DeVoogd T J, Houtman A M, Falls J B
Department of Psychology, Cornell University, Ithaca, New York 14853, USA.
J Neurobiol. 1995 Oct;28(2):202-13. doi: 10.1002/neu.480280207.
White-throated sparrows are unusual among songbirds in that they occur in two color morphs, white-striped and tan-striped, determined by a chromosomal inversion and maintained by negative assortative mating. These differ in several reproductive behaviors, including amount of singing: white-striped males sing frequently, tan-striped females never sing, and tan-striped males and white-striped females sing an intermediate amount. The present study measures the volumes of several nuclei in the avian song system and relates these to color morph and to sex. We find that robustus archistristalis and the tracheosyringeal part of the hypoglossal nucleus, nuclei closely involved in song production, are larger in white-striped than in tan-striped birds. We also find morph differences for nuclei in the rostral division of the song system, nuclei believed to be less directly involved in song production. We find sex differences throughout the song system as has been reported in other songbirds. Relationships between structure and function in the song system are discussed.
白喉带鹀在鸣禽中很不寻常，因为它们有两种颜色形态，即白条纹和棕条纹，这是由染色体倒位决定的，并通过负选型交配得以维持。它们在几种繁殖行为上存在差异，包括鸣叫的频率：白条纹雄性频繁鸣叫，棕条纹雌性从不鸣叫，棕条纹雄性和白条纹雌性鸣叫频率介于两者之间。本研究测量了鸟类鸣唱系统中几个核团的体积，并将这些与颜色形态和性别联系起来。我们发现，与鸣唱产生密切相关的弓状古纹状体粗核和舌下神经核的气管鸣管部，白条纹鸟类比棕条纹鸟类更大。我们还发现鸣唱系统嘴侧部核团存在形态差异，这些核团被认为与鸣唱产生的直接关系较小。正如在其他鸣禽中所报道的那样，我们在整个鸣唱系统中都发现了性别差异。本文讨论了鸣唱系统中结构与功能之间的关系。
