Reproductive Physiology of Dacus oleae (GMELIN) Diptera Tephritidae. Comparison of wild and Laboratory reared flies
1982
Zervas, G. (National Center for Scientific Research, "Demokritos", Aghia Paraskevi, Athens (Greece). Div. of Biology, Lab. of Entomology)
The mating activity of the olive fruit fly, Dacus oleae, is a rhythmical phenomenon, controlled by a circadian rhythm, occurring at the end of the photophase. Under continuous white light works as a free running rhythm for several days, with a periodicity of less than 24 hrs. The sexual activity, in both sexes, is controlled and synchronized by the same rhythm. The synchronization and the steady-state of the rhythm is defined by the length of the scotophase, which in fact controls the manifestation of the rhythm. Light intensity up to 45.000 lux able to mate daily for up to 40 consecutive days. Therefore about 12 hrs within the same period. The previous mating activity of males did not affect their sexual rhythm and activity, since they were able to mate daily for up to 40 consecutive days. Therefore they are characterized as polygamous. Non-irradiated males conveyed sperm to all their mating partners, most laboratory reared females, the sterilized ones were mating. Wild males mated less frequently than laboratory reared males, sterilized or not. Females, after each successful mating become sexually unreceptive for a period of several days. In fact, most females, wild or laboratory reared, sterilized or not mated twice, considerably fewer mated once and even fewer three times, thus characterized as oligogamous. Among laboratory reared females, the sterilized ones were mated more frequently than the non-sterilized, while wild females were mated less than both categories of the laboratory-reared.
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