Reproduction in a variable environment: How does Eupelmus vuilleti, a parasitoid wasp, adjust oogenesis to host availability?

摘要: Oogenesis of the parasitoid wasp Eupelmus vuilleti is known to be dependent on host availability. However, examination ovarian dynamics by microscopy showed that oogenesis and vitellogenesis are initiated before female eclosion proceed 1-2 days after, independent presence. continued beyond 2nd day only in presence hosts, otherwise it was replaced egg resorption. It thus possible distinguish between host-independent host-dependent periods oogenesis. In host, each ovariole (three per ovary) contained generally three oocytes: a fully mature oocyte, nearly one an immature one. deprived-females resorbed their most smallest oocytes, but kept almost oocyte ovariole. Comparison zero, short long deprivation females always had ability quickly lay eggs exploit any new host. increased led reduction number viability eggs. Enzymo-immunological measurements ecdysteroids were made whole females, dissected ovaries newly laid Our results indicated play major role as circulating hormones involved regulation