Title page for ETD etd-07282008-152417

Document Type Master's Dissertation
Author Jansen van Vuuren, Gert Johannes
URN etd-07282008-152417
Document Title Development and use of microsatellites to quantify the mating system of the pollinating fig wasp, Platyscapa awekei
Degree MSc(Agric)
Department Genetics
Advisor Name Title
Dr P Kruger Committee Co-Chair
Prof J M Greeff Supervisor
  • mating system
  • Platyscapa awekei
  • fig wasp
  • mating behaviour
Date 2005-09-07
Availability unrestricted
Mating system, mating behavior and the evolution thereof is the foundation of this study. More specifically the effect of inbreeding on the evolution of mating behavior is investigated. To this end the pollinating fig wasp, Platyscapa awekei, lends itself to inquiry about inbreeding and the effect on its behavior.

A pollinating fig wasp female will lay her eggs inside a syconium, and all offspring will mate with each other. Interestingly the abovementioned pollinating wasp exhibits male dispersal, not commonly expected to occur in a haplodiploid species observed to inbreed frequently.

Several theories attempt to explain the evolution of male dispersal in this case, but very little work has been done on the effect of inbreeding on the choice to disperse. In order to study the effects of inbreeding it was necessary to be able to measure the inbredness of individuals. For this reason I developed micro satellite markers both to determine the inbredness of individuals but also to derive parentage from offspring genotypes. With the inbreeding status in hand I had to correlate this with fitness measures in order to derive the effect of inbreeding on this species.

Interestingly I found both inbreeding and outbreeding depression, with optimal fitness at some point between fully inbred and fully outbred status. I give some explanations for the occurrence of dispersal in this species but come to the conclusion that dispersal is merely part of a mixed mating system and that more detailed work need to be done to derive what the specific effect of dispersal is on fitness.

2005 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.

Please cite as follows:

Jansen van Vuuren, GJ 2005, Development and use of microsatellites to quantify the mating system of the pollinating fig wasp, Platyscapa awekei, MSc(Agric) dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-07282008-152417/ >


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