Clonal variation and covariation in aphid resistance to parasitoids and a pathogen
Clonal variation and covariation in aphid resistance to parasitoids and a pathogen
The potential rate of evolution of resistance to natural enemies depends on the genetic variation present in the population and any trade-offs between resistance and other components of fitness. We measured clonal variation and covariation in pea aphids (Acyrthosiphon pisum) for resistance to two parasitoid species (Aphidius ervi and A. eadyi) and a fungal pathogen (Erynia neoaphidis). We found significant clonal variation in resistance to all three natural enemies. We tested the hypothesis that there might be trade-offs (negative covariation) in defensive ability against different natural enemies, but found no evidence for this. All correlations in defensive ability were positive, that between the two parasitoid species significantly so. Defensive ability was not correlated with fecundity. A number of aphid clones were completely resistant to one parasitoid (A. eadyi), but a subset of these failed to reproduce subsequently. We discuss the factors that might maintain clonal variation in natural enemy resistance.
coevolution, entomopathogen, evolution of resistance, genetic variation, parasitoid, pea aphid, trade-off
1805-1814
Ferrari, Julia
5c1f3500-81f1-4dbb-b6d5-41958373d35d
Muller, Christine B.
8e158b64-7808-411d-b97e-abd89fd58039
Kraaijeveld, Alex R.
4af1791a-15cf-48b9-9fd8-b3a7fb450409
Godfray, H. Charles J.
69326e74-4061-42de-9cf4-540ed7563a01
1 September 2001
Ferrari, Julia
5c1f3500-81f1-4dbb-b6d5-41958373d35d
Muller, Christine B.
8e158b64-7808-411d-b97e-abd89fd58039
Kraaijeveld, Alex R.
4af1791a-15cf-48b9-9fd8-b3a7fb450409
Godfray, H. Charles J.
69326e74-4061-42de-9cf4-540ed7563a01
Abstract
The potential rate of evolution of resistance to natural enemies depends on the genetic variation present in the population and any trade-offs between resistance and other components of fitness. We measured clonal variation and covariation in pea aphids (Acyrthosiphon pisum) for resistance to two parasitoid species (Aphidius ervi and A. eadyi) and a fungal pathogen (Erynia neoaphidis). We found significant clonal variation in resistance to all three natural enemies. We tested the hypothesis that there might be trade-offs (negative covariation) in defensive ability against different natural enemies, but found no evidence for this. All correlations in defensive ability were positive, that between the two parasitoid species significantly so. Defensive ability was not correlated with fecundity. A number of aphid clones were completely resistant to one parasitoid (A. eadyi), but a subset of these failed to reproduce subsequently. We discuss the factors that might maintain clonal variation in natural enemy resistance.
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Submitted date: 2 December 2000
Published date: 1 September 2001
Keywords:
coevolution, entomopathogen, evolution of resistance, genetic variation, parasitoid, pea aphid, trade-off
Identifiers
Local EPrints ID: 32816
URI: http://eprints.soton.ac.uk/id/eprint/32816
ISSN: 0014-3820
PURE UUID: b23d50e9-3528-4461-9461-e706e2b54957
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Date deposited: 12 May 2006
Last modified: 16 Mar 2024 03:48
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Author:
Julia Ferrari
Author:
Christine B. Muller
Author:
H. Charles J. Godfray
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