Host acceptance behaviour of the small ermine moth Yponomeuta cagnagellus: larvae and adults use different stimuli |
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Authors: | Peter Roessingh Katja H Hora S Ying Fung Anja Peltenburg Steph B J Menken |
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Institution: | (1) Institute for Systematics and Population Biology, University of Amsterdam, Kruislaan 320, 1098 SM Amsterdam, The Netherlands, e-mail: roessingh@bio.uva.nl, NL;(2) Institute of Evolutionary and Ecological Sciences, Leiden University, P.O. Box 9516, 2300 RA Leiden, The Netherlands, NL;(3) Division of Pharmacognosy, Leiden/Amsterdam Center for Drug Research, Gorlaeus Laboratories, Einsteinweg 55, 2300 RA Leiden, The Netherlands, NL |
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Abstract: | Summary. The sugar alcohol dulcitol is a strong feeding stimulant for larvae of the small ermine moth Yponomeuta cagnagellus. In this paper we tested the hypothesis that dulcitol also acts as an oviposition stimulant for this species. We found that
the sugar-alcohol dulcitol was present on the surface of the host Euonymus europaeus. We also showed that (as yet unidentified compounds) can be systemically transferred (i.e. by uptake and transport via the
vascular system) from E. europaeus, to the non-host Crataegus monogyna and stimulate oviposition. However, no evidence was found that this stimulatory activity was due to dulcitol. Systemic enrichment
of C. monogyna with dulcitol did not induce oviposition on this plant. Neither was the application of pure dulcitol on artificial twigs
effective. In addition it was shown that when dulcitol was removed from host plant extracts, oviposition stimulatory activity
was retained in the fraction without dulcitol. Synergism between dulcitol and other stimulants could not be demonstrated,
however, high concentrations of dulcitol in combination with the main stimulant(s) showed a trend towards enhanced oviposition.
It is concluded that the sugar alcohol dulcitol can only play a limited role in adult host acceptance behaviour. The hypothesis
that a host shift in the genus Yponomeuta from Celastraceae to Rosaceae might have been facilitated by the presence of small amounts of dulcitol in Rosaceae therefore
needs to be restricted to larval feeding behaviour.
Received 20 August 1999; accepted 6 December 1999 |
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Keywords: | ,Yponomeuta cagnagellus, host-acceptance, oviposition stimulants, behaviour, dulcitol, chemoreception, phytochemistry,,,,,,evolution, speciation, |
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