Resistance is costly: trade-offs between immunity, fecundity and
survival in the pea aphid Gwynn, D. M., Callaghan, A., Gorham,
J., Walters, K. F. A. and Fellowes, M. D. E. (2005) Resistance
is costly: trade-offs between immunity, fecundity and survival
in the pea aphid. Proceedings of the Royal Society B-Biological
Sciences, 272 (1574). pp. 1803-1808. ISSN 1471-2954 Full text
not archived in this repository. To link to this article DOI:
10.1098/rspb.2005.3089 Parasitoids are among the most important
natural enemies of insects in many environments. Acyrthosiphon
pisum, the pea aphid, is a common pest of the leguminous crops
in temperate regions. Pea aphids are frequently attacked by a
range of endoparasitic wasps, including the common aphidiine,
Aphidius ervi. Immunity to parasitoid attack is thought to
involve secondary symbiotic bacteria, the presence of which is
associated with the death of the parasitoid egg. It has been
suggested that there is a fecundity cost of resistance, as
individuals carrying the s