Vernal growth of vocal control nucleus Area X, but not HVC, precedes gonadal recrudescence in wild black-capped chickadees (Poecile atricapillus).

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Broderick M B Parks, Kyle McVea, Leslie S Phillmore
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Abstract

In temperate-zone songbirds, the neuroanatomical changes which occur in advance of breeding, including the growth of nuclei of the vocal control system, are believed to occur downstream of gonadal recrudescence. However, evidence from wild birds is mixed. Here, we captured black-capped chickadees from the wild in early spring (March-April), summer (August-September), and winter (December-January); in addition to measuring the volumes of two vocal control nuclei (Area X and HVC), we also quantified two indicators of reproductive state (gonads and circulating gonadal steroids). Most birds captured in early spring had regressed gonads and low levels of circulating gonadal steroids, indicating these birds were not yet in full breeding condition. However, these early spring birds still had a significantly larger Area X than winter birds, while HVC did not differ in size across groups. Using data from a previously published seasonal study of black-capped chickadees (Phillmore et al., Developmental Neurobiology, 2015;75:203-216), we then compared Area X and HVC volumes from our early spring group to a breeding group of chickadees captured 3-4 weeks later in the spring. While Area X volume did not differ between the studies, breeding males in Phillmore et al. (2015) had a significantly larger HVC. Taken together, this suggests that the vernal growth of Area X occurs ahead of HVC in black-capped chickadees, and that the overall vernal changes in the vocal control system occur at least partially in advance of the breeding-associated upregulation of the hypothalamic-pituitary-gonadal axis.

Abstract Image

野生黑帽秧鸡(Poecile atricapillus)发声控制核X区(而非HVC)的春季生长先于性腺再发育。
在温带鸣禽中,繁殖前发生的神经解剖学变化,包括发声控制系统核团的生长,被认为发生在性腺再发育的下游。然而,来自野生鸟类的证据却不尽相同。在这里,我们分别在早春(3-4月)、夏季(8-9月)和冬季(12-1月)从野外捕获了黑帽秧鸡;除了测量两个发声控制核(X区和HVC)的体积外,我们还量化了生殖状态的两个指标(性腺和循环性腺类固醇)。早春捕获的大多数鸟类性腺退化,循环性腺类固醇水平较低,表明这些鸟类尚未完全进入繁殖状态。然而,这些早春鸟类的 X 区仍然明显大于冬季鸟类,而 HVC 的大小在不同组别之间没有差异。利用之前发表的黑帽秧鸡季节性研究数据(Phillmore 等,《发育神经生物学》,2015;75:203-216),我们将早春组的 X 区和 HVC 容量与春季 3-4 周后捕获的繁殖组秧鸡进行了比较。虽然 X 区体积在不同研究中并无差异,但 Phillmore 等人(2015 年)研究中的繁殖雄鸟的 HVC 明显更大。综上所述,这表明在黑帽秧鸡体内,X区的春季生长先于HVC,发声控制系统的整体春季变化至少部分先于与繁殖相关的下丘脑-垂体-性腺轴的上调。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.20
自引率
4.30%
发文量
567
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