Abstract:
:The androgen concentration in birds' eggs varies with laying order, breeding conditions, and mate attractiveness. In passerine birds, mate attractiveness depends upon song quality. The aim of our study was to evaluate the effect of one criterion used by females to assess male song quality that is to say the presence of sexually attractive phrases on yolk androgen deposition. Twenty-five female Canaries were assigned to three experimental groups; in the first group, the females were allowed to hear songs made up with attractive phrases; in the second group, they were allowed to hear songs made up with non-attractive phrases; and in the control group, the females could not hear any song. Our results show that females allowed to hear songs with attractive phrases deposit significantly higher amounts of androgens (mostly testosterone) in their eggs than females without acoustical stimulation. The females exposed to songs with non-attractive phrases had androgen amounts halfway between the two other groups. This suggests that when females are paired with mates able to sing attractive phrases they can allocate more androgens in their eggs during the pre-laying period.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
Tanvez A,Béguin N,Chastel O,Lacroix A,Leboucher Gdoi
10.1016/j.ygcen.2004.05.010keywords:
subject
Has Abstractpub_date
2004-09-01 00:00:00pages
113-20issue
2eissn
0016-6480issn
1095-6840pii
S001664800400156Xjournal_volume
138pub_type
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