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First published online December 2, 2005
Journal of Experimental Biology 208, 4593-4598 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01949
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Male song quality affects circulating but not yolk steroid concentrations in female canaries (Serinus canaria)

Rupert C. Marshall1,*, Bernd Leisler2, Clive K. Catchpole1 and Hubert Schwabl3

1 School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey, TW20 OEX, UK
2 Max Planck Research Centre for Ornithology, Vogelwarte Radolfzell, 78315 Radolfzell, Germany
3 Center for Reproductive Biology, School of Biological Sciences, Washington State University, Pullman, WA 99164-4236, USA



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  		Fig. 1. Effect of song quality on female hormone levels: mean concentrations for androgen (testosterone) and oestrogen (oestradiol; pg mg–1 faeces) showing effect of song treatment and treatment order. See text for explanation of statistical significance.

 


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  		Fig. 2. Effect of song quality on yolk steroid levels across the lay order. Females varied by orders of magnitude in their means, thus the figure shows mean ranked concentrations of androstenedione (A4), 5{alpha}-dihydrotestosterone (5{alpha}-DHT), testosterone (T) and 17ß-oestradiol (E2) for ease of interpretation (pg steroid mg–1 yolk): all analysis was conducted upon calculated levels.

 




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