Re-use of this article is permitted in accordance with the Terms and Conditions set out at http://wileyonlinelibrary.com/onlineopen#OnlineOpen_Terms
Prey-mediated effects of glucosinolates on aphid predators
Article first published online: 6 MAY 2011
© 2011 The Authors. Ecological Entomology © 2011 The Royal Entomological Society
Volume 36, Issue 3, pages 377–388, June 2011
How to Cite
KOS, M., KABOUW, P., NOORDAM, R., HENDRIKS, K., VET, L. E. M., VAN LOON, J. J. A. and DICKE, M. (2011), Prey-mediated effects of glucosinolates on aphid predators. Ecological Entomology, 36: 377–388. doi: 10.1111/j.1365-2311.2011.01282.x
- Issue published online: 6 MAY 2011
- Article first published online: 6 MAY 2011
- Accepted 12 March 2011
- Brevicoryne brassicae;
- Chrysoperla carnea;
- Episyrphus balteatus;
- Intraspecific variation;
- Multitrophic interactions;
- Myzus persicae
1. Plant resistance against herbivores can act directly (e.g. by producing toxins) and indirectly (e.g. by attracting natural enemies of herbivores). If plant secondary metabolites that cause direct resistance against herbivores, such as glucosinolates, negatively influence natural enemies, this may result in a conflict between direct and indirect plant resistance.
2. Our objectives were (i) to test herbivore-mediated effects of glucosinolates on the performance of two generalist predators, the marmalade hoverfly (Episyrphus balteatus) and the common green lacewing (Chrysoperla carnea) and (ii) to test whether intraspecific plant variation affects predator performance.
3. Predators were fed either Brevicoryne brassicae, a glucosinolate-sequestering specialist aphid that contains aphid-specific myrosinases, or Myzus persicae, a non-sequestering generalist aphid that excretes glucosinolates in the honeydew, reared on four different white cabbage cultivars. Predator performance and glucosinolate concentrations and profiles in B. brassicae and host-plant phloem were measured, a novel approach as previous studies often measured glucosinolate concentrations only in total leaf material.
4. Interestingly, the specialist aphid B. brassicae selectively sequestered glucosinolates from its host plant. The performance of predators fed this aphid species was lower than when fed M. persicae. When fed B. brassicae reared on different cultivars, differences in predator performance matched differences in glucosinolate profiles among the aphids.
5. We show that not only the prey species, but also the plant cultivar can have an effect on the performance of predators. Our results suggest that in the tritrophic system tested, there might be a conflict between direct and indirect plant resistance.