Developmental stress selectively affects the song control nucleus HVC in the zebra finch

Songbirds sing complex songs as a result of evolution through sexual selection. The evolution of such sexually selected traits requires genetic control, as well as selection on their expression. Song is controlled by a discrete neural pathway in the brain, and song complexity has been shown to corre...

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Bibliographic Details
Published in:Proceedings of the Royal Society. B, Biological sciences Biological sciences, 2004-11, Vol.271 (1555), p.2381-2386
Main Authors: Buchanan, K. L., Leitner, S., Spencer, K. A., Goldsmith, A. R., Catchpole, C. K.
Format: Article
Language:English
Subjects:
Analysis of Variance
Androgen receptors
Animals
Bird songs
Brain - anatomy & histology
Brain - growth & development
Breeding
Corticosterone
Evolutionary genetics
Finches
Finches - physiology
Histological Techniques
Male animals
Neural Development
Oxidative stress
Receptors, Androgen - metabolism
Sexual Selection
Song
Songbird
Songbirds
Sstress
Stress, Physiological - physiopathology
Taeniopygia guttata
Vocalization, Animal - physiology
Zebras
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Summary:Songbirds sing complex songs as a result of evolution through sexual selection. The evolution of such sexually selected traits requires genetic control, as well as selection on their expression. Song is controlled by a discrete neural pathway in the brain, and song complexity has been shown to correlate with the volume of specific song control nuclei. As such, the development of these nuclei, in particular the high vocal centre (HVC), is thought to be the mechanism controlling signal expression indicating male quality. We tested the hypothesis that early developmental stress selectively affects adult HVC size, compared with other brain nuclei. We did this by raising cross-fostered zebra finches (Taeniopygia guttata) under stressed and controlled conditions and determining the effect on adult HVC size. Our results confirm the strong influence of environmental conditions, particularly on HVC development, and therefore on the expression of complex songs. The results also show that both environmental and genetic factors affect the development of several brain nuclei, highlighting the developmental plasticity of the songbird brain. In all, these results explain how the complex song repertoires of songbirds can evolve as honest indicators of male quality.
ISSN:0962-8452
1471-2954
DOI:10.1098/rspb.2004.2874