING-SUCCESS; HYMENOPTERAN-PARASITES; Heterospilus prosopidis; Host/parasitoid system development & persistence, effect of temperature; POPULATION-DENSITY; Density dependant population growth; Temperature & hymenopteran parasite relationships; TEMPERATURE-; Host/hymenopteran parasitoid system development & persistence relationships Heterospilus prosopidis; DEVELOPMENT-; Developmental period within coleopteran host; COLEOPTERAN-HOSTS; Callosobruchus chinensis; Host/parasitoid system development & persistence, effect of temperature; TEMPERATURE-; Coleopteran host/parasitoid system development & persistence relationships In experimental systems of a bruchid host, Callosobruchus chinensis, and a braconid parasitoid, Heterospilus prosopidis, the effects of changes in developmental schedules were examined in relation to the persistence of the system, or the time to extinction of a component species. We modified the developmental schedules by changing the temperature from 30 degree C to 32 degree C. To compare persistence, a long-term system with overlapping generations was set up and the bruchid host resource, azuki beans (Vigna angularis), were renewed every 10 days. The long-term systems showed greater persistence at 30 degree C than at 32 degree C. Parasitoid extinction was often observed. We examined differences in life-history characteristics of the component species between the two temperatures by short-term, single-generation experiments. Fecundity and egg hatchability of the host were reduced and the developmental period of the parasitoid was shortened at 32 degree C. The age at which the host became vulnerable to parasitoid attacks was earlier at 32 degree C than at 30 degree C. We constructed a daily based, age-structured model to analyse which life-history change(s) affected the persistence of the long-term systems. The density-dependent population growth of the host was described by a logistic equation and the attack rate of the parasitoid by a type II functional response with mutual interference. The simulation results showed greater persistence at 30 degree C than at 32 degree C. Sensitivity analysis showed that there are threshold boundaries in the length of the vulnerable period of the host beyond which system persistence drastically changes. Further, persistence at another temperature, 28 degree C, was predicted using a model based on short-term data on the host.