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Developmental stress selectively affects the song control nucleus HVC in the zebra finch brain
journal contribution
posted on 2004-11-22, 00:00 authored by Kate BuchananKate Buchanan, S Leitner, K Spencer, A Goldsmith, C CatchpoleSongbirds 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.
History
Journal
Proceedings of the royal society : B supplementVolume
271Issue
1555Pagination
2381 - 2386Publisher
The Royal Society PublishingLocation
London, EnglandISSN
0962-8452eISSN
1471-2954Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2004, The Royal SocietyUsage metrics
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No categories selectedKeywords
songneural developmentsStressTaeniopygia guttatasexual selectionsongbirdScience & TechnologyLife Sciences & BiomedicineBiologyEcologyEvolutionary BiologyLife Sciences & Biomedicine - Other TopicsEnvironmental Sciences & EcologystressRECEPTOR MESSENGER-RNAESTROGEN-RECEPTORNEURON NUMBERHONEST SIGNALGOOD GENESFOREBRAINFEMALECHOICESYSTEM
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