Transfer of life-history phenology from mothers to progeny in a solitary univoltine parasitoid

Abstract

Among univoltine insects that experience diapause, differences in emergence timing between adult males and females are expected to be dictated by sex-specific developmental factors. In multivoltine insects without a diapause, there is often an additional relationship between the date of oviposition and the date of adult emergence. Differences between male and female emergence timing in the latter case can therefore be influenced by female sex-allocation decisions. In the present study, it is shown that eggs of a univoltine parasitoid wasp Diachasma alloeum Muesebeck (Hymenoptera: Braconidae) that are laid earlier also eclose earlier during the subsequent year, independent of (although complementary to) sex-related differences in development time. The implications of this pattern for sex allocation decisions by female univoltine parasitoids are discussed.