Dissociable effects of social context on song and doublecortin immunoreactivity in male canaries.
Dissociable effects of social context on song and doublecortin immunoreactivity in male canaries.
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DOI：
10.1111/ejn.12658
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发表时间：
2014-09
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影响因子：
--
通讯作者：
Ball GF
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文献类型：
--
作者：
Alward BA;Mayes WD;Peng K;Stevenson TJ;Balthazart J;Ball GF
环境因素的变化，如白天的长度和社会背景，极大地影响了生殖行为和调节这些行为的大脑区域。其中一种行为是鸣禽的歌声，雄性在繁殖季节用歌声来吸引配偶。在这些物种中，没有潜在的配偶会导致歌曲数量的增加，而配偶的存在会大大减少唱歌。有趣的是，虽然长时间的白天会促进歌曲行为，但产生歌曲本身可以促进控制歌曲输出的大脑区域中新神经元的整合。社会环境也可以影响这些歌曲控制核团的神经可塑性。本研究的目的是调查金丝雀（Serinus canaria），鸣禽物种，光周期和社会环境如何影响歌曲和新的神经元的纳入，如微管相关蛋白，doublecortin（DCX），在HVC，一个关键的发声大脑区域的歌曲控制系统。我们发现，长时间的白天增加了HVC的大小和歌唱活动。此外，雄性金丝雀配对的女性两个星期表现出增强的DCX免疫反应性HVC相对于鸟类单独居住。然而，引人注目的是，配对的雄性唱的歌较少，表现出减少的声学特征，如歌曲的复杂性和能量，相比之下，鸟类单独居住，唱多产。这些结果表明，社会存在起着重要的作用，在鸣禽的神经和行为可塑性的调节，并可以发挥这些影响，在反对可能是基于活动诱导的神经发生的预期。
Variation in environmental factors such as day length and social context greatly affects reproductive behavior and the brain areas that regulate these behaviors. One such behavior is song in songbirds, which males use to attract a mate during the breeding season. In these species the absence of a potential mate leads to an increase in the number of songs produced, while the presence of a mate greatly diminishes singing. Interestingly, although long days promote song behavior, producing song itself can promote the incorporation of new neurons in brain regions controlling song output. Social context can also affect such neuroplasticity in these song control nuclei. The goal of the present study was to investigate in canaries (Serinus canaria), a songbird species, how photoperiod and social context affect song and the incorporation of new neurons, as measured by the microtubule-associated protein, doublecortin (DCX), in HVC, a key vocal production brain region of the song control system. We show that long days increased HVC size and singing activity. In addition, male canaries paired with a female for two weeks showed enhanced DCX-immunoreactivity in HVC relative to birds housed alone. Strikingly, however, paired males sang fewer songs that exhibited a reduction in acoustic features such as song complexity and energy, compared to birds housed alone, which sang prolifically. These results show that social presence plays a significant role in the regulation of neural and behavioral plasticity in songbirds and can exert these effects in opposition to what might be expected based on activity-induced neurogenesis.