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4 resultaten
Effects of testosterone and photoperiodic condition on song production and vocal control region volumes in adult male dark-eyed juncos (Junco hyemalis).
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In seasonally breeding male oscines, song learning and expression are controlled by brain regions (vocal control regions, VCRs) that exhibit seasonal neural plasticity in adulthood. Several VCRs contain androgen receptors, and gonadal androgens play important roles in the control of seasonal
On the relation between loudness and the increased song frequency of urban birds
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Songbirds often sing at higher frequency (pitch) in urban, noise-polluted areas, which reduces acoustic masking by low-frequency anthropogenic noise. Such frequency shifts, however, are less efficient at overcoming background noise than simply singing louder. Therefore, it was suggested that
Central vasotocin-immunoreactive system in a male passerine bird (Junco hyemalis).
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Previous investigations have identified regions of the avian brain that contain immunoreactive vasotocinergic (VT-ir) cell bodies and fibers. These studies exclusively used domesticated species, and the relevance of the findings for free-living birds has not been established. The present study used
Vocal control region sizes of an adult female songbird change seasonally in the absence of detectable circulating testosterone concentrations.
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Previous research established that in several species of seasonally breeding oscine birds, brain areas [vocal control regions (VCRs)] that control vocal behavior learning and expression exhibit seasonal plasticity, being larger during than outside the reproductive period. In adult males, this
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