Vocal control region sizes of an adult female songbird change seasonally in the absence of detectable circulating testosterone concentrations.
Vocal control region sizes of an adult female songbird change seasonally in the absence of detectable circulating testosterone concentrations.
复制标题
在没有可检测到的循环睾酮浓度的情况下，成年雌性鸣禽的声音控制区域大小会季节性变化。
DOI：
10.1002/(sici)1097-4695(20000205)42:2
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Gulledge,CC
中科院分区：
文献类型：
--
作者：
Deviche,P;Gulledge,CC
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 seasonal decrease correlates with circulating testosterone (T) concentrations. VCRs contain androgen receptors and T plays an important role in neural plasticity and in the control of singing behavior. In behaviorally dimorphic species, VCRs are larger in males than females and change seasonally also in females, but the dependency of these changes on circulating T levels in females has not been established. In free‐living adult dark‐eyed juncos (Junco hyemalis), a species in which females do not normally sing, the sizes of three VCRs (high vocal center, robust nucleus of the archistriatum, and Area X) were larger in males than females and decreased between summer and fall in both sexes. In males, this decrease was associated with changes in circulating T concentrations. Females, however, had on average undetectable T levels throughout the breeding season. Seasonal changes in VCR volumes in adult females may depend on very low (below detection limit) circulating T concentrations, on nonandrogenic plasma steroids, on androgen (or androgen metabolites) produced in brain tissues, and/or on nonsteroidal factors such as photoperiod or social interactions with conspecific birds. © 2000 John Wiley & Sons, Inc. J Neurobiol 42: 202–211, 2000
