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OBSERVATIONS ON INTRASPECIFIC LARVAL COMPETITION IN THREE HYMENOPTEROUS PARASITES OF FLY PUPARIA

Published online by Cambridge University Press:  31 May 2012

H. G. Wylie
H. G. Wylie
Affiliation:
Research Institute, Canada Department of Agriculture, Belleville, Ontario
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Abstract

Though they may hatch on any part of a housefly (Musca domestica L.) pupa, most larvae of Nasonia vitripennis (Walk.) and Muscidifurax raptor G. & S. (Hymenoptera: Pteromalidae) move to the host’s ventral abdominal area, and those of Spalangia cameroni Perk. (Hymenoptera: Pteromalidae) to the dorsal side of the abdomen, before feeding extensively. As many as 25 larvae of N. vitripennis can mature on a medium-sized housefly pupa; if more are present initially, those that hatch last usually die from starvation after the host has been consumed. In contrast, usually only one larva of M. raptor or S. cameroni matures on a host; this is often the larva that hatches first, because it attacks all parasite eggs that it encounters while moving over the fly pupa soon after hatching. Larval crowding in M. raptor or S. cameroni, unlike that in N. vitripennis, does not affect the sex ratio of the survivors.

Type
Articles
Information
The Canadian Entomologist , Volume 103 , Issue 1 , January 1971 , pp. 137 - 142
Copyright
Copyright © Entomological Society of Canada 1971

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