Abstract
In solitary parasitoids, in which only one individual can emerge per host, the adaptive value of conspecific superparasitism is a function of the survival probability of the egg laid by the superparasitizing female. In the few cases which these probabilities are compared, the oldest immature has an advantage over the other individuals. We measured the acceptance rate of parasitized hosts and survival rate of supernumerary larvae in Anaphes victus (Hymenoptera: Mymaridae) in relation to the interval between ovipositions. When this interval was 5–7 days, the first immature was at the prepupa and pupa stage respectively, and female Anaphes victus changed their oviposition behavior markedly. They killed the developing parasitoid of their own species before ovipositing in it. The progeny of these females, which are normally primary parasitoids, developed thereafter as hyperparasitoids. Indeed, in contrast with other species, the survival of the second female's progeny increased with the time interval between ovipositions. This type of facultative intraspecific hyperparasitism is different from autoparasitism in Aphelinidae and has never been mentioned in other parasitoids; it would be adaptive if females of this short-lived species encounter low-quality patches.
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Communicated by M.A. Elgar
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van Baaren, J., Boivin, G. & Nénon, J.P. Intraspecific hyperparasitism in a primary hymenopteran parasitoid. Behav Ecol Sociobiol 36, 237–242 (1995). https://doi.org/10.1007/BF00165832
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DOI: https://doi.org/10.1007/BF00165832