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Host-size-dependent sex ratios among parasitoid wasps: does host growth matter?

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Summary

Waage's (1982) hypothesis that host-size-dependent sex ratios will occur in parasitoids of nongrowing hosts and not in parasitoids of growing hosts is examined using published data on parasitoid wasps. Waage's hypothesis is supported as a general, but not absolute, rule: among solitary parasitoid wasps, a significantly greater proportion of parasitoids of nongrowing than of growing hosts show some evidence of host-size-dependent sex ratios (85% versus 42%, G=6.54, P< 0.05). The premise of Waage's hypothesis-that for parasitoids which develop in a growing stage, host size at oviposition is not a good predictor of the amount of resources available to the developing parasitoid-is also examined. It is suggested that across host species Waage's premise will hold for some, but not all, parasitoids of growing hosts. Likely exceptions to Waage's premise, and thus his prediction, are discussed. Parasitoids of growing hosts which are expected to have evolved hostsize-dependent sex ratios include parasitoids which utilize a narrow size range of host species, parasitoids which can distinguish among host species by some criterion other than size, and parasitoids which utilize host species whose susceptible instars do not overlap in size.

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  1. B. H. King

    Present address: Department of Biology, Indiana University, 47405, Bloomington, IN, USA

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  1. Department of Biological Sciences, University of Cincinnati, 45221, Cincinnati, OH, USA

    B. H. King

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King, B.H. Host-size-dependent sex ratios among parasitoid wasps: does host growth matter?. Oecologia 78, 420–426 (1989). https://doi.org/10.1007/BF00379119

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