Flower colour variation across a hybrid zone in Antirrhinum as perceived by bumblebee pollinators

  • Emmanuelle Tastard
  • Christophe Andalo
  • Martin Giurfa
  • Monique Burrus
  • Christophe Thébaud
Original Paper

Abstract

To assess if pollinators’ behaviour could explain the maintenance of hybrid zones between different flower colour morphs, we analyzed flower colour variation in an Antirrhinum hybrid zone using spectrometry and a model of bee perception. Some colours generated by hybridization were not observed in any Antirrhinum species and even appeared to be rare among angiosperms. Variation in flower colours within the hybrid zone was continuous; the most similar colours were predicted not to be discriminated from one another in natural foraging situations. However, when compared at a scale corresponding to bees’ foraging range, some flower colours could be discriminated from all colours displayed by neighbouring plants. This could affect pollinator behaviour and explain lower visitation rates within the centre of the hybrid zone. Behavioural studies involving bumblebees and plant mixtures of parental and hybrid flower colours carefully characterized with appropriate visual models will be necessary to test this hypothesis.

Keywords

Hybrid zone Flower colour Bee visual model Pollination ecology 

Notes

Acknowledgements

We thank M. Bernardet, F. Bourgeot, E. Coen, M. Cruzan, J. Leneveu, and A. Whibley for field assistance, and J. Benard for help with reflectance measurements. We also thank J. Chave, P. Heeb, and S. Ponsard for valuable comments on the manuscript. Financial support for this study was provided by CNRS and French Ministry of Research core funding to UMR 5174 CNRS-Université Paul Sabatier.

Supplementary material

11829_2008_9046_MOESM1_ESM.pdf (14 kb)
(PDF 14 kb)

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Emmanuelle Tastard
    • 1
  • Christophe Andalo
    • 1
  • Martin Giurfa
    • 2
  • Monique Burrus
    • 1
  • Christophe Thébaud
    • 1
  1. 1.Laboratoire Evolution et Diversité BiologiqueUMR 5174, CNRS-Université Paul SabatierToulouse cedex 9France
  2. 2.Centre de Recherches sur la Cognition AnimaleUMR 5169, CNRS-Université Paul SabatierToulouse cedex 9France

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