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The Role of Body Size, Phylogeny, and Ambient Noise in the Evolution of Bird Song
There has been an evolutionary response to selection for low-frequency songs by birds in low-forest habitats, according to the constraints of body size and evolutionary history, and the spectral distribution of ambient noise as an additional selective factor is examined.
Seasonal plasticity in the adult brain
Seasonal Changes in Testosterone, Neural Attributes of Song Control Nuclei, and Song Structure in Wild Songbirds
The results suggest that song stereotypy, but not repertoire size, is a potential behavioral correlate of seasonal plasticity in the avian song control system.
Functional aspects of song learning in songbirds.
The active space of red-winged blackbird song
SummaryActive space, that distance from the source over which signal amplitude remains above the detection threshold of potential receivers, was determined for Red-winged Blackbird (Agelaius
Plasticity of the Adult Avian Song Control System
Seasonal plasticity of the song system may have evolved as an adaptation to reduce the energetic demands imposed by these regions of the brain outside the breeding season, when the use of song for mate attraction and territorial defense is reduced or absent.
Long-range communication of species identity by song in the Red-winged Blackbird
It is concluded that the trill portion of the redwing song encodes species identity and is adapted to communicate this information to receivers at relatively long distances.
Comparative approaches to the avian song system.
Whether the vocal control systems of parrots and songbirds were inherited from a common ancestor or independently evolved, and at what stage in the phylogeny of songbirds the hormone-sensitive forebrain circuit found in modern birds first evolved are considered.
An introduction to birdsong and the avian song system.
Song behavior and its neural control is invited as a model for identifying neural mechanisms that view progress in their area of study and, more underlie biologically relevant behavior: important, to identify critical directions for future research.
Seasonal plasticity and sexual dimorphism in the avian song control system: Stereological measurement of neuron density and number
In two song nuclei, HVc and the robust nucleus of the archistriatum (RA), the optical disector yielded intergroup differences in neuron density and number that coincided well with the three previous reports.