Smith G T, Brenowitz E A, Wingfield J C, Baptista L F
Department of Zoology (NJ-15), University of Washington, Seattle 98195, USA.
J Neurobiol. 1995 Sep;28(1):114-25. doi: 10.1002/neu.480280110.
In males of several songbird species, the morphology of forebrain nuclei that control song changes seasonally. The only seasonally breeding songbird in which seasonal changes in the structure of song control nuclei have been reported not to occur is the nonmigratory Nuttall's subspecies of white-crowned sparrow. In the present study, we manipulated photoperiod and plasma testosterone concentrations in captive male white-crowned sparrows of the migratory Gambel's subspecies. Males exposed to photoperiods and plasma testosterone concentrations typical of those experienced by wild breeding males had larger song control nuclei than males held on a winter photoperiod. We also found seasonal changes in stereotype of spectral and temporal parameters of song in wild Gambel's white-crowned sparrows. We hypothesize that seasonal changes in the song control nuclei may correlate with seasonal changes in song stereotypy.
在几种鸣禽物种的雄性个体中，控制鸣叫的前脑核的形态会随季节变化。唯一一种据报道其鸣叫控制核结构不会发生季节性变化的季节性繁殖鸣禽是不迁徙的白冠雀纳塔尔亚种。在本研究中，我们对圈养的迁徙性甘贝尔亚种雄性白冠雀的光照周期和血浆睾酮浓度进行了调控。与处于冬季光照周期的雄性相比，暴露于野生繁殖雄性所经历的典型光照周期和血浆睾酮浓度下的雄性，其鸣叫控制核更大。我们还发现野生甘贝尔白冠雀鸣叫的频谱和时间参数的刻板模式存在季节性变化。我们推测，鸣叫控制核的季节性变化可能与鸣叫刻板模式的季节性变化相关。
