Early-life social environment predicts social network position in wild zebra finches
Early-life social environment predicts social network position in wild zebra finches
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DOI：
10.1098/rspb.2018.2579
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发表时间：
2019-02-20
影响因子：
4.7
通讯作者：
Griffith, Simon C.
中科院分区：
文献类型：
--
作者：
Brandl, Hanja B.;Farine, Damien R.;Griffith, Simon C.
早期生活经验可以从根本上塑造个人的生活史轨迹。以前的研究表明，在发育过程中暴露于压力会导致以后生活中社会行为的差异。在圈养条件下，暴露于皮质酮水平升高的青少年斑胸草雀与未经治疗的兄弟姐妹相比，在社会上选择性较低，在社交网络中更为中心。这些差异延伸到社会生活的其他方面，“压力暴露”的青少年切换社会学习策略和少年男性不那么忠实地学习他们父亲的歌。然而，尽管这一系列研究表明，早期生活压力的影响可能是深远的，但这种影响是否足以在自然条件下表现出来仍然是未知的。在这里，我们收集的数据在澳大利亚沙漠斑胸草雀的社会协会后，实验操纵育雏大小。从扩大育雏的少年经历了兄弟姐妹竞争加剧，我们预测，他们会表达类似的模式的社会协会，以压力处理的鸟类在圈养研究有更多的，但分化，关系。我们对发展压力对社交网络位置的影响提出了惊人的支持，我们来自野外的数据在之前在人工饲养中测试的10个预测中有9个重复了相同的结果。在扩大的窝中长大的小鸡与更多的同类一起觅食，但它们不那么“挑剔”，在社会网络中更重要。我们的研究结果证实，早期生活经验的自然变化范围足以预测个人的社会轨迹，并支持强调发展条件对行为的潜在重要性的理论。
Early-life experience can fundamentally shape individual life-history trajectories. Previous research has suggested that exposure to stress during development causes differences in social behaviour later in life. In captivity, juvenile zebra finches exposed to elevated corticosterone levels were less socially choosy and more central in their social networks when compared to untreated siblings. These differences extended to other aspects of social life, with 'stress-exposed' juveniles switching social learning strategies and juvenile males less faithfully learning their father's song. However, while this body of research suggests that the impacts of early-life stress could be profound, it remains unknown whether such effects are strong enough to be expressed under natural conditions. Here, we collected data on social associations of zebra finches in the Australian desert after experimentally manipulating brood sizes. Juveniles from enlarged broods experienced heightened sibling competition, and we predicted that they would express similar patterns of social associations to stress-treated birds in the captive study by having more, but less differentiated, relationships. We show striking support for the suggested consequences of developmental stress on social network positions, with our data from the wild replicating the same results in 9 out of 10 predictions previously tested in captivity. Chicks raised in enlarged broods foraged with greater numbers of conspecifics butwere less 'choosy' and more central in the social network. Our results confirm that the natural range of variation in early-life experience can be sufficient to predict individuals' social trajectories and support theory highlighting the potential importance of developmental conditions on behaviour.