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First published online August 8, 2003

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The effect of colour vision status on the detection and selection of fruits by tamarins (Saguinus spp.)

Andrew C. Smith^1,*, Hannah M. Buchanan-Smith¹, Alison K. Surridge², Daniel Osorio³ and Nicholas I. Mundy⁴

¹ Scottish Primate Research Group, Department of Psychology, University of Stirling, Stirling FK9 4LA, UK
² School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, UK
³ Biological Sciences, University of Sussex, Brighton BN1 9QG, UK
⁴ Department of Zoology, Downing St, University of Cambridge, Cambridge CB2 3EJ, UK

View larger version (13K): [in a new window]   Fig. 1. Chromaticities of natural Abuta fluminum leaves and fruit and of the model colours used in this experiment, plotted in a standard chromaticity diagram modified for the common marmoset eye (see text; Macleod and Boynton, 1979; Regan et al., 1998). Colour differences on the horizontal axis are visible only to trichromats. Note that distance in this diagram does not directly predict colour discriminability. For example, in general, a given colour distance on the vertical axis will be less discriminable than on the horizontal. L, leaf; U, unripe; M, mid-ripe; R, ripe.

View larger version (15K): [in a new window]   Fig. 2. Reflectance spectra of ripe and unripe A. fluminum fruit and leaves (upper surface).

View larger version (11K): [in a new window]   Fig. 3. Diagram of artificial fruit and its coloured lid, and the pattern of the 21 test fruits.

View larger version (126K): [in a new window]   Fig. 4. A saddleback tamarin foraging for the artificial fruits when presented on a leaf background.