Steroid accumulation in song nuclei of a sexually dimorphic duetting bird, the rufous and white wren.
Steroid accumulation in song nuclei of a sexually dimorphic duetting bird, the rufous and white wren.
复制标题
雌雄二态的红鹪鹩和白鹪鹩的鸣叫核中类固醇的积累。
DOI：
10.1002/(sici)1097-4695(199610)31:2
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Loesche,P
中科院分区：
文献类型：
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作者：
Brenowitz,EA;Arnold,AP;Loesche,P
这项研究验证了一种假设，即鸟类鸣叫控制核团中对激素敏感的神经元的相对比例与基本运动唱歌能力有关，而这种神经元的绝对数量与鸣叫行为的复杂性有关。研究人员将[~3H]睾酮(T)或雌二醇(E_2)注射到雄性和雌性红褐色和白色相间的乌鸦(Thryothorus Rufabus)体内，这是一种热带物种，雌性与雄性唱二重唱，但歌唱曲目比雄性少。放射自显影分析表明，新纹状体前大细胞核(IMAN)和高发声中枢(HVC)两个宋氏核团内T和E2靶细胞的比例无性别差异。单位体积组织的标记细胞密度在两个宋氏核中均无性别差异。然而，男性的歌声核团更大，这与他们更复杂的歌唱行为相一致，因此这些区域对激素敏感的神经元总数比女性更多。将这些结果与斑马雀、金丝雀和白鹭体内激素积累的测量结果进行比较，支持了提出的假设。©1996 John Wiley父子公司
This study tested the hypothesis that the relative proportion of neurons that are hormone sensitive in avian song control nuclei is related to the basic motor ability to sing, whereas the absolute number of such neurons is related to the complexity of song behavior. Either [3H]testosterone (T) or estradiol (E2) was injected into male and female rufous and white wrens (Thryothorus rufalbus), a tropical species in which females sing duets with males but have smaller song repertoires than males. Autoradiographic analysis indicated that there were no sex differences in the proportions of T or E2target cells in two song nuclei: the high vocal center (HVC) and the lateral portion of the magnocellular nucleus of the anterior neostriatum (IMAN). The density of labeled cells per unit volume of tissue did not differ between the sexes in either song nucleus. Males have larger song nuclei, however, which is consistent with their more complex song behavior, and therefore have a greater total number of hormone‐sensitive neurons in these regions than do females. Comparison of these results with measures of hormone accumulation in zebra finches, canaries, and bay wrens supports the hypothesis presented. © 1996 John Wiley & Sons, Inc.