Sex Differences in the Telencephalic Song Control Circuitry in Bengalese Finches (Lonchura striata var. domestica)
Sex Differences in the Telencephalic Song Control Circuitry in Bengalese Finches (Lonchura striata var. domestica)
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DOI：
10.2108/zsj.22.1089
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发表时间：
2005-10
期刊：
影响因子：
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通讯作者：
Y. Tobari;Koji Z Nakamura;K. Okanoya
中科院分区：
文献类型：
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作者：
Y. Tobari;Koji Z Nakamura;K. Okanoya
摘要孟加拉雀类Lonchura striata在歌唱行为上具有极强的性别二形性；雄雀唱复杂的歌曲，而雌雀则根本不唱歌。这项研究描述了孟加拉雀脑鸣叫系统的发育分化。Nissl染色测量X区、HVC区、延髓粗壮核(RA)和黑质大细胞核(LMAN)四个端脑宋核的体积。在35日龄左右的幼虫中，雄性的X区和HVC发育良好，而雌性的X区和HVC则没有或无法辨认。男性的RA要大得多，但女性的RA几乎看不见。在男性中，X区和RA的体积在成年后进一步增加，但HVC的体积没有变化。青少年LMAN体积大于成人，且性别间无差异。总体趋势与斑马雀相似，但RA的体积不同，孟加拉雀的性二型性程度更大，分化时间更早。斑马雀对这首歌的运动学习一直持续到第90天，而孟加拉雀一直持续到第120天。与斑马雀相比，孟加拉雀的神经分化更早，学习时间更长，这可能与孟加拉雀更精细的歌声结构有关。
Abstract Bengalese finches, Lonchura striata, are extremely sexually dimorphic in their singing behavior; males sing complex songs, whereas females do not sing at all. This study describes the developmental differentiation of the brain song system in Bengalese finches. Nissl staining was used to measure the volumes of four telencephalic song nuclei: Area X, HVC, the robust nucleus of the arcopallium (RA), and the lateral portion of the magnocellular nucleus of the anterior nidopallium (LMAN). In juveniles (circa 35 days old), Area X and the HVC were well developed in males, while they were absent or not discernable in females. The RA was much larger in males but barely discernable in females. In males, the volumes of Area X and the RA increased further into adulthood, but that of the HVC remained unchanged. The LMAN volume was greater in juveniles than in adults, and there was no difference in the LMAN volume between the sexes. The overall tendency was similar to that described in zebra finches, except for the volume of the RA, where the degree of sexual dimorphism is larger and the timing of differentiation occurs earlier in Bengalese finches. Motor learning of the song continues until day 90 in zebra finches, but up to day 120 in Bengalese finches. Earlier neural differentiation and a longer learning period in Bengalese finches compared with zebra finches may be related to the more elaborate song structures of Bengalese finches.