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Flexible diet choice offsets protein costs of pathogen resistance in a caterpillar.

Lee, K. P. and Cory, J. S. and Wilson, Kenneth and Raubenheimer, D. and Simpson, S. J. (2006) Flexible diet choice offsets protein costs of pathogen resistance in a caterpillar. Proceedings of the Royal Society of London Series B, 273 (1588). pp. 823-829. ISSN 0962-8452

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Abstract

Mounting effective resistance against pathogens is costly in terms of energy and nutrients. However, it remains unexplored whether hosts can offset such costs by adjusting their dietary intake so as to recoup the specific resources involved. We test this possibility by experimentally challenging caterpillars (Spodoptera littoralis) with a highly virulent entomopathogen (nucleopolyhedrovirus), under dietary regimes varying in the content of protein and digestible carbohydrate. We found that dietary protein influenced both resistance to pathogen attack and constitutive immune function to a greater extent than did dietary carbohydrate, indicating higher protein costs of resistance than energy costs. Moreover, when allowed to self-compose their diet, insects surviving viral challenge increased their relative intake of protein compared with controls and those larvae dying of infection, thus demonstrating compensation for protein costs associated with resistance. These results suggest that the change in the host's nutritional demands to fight infection induces a compensatory shift in feeding behaviour.

Item Type: Article
Journal or Publication Title: Proceedings of the Royal Society of London Series B
Uncontrolled Keywords: costs of resistance ; feeding behaviour ; immunity ; nutrition ; pathogen infection
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 8990
Deposited By: Dr Kenneth Wilson
Deposited On: 20 May 2008 16:03
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:29
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/8990

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