Rapid response to intraclonal selection in the pea aphid (Acyrthosiphon pisum) |
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Authors: | Maydianne C B Andrade Bernard D Roitberg |
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Institution: | (1) Department of Biological Sciences, Simon Fraser University, V5A 1S6 Burnaby, British Columbia, Canada;(2) Department of Zoology, Erindale College, University of Toronto, L5L 1C6 Mississauga, Ontario, Canada |
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Abstract: | Summary Pea aphids show intraclonal variability in antipredator behaviour. Among the offspring of a single parthenogenetically reproducing female, some individuals drop from the plant in response to alarm pheromone while others remain on the plant. We demonstrate that this intraclonal behavioural variability can be altered by selection. The proportion of aphids dropping in response to alarm pheromone was significantly greater in lines in which this behaviour was selected than in clonally identical lines in which the opposite phenotype was favoured. This change occurred within one generation and could not be attributed to grand-maternal effects, nor to environmental effects. These results demonstrate the ability of clonal aphids to adapt to changes in the environment within a single generation. |
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Keywords: | artificial selection Homoptera Aphididae intraclonal variability predator escape behaviour maternal effects |
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