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First published online May 24, 2004
Journal of Experimental Biology 207, 2215-2220 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01013
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Negative effects of early developmental stress on yolk testosterone levels in a passerine bird

Diego Gil1,*, Claudia Heim2, Elena Bulmer1, Milagros Rocha3, Marisa Puerta3 and Marc Naguib2

1 Departamento de Ecología Evolutiva, Museo Nacional de Ciencias Naturales (CSIC), José Gutiérrez Abascal 2, 28006 Madrid, Spain
2 Department of Animal Behaviour, Universität Bielefeld, PO Box 100 131, 33501 Bielefeld, Germany
3 Departamento de Fisiología (Fisiología Animal II), Facultad de Biología, Universidad Complutense de Madrid, 28040 Madrid, Spain



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  		Fig. 1. Differences in yolk testosterone concentration between zebra finch females raised as nestlings in small, medium and large brood sizes. Data shown are least-square means ± 1 S.E.M. from the full model, which includes female brood size, laying order and clutch size.

 


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  		Fig. 2. Relationship between laying order and yolk testosterone concentration.

 


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  		Fig. 3. Relationship between clutch size and yolk testosterone concentration. Data shown are least-square means ± 1 S.E.M. from the full model, which includes female brood size, laying order and clutch size.

 




© The Company of Biologists Ltd 2004