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Brood guarding in a bethylid wasp
Author(s) -
HARDY IAN C. W.,
BLACKBURN TIM M.
Publication year - 1991
Publication title -
ecological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.865
H-Index - 81
eISSN - 1365-2311
pISSN - 0307-6946
DOI - 10.1111/j.1365-2311.1991.tb00192.x
Subject(s) - biology , brood , fecundity , parasitoid , zoology , hymenoptera , offspring , survivorship curve , larva , ecology , pupa , parasitism , host (biology) , demography , population , pregnancy , genetics , cancer , sociology
.1 Atypical of the parasitoid Hymenoptera, female Goniozus nephantidis Muesebeck remain with offspring until they pupate. This behaviour will only have evolved if the consequent reduction in fecundity is outweighed by fitness returns. 2 G.nephantidis competes for hosts with conspecific and non‐conspecific parasitoids. The effectiveness of G.nephantidis at deterring superparasitism and multiparasitism is tested. Brood survivorships were compared when G.nephantidis and Bracon hebetor Say intrude on hosts with the mother present and absent and with offspring at different developmental stages. 3 Laying by the intruder reduced brood survivorship. Guarding reduced oviposition on unparasitized hosts by intruding females, and prevented superparasitism of hosts with egg broods. Hosts with larval broods were rarely superparasitized. Multiparasitism was common except on hosts with guarded larval broods, but even here survivorship was reduced. 4 Competitive asymmetries determined the outcome of contests for possession of host resources. 5 The costs of remaining seem at least partially offset by the prevention of oviposition by competing parasitoids.