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Title: Behavioural aspects of foraging in the parasitoid Nemeritis canescens (Grav.)
Author: Waage, Jeffrey King
ISNI:       0000 0001 3549 4635
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1977
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An interesting problem in ecology and evolutionary biology is how foraging animals allocate their time in environments of patchily distri-buted prey. This problem is investigated in the present study with the parasitoid, Nemeritis canescens and its host, Piodia interpunctella. The primary questioned examined is what determines how long Nemeritis spends in a patch of hosts. A patch is defined as an area containing a host secretion produced during feeding which is excitatory to the parasitoid. The time spent by Nemeritis in a patch of particular host density is determined by two distinct responses, (1) a complex or th_ oU_4n etic response to the host secretion, which includes a probing response by which the concealed hosts are contacted, and (2) a klinotactic response to the disappearance of the host secretion at the edge of the patch, which causes the insect to turn back towards center. The abandonment of a patch results from the waning of responsiveness to this latter patch edge stimulus. Patch time is increased by increasing the concentration of the chemical patch stimulus (i.e., by increasing host density) by oviposition. Oviposition alters the response to the patch stimulus, and the effect of serial ovipositions is determined by their rate rather than their absolute number.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available