Migratory dark-eyed juncos, Junco hyemalis, have better spatial memory and denser hippocampal neurons than nonmigratory conspecifics
Migratory dark-eyed juncos, Junco hyemalis, have better spatial memory and denser hippocampal neurons than nonmigratory conspecifics
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DOI：
10.1006/anbe.2003.2194
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发表时间：
2003-08-01
期刊：
影响因子：
2.5
通讯作者：
Ziegenfus, CWS
中科院分区：
文献类型：
--
作者：
Cristol, DA;Reynolds, EB;Ziegenfus, CWS
动物种群的迁徙进化产生了一系列生理、行为和认知适应。特别是候鸟，它们需要在长途旅行后每年返回繁殖和越冬地点的能力，因此可以预测它们已经进化出了增强的空间记忆。在对冬季共存的两个麻雀亚种的比较中，迁徙亚种（黑眼junco，Junco hyemalis hyemalis）的表现优于非迁徙亚种（J. h. carolinensis）进行空间记忆测试。迁移的容科斯也比非迁移者有更多密集的海马神经元。在非迁徙鸟类中，我们寻找每年占据两个家域的鸟类和常年留在繁殖区的鸟类之间的海马差异，以确定迁徙本身是否与神经解剖学差异有关。然而，由于统计功效低，我们无法得出任何结论。密集的海马体可能是移民容科斯更好的空间记忆的基础。进一步测试的空间记忆景观规模需要加强这一论点，并了解移民和nonmigrants之间的认知差异。(C)2003年由Elsevier Ltd代表动物行为研究协会出版。
The evolution of migration in an animal population produces a suite of physiological, behavioural and cognitive adaptations. Migratory birds, in particular, require the ability to return annually to breeding and wintering sites after long journeys, and thus might be predicted to have evolved enhanced spatial memory. In a comparison of two sparrow subspecies that co-occur in winter, the migratory subspecies (dark-eyed junco, Junco hyemalis hyemalis) performed better than the nonmigratory subspecies (J. h. carolinensis) on a room-scale spatial memory test. The migratory juncos also had more densely packed hippocampal neurons than did nonmigrants. Among nonmigrants, we looked for hippocampal differences between birds that occupied two home ranges annually and those that remained on their breeding territory year-round, to determine whether migration, per se, is related to neuroanatomical differences. However, we were unable to reach any conclusions because of low statistical power. A denser hippocampus could be the basis for better spatial memory in migrant juncos. Further testing of spatial memory on a landscape scale is needed to strengthen this argument and to understand cognitive differences between migrants and nonmigrants. (C) 2003 Published by Elsevier Ltd on behalf of The Association for the Study of Animal Behaviour.