Abstract
Parasitoid researchers have generally thought that the body size of the mother parasitoid does not affect the fitness performance of the progeny during the immature stage, as long as the progeny develop in the same environment. We reveal for the first time that this is not true for the parasitoid Echthrodelphax fairchildii (Hymenoptera: Dryinidae), which is parasitic on planthoppers. Large females ensured an increased survival rate for their progeny during the immature stage and a large body size at adult emergence. Maternal body size differentially affected the body sizes and survival rates of male and female progeny. Small females did not produce female progeny, and the survival rate of the female progeny increased more steeply with increasing maternal body size than that of the male progeny. Meanwhile, the body size of male progeny increased more steeply with increasing maternal body size. The influence of maternal body size on progeny survival to adult emergence has never been reported in insects before. In addition, large females were more likely to lay female eggs, suggesting that females control the sex ratio of progeny in response to their own body size.
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The authors thank Takahito Kuroda for helping with the preliminary experiment.
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Communicated by: Matthias Waltert
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Herlin, W., Yoshimura, H. & Yamada, Y.Y. Large mothers produce progeny with high survival rates during the immature stage and large sizes at adulthood in a parasitoid species. Sci Nat 106, 52 (2019). https://doi.org/10.1007/s00114-019-1648-3
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DOI: https://doi.org/10.1007/s00114-019-1648-3