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First published online August 8, 2003

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Steroids for free? No metabolic costs of elevated maternal androgen levels in the black-headed gull

Corine M. Eising^1,*, G. Henk Visser^1,2, Wendt Müller¹ and Ton G. G. Groothuis¹

¹ Dept of Animal Behaviour, University of Groningen, PO Box 14, 9750 AA, Haren, The Netherlands
² Centre for Isotope Research, Nijenborgh 4, 9747 AG Groningen, The Netherlands

View larger version (17K): [in a new window]   Fig. 1. (A) Resting metabolic rates (RMR) as a function of chick age. Filled circles represent androgen-injected (T) chicks; open circles represent oil-injected (Oil) chicks. For clarification, the open circles have been plotted slightly to the right of the closed circles. (B) Mass-specific metabolic rates for T (filled circles) and Oil (open circles) chicks as a function of their age.

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