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The importance of antennae for pea aphid wing induction in the presence of natural enemies

Published online by Cambridge University Press:  09 March 2007

G. Kunert  and
W.W. Weisser
G. Kunert*
Affiliation:
Institute of Ecology, Friedrich-Schiller University Jena, Dornburger Str. 159, 07743 Jena, Germany
W.W. Weisser
Affiliation:
Institute of Ecology, Friedrich-Schiller University Jena, Dornburger Str. 159, 07743 Jena, Germany
*
*Fax: ++49 (0) 3641 949402 E-mail: [email protected]
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Abstract

The pea aphid Acyrthosiphon pisum Harris has been shown to produce an increasing proportion of winged morphs among its offspring when exposed to natural enemies, in particular hoverfly larvae, lacewing larvae, adult and larval ladybirds and aphidiid parasitoids. While these results suggest that wing induction in the presence of predators and parasitoids is a general response of the pea aphid, the cues and mechanisms underlying this response are still unclear. Tactile stimuli and the perception of chemical signals as well as visual signals are candidates for suitable cues in the presence of natural enemies. In this paper the hypothesis that the aphids' antennae are crucial for the wing induction in the presence of natural enemies is tested. Antennae of pea aphids were ablated and morph production was scored when aphids were reared either in the presence or the absence of predatory lacewing larvae over a six-day period. Ablation of antennae resulted in a drastic drop in the proportion of winged morphs among the offspring, both in the presence and the absence of a predator whereas predator presence increased wing induction in aphids with intact antennae, as reported in previous experiments. The results show that antennae are necessary for wing induction in the presence of natural enemies. Critical re-examination of early work on the importance of aphid antennae and tactile stimuli for wing induction suggests that a combination of tactile and chemical cues is likely to be involved not only in predator-induced wing formation but also for wing induction in response to factors such as crowding in the aphid colony.

Type
Review Article
Information
Bulletin of Entomological Research , Volume 95 , Issue 2 , April 2005 , pp. 125 - 131
Copyright
Copyright © Cambridge University Press 2005

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