A comparative study of the relationship between host size and brood size in Apanteles spp. (Hymenoptera: Braconidae)
A. D. Le MASURIER,
Corresponding Author
A. D. Le MASURIER
Department of Pure and Applied Biology, Imperial College. London University
Dr A. D. le Masurier, Department of Pure and Applied Biology, Imperial College at Silwood Park, Ascot, Berks. SLS 7PY.Search for more papers by this author
A. D. Le MASURIER,
Corresponding Author
A. D. Le MASURIER
Department of Pure and Applied Biology, Imperial College. London University
Dr A. D. le Masurier, Department of Pure and Applied Biology, Imperial College at Silwood Park, Ascot, Berks. SLS 7PY.Search for more papers by this authorAbstract
ABSTRACT. 1. Current models of insect oviposition predict that clutch size in parasitoids should correlate with host size, with a continuum from solitary species at one end to large gregarious broods at the other. This prediction is tested for the genus Apanteles (sensu lato).
2. The distribution of brood sizes in Apanteles is bimodal, with peaks at one (solitary species) and at about twenty (gregarious species).
3. Brood size of gregarious species correlates with host size, but when a measure of the total volume of a parasitoid brood is plotted against host size, solitary species do not lie on the same regression slope as gregarious species.
4. There is a relative shortage of gregarious species on small hosts, and a relative excess of solitary species on large hosts. Solitary species on large hosts do not fully consume the host resource.
5. The possible role of evolutionary constraints to adaptive progeny allocation in Apanteles is discussed.
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