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Avian ultraviolet vision and frequency-dependent seed preferences

Stuart C. Church*, Annabel S. L. Merrison and Toby M. M. Chamberlain

Ecology of Vision Research Group, School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK



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  		Fig. 1. (A) Mean transmission spectra of ultraviolet-transmitting (UV+) and ultraviolet-blocking (UV-) filters used in experiment 1. (B) Mean transmission spectra of ultraviolet-blocking (UV-), short-wavelength blocking (SW-), medium-wavelength blocking (MW-) and long-wavelength blocking (LW-) filters used in experiment 2. (C) Reflectance spectra of red millet seeds, white millet seeds and their sand background used in experiments 1 and 2. Values are means ± S.E.M. (N=8 for all three means).

 


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  		Fig. 2. Experiment 1: the effect of frequency and filter type (UV+ or UV-; see Fig.1) on seed selectivity (ßred) by zebra finches. Open columns represent a 1:9 ratio (20:180) and filled columns a 9:1 ratio (180:20) of red:white millet seeds. Values are means + S.E.M. (N=8).

 


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  		Fig. 3. Experiment 2: the effect of seed frequency and filter type (ultraviolet-blocking (UV-), short-wavelength blocking (SW-), medium-wavelength blocking (MW-) or long-wavelength blocking (LW-) on selectivity (ßred) by zebra finches. As in Fig.2, open columns represent a 1:9 ratio (20:180) and filled columns a 9:1 ratio (180:20) of red:white millet seeds. Values are means + S.E.M. (N=8).

 




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