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Spectral sensitivity and visual conditioning in the parasitoid wasp Trybliographa rapae (Hymenoptera: Cynipidae)

Published online by Cambridge University Press:  10 July 2009

P.E. Brown*
Affiliation:
School of Biological Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
C.P. Frank
Affiliation:
School of Biological Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
H.L. Groves
Affiliation:
School of Biological Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
M. Anderson
Affiliation:
School of Biological Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
*
* present address: School of Biomedical Sciences, Bute Building, University of St Andrews, Fife, KY16 9TS, UK. E-mail: [email protected]

Abstract

Spectral sensitivity of the wasp Trybliographa rapae (Westwood), a parasitoid of cabbage root fly larvae, was measured by the electroretinogram (ERG) technique and by a complimentary behavioural technique, to 15 selected wavelength bands from 340 to 670 nm. Peaks of electroretinogram sensitivity were found in the ultraviolet, blue and green-yellow regions of the spectrum. This corresponds to known classes of photoreceptor present in the Hymenoptera. Behavioural peaks of phototactic attraction were found in the ultraviolet and green-yellow regions, but not in the blue. No differences were observed between the sexes. We suggest that ultraviolet and green-yellow wavelengths initiated ‘escape’ and ‘foliage’ orientated behaviour respectively. Blue wavelengths appear to have a less specific function but may be important for colour discrimination. Blue wavelengths did, however, become significantly more attractive to female wasps after a pre-experimental conditioning period involving exposure to blue wavelengths in combination with swede infested with cabbage root fly larvae. Thus T. rapae has been demonstrated to show plasticity in its visually motivated behaviour. This may prove advantageous in the development of an artificial egg collecting technique for this species.

Type
Review Article
Copyright
Copyright © Cambridge University Press 1998

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