Current address: USDA-ARS, Subtropical Horticulture Station, Miami, FL 33158, U.S.A.
Parasitism and constitutive defence costs to host life-history traits in a parasitoid–host interaction
Version of Record online: 20 OCT 2009
© 2009 The Authors. Journal compilation © 2009 The Royal Entomological Society
Volume 34, Issue 6, pages 763–771, December 2009
How to Cite
NIOGRET, J., SAIT, S. M. and ROHANI, P. (2009), Parasitism and constitutive defence costs to host life-history traits in a parasitoid–host interaction. Ecological Entomology, 34: 763–771. doi: 10.1111/j.1365-2311.2009.01131.x
- Issue online: 4 NOV 2009
- Version of Record online: 20 OCT 2009
- Accepted 18 August 2009First published online 20 October 2009
- Developmental time;
- Plodia interpunctella;
- selected populations;
- Venturia canescens
1. The level of an organism's investment in defences against natural enemies depends on the fitness costs of resisting parasitism and on the costs of maintaining defences in the absence of infection. Heritable variation in resistance suggests that costs exist, but very little is known about the nature or magnitude of these costs in natural populations of animals.
2. A powerful technique for identifying trade-offs between fitness components is the study of correlated responses to artificial selection. We selected for increased resistance in the Indian meal moth, Plodia interpunctella, following parasitism by the koinobiont parasitoid, Venturia canescens, and measured the cost of resistance to parasitism and the cost of maintaining resistance in the absence of immune challenge during the next generation.
3. Parasitism decreased larval host size, growth, and developmental time and was significantly negatively correlated with the size of surviving host adults. Larvae of the next generation also had a reduced developmental period, whilst the duration of the invulnerable pupal instar was increased. There was no effect on host adult size and related fecundity in the F1 generation.