Learned magnetic compass orientation by the Siberian hamster, Phodopus sungorus
Learned magnetic compass orientation by the Siberian hamster, Phodopus sungorus
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DOI：
10.1006/anbe.2003.2111
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发表时间：
2003-04-01
期刊：
影响因子：
2.5
通讯作者：
Wilson, BW
中科院分区：
文献类型：
--
作者：
Deutschlander, ME;Freake, MJ;Wilson, BW
哺乳动物的磁性取向仅在两个属的地下鼹鼠（Spalax和Cryptomys sp.）中得到令人信服的证明。通过检查巢在径向对称的室内竞技场中的定向放置。鼹鼠表现出自发的方向偏好，把他们的巢南或东南磁北。使用类似的筑巢试验，我们表明，实验室饲养的西伯利亚仓鼠也使用磁场的方向信息来定位他们的巢。然而，与鼹鼠相反，西伯利亚仓鼠对巢穴位置的定向偏好似乎是后天习得的。试验前，将仓鼠圈养在沿沿着垂直轴对齐的矩形笼中。当随后在径向对称的竞技场中进行测试时，仓鼠将其巢定位在双峰分布中，该双峰分布与保持笼的长轴的磁性方向一致。我们还提出了从早期的一组实验中，仓鼠表现出一致的方向，只有在环境磁场，而不是在实验旋转磁场的结果。这些早期的实验进行的条件下表明，保持条件测试之前，并存在的histocues可能会影响表达的磁性方向在西伯利亚仓鼠。没有考虑这些因素和其他因素可能有助于解释为什么以前试图证明一些啮齿动物物种的磁性取向失败，或者当获得阳性结果时，很难复制。(C)2003年由Elsevier Science Ltd代表动物行为研究协会出版。
Magnetic orientation in mammals has been demonstrated convincingly in only two genera of subterranean mole-rats (Spalax and Cryptomys sp.) by examining the directional placement of nests in radially symmetrical indoor arenas. Mole-rats show a spontaneous directional preference to place their nests to the south or southeast of magnetic north. Using a similar nest-building assay, we show that laboratory-raised Siberian hamsters also use directional information from the magnetic field to position their nests. In contrast to mole-rats, however, the directional preference for nest position shown by Siberian hamsters appears to be learned. Hamsters were housed in rectangular cages aligned along perpendicular axes before testing. When subsequently tested in a radially symmetric arena, the hamsters positioned their nests in a bimodal distribution that coincided with the magnetic direction of the long axis of the holding cages. We also present results from an earlier set of experiments in which hamsters showed consistent orientation only in the ambient magnetic field, and not in experimentally rotated magnetic fields. The conditions under which these earlier experiments were carried out suggest that holding conditions prior to testing and the presence of nonmagnetic cues may influence the expression of magnetic orientation in the Siberian hamster. Failure to consider these and other factors may help to explain why previous attempts to demonstrate magnetic orientation in a number of rodent species have failed or, when positive results have been obtained, have been difficult to replicate. (C) 2003 Published by Elsevier Science Ltd on behalf of The Association for the Study of Animal Behaviour.