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Out of the blue: the spectral sensitivity of hummingbird hawkmoths.

På svenska

Author

  • Francismeire Jane Telles
  • Olle Lind
  • Miriam Henze
  • Miguel Angel Rodríguez-Gironés
  • Joaquin Goyret
  • Almut Kelber

Summary, in English

The European hummingbird hawkmoth Macroglossum stellatarum is a diurnal nectar forager like the honeybee, and we expect similarities in their sensory ecology. Using behavioural tests and electroretinograms (ERGs), we studied the spectral sensitivity of M. stellatarum. By measuring ERGs in the dark-adapted eye and after adaptation to green light, we determined that M. stellatarum has ultraviolet (UV), blue and green receptors maximally sensitive at 349, 440 and 521 nm, and confirmed that green receptors are most frequent in the retina. To determine the behavioural spectral sensitivity (action spectrum) of foraging moths, we trained animals to associate a disk illuminated with spectral light, with a food reward, and a dark disk with no reward. While the spectral positions of sensitivity maxima found in behavioural tests agree with model predictions based on the ERG data, the sensitivity to blue light was 30 times higher than expected. This is different from the honeybee but similar to earlier findings in the crepuscular hawkmoth Manduca sexta. It may indicate that the action spectrum of foraging hawkmoths does not represent their general sensory capacity. We suggest that the elevated sensitivity to blue light is related to the innate preference of hawkmoths for blue flowers.

Publishing year

2014

Language

English

Pages

537-546

Publication/Series

Journal of Comparative Physiology A

Volume

200

Issue

6

Document type

Journal article

Publisher

Springer

Topic

  • Zoology
  • Philosophy

Keywords

  • Macroglossum stellatarum
  • Spectral sensitivity
  • Sphingidae
  • Insect colour vision
  • Action spectrum

Status

Published

Research group

  • Lund Vision Group

ISBN/ISSN/Other

  • ISSN: 1432-1351