Arthropod-Plant Interactions (2013) 7, 349-357
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Host preference of plant genotypes is altered by intraspecific competition in a phytophagous insect
Arthropod-Plant Interactions 7 (3), 349-357
Abstract: Variation among aphid genotypes leads them to preferentially colonize different host-plant genotypes. In a natural community, different genotypes within a species are expected to coexist on a single host plant, and these aphids can interact, potentially, altering host-plant preferences. Using a model aphid (Sitobion avenae) and barley (Hordeum vulgare) system, we compared aphid preference and performance in one- or two-genotype colonies in pots with genetically diverse host plants (6 genotypes) or genetically uniform host plants (1 genotype per pot). Aphid host preference was shown to differ when a second aphid genotype was present, with one aphid genotype exhibiting a preference change due to the genotypic identity of the second aphid. The population growth rate of the aphids was not influenced by the competitor, and thus, we conclude that these effects are due to aphid distribution (preference) rather than effects through performance. Our work demonstrates that within a complex ecological community, an individual's behavior can be influenced by interactions with other genotypes within the same species, as well as interactions with genotypes of other species.
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Database assignments for author(s): Sharon E. Zytynska
Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
environment - cropping system/rotation
Pest and/or beneficial records:
|Sitobion avenae||Barley (Hordeum vulgare)|