Iron-mineral-based magnetoreception in birds: the stimulus conducting system
Iron-mineral-based magnetoreception in birds: the stimulus conducting system
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DOI：
10.1007/s10336-007-0229-y
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发表时间：
2007-12-01
影响因子：
1.3
通讯作者：
Falkenberg, Gerald
中科院分区：
文献类型：
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作者：
Fleissner, Gerta;Fleissner, Guenther;Falkenberg, Gerald
鸟类是分析磁场对行为和生理影响的最彻底研究的模型系统之一。众所周知，它们能够利用位置之间场强、方向和倾角的微小变化作为磁力图和指南针。然而，导致这种能力的潜在感觉过程的神经生物学机制和磁物理原理在很大程度上是未知的。多年来，这些生物体一直被视为黑匣子系统，以磁场分量作为输入，以各种行为现象作为输出。许多不包含神经生物学原理或磁物理学背景知识的假设是根据此类研究的结果得出的。在这项研究中，我们首次利用生理受体范例来获得鸟类基于铁矿物质的磁感受的合理模型。基于鸟类喙中树突系统的组织学和物理化学数据，我们提出了一个识别适当刺激的刺激传导系统模型。特殊的受体特征将这种刺激转化为周围神经系统的兴奋，然后通过中枢神经系统执行的信息处理来感知局部磁场矢量。基于这种方法，可以开发进一步的神经生物学和行为实验，批判性地测试所提出的磁感受模型，特别是更深入地研究磁场定向期间发生的感知和运动控制的复杂过程。
Birds are among the most throughly investigated model systems for the analysis of the impact of magnetic fields on behavior and physiology. They are known to be able to use astonishingly small changes in field intensity, direction and inclination between locations as a magnetic map and compass. However, the neurobiological mechanisms and the magnetophysical principles of the underlying sensory processes that lead to this ability are largely unknown. For many years these organisms have been treated as black box systems with magnetic field components as input and various behavioral phenomena as output. Many hypotheses that do not incorporate neurobiological principles or magnetophysical background knowledge have been derived based on the results of such studies. In this study, for the first time, we make use of physiological receptor paradigms in order to obtain a sound model for iron-mineral-based magnetoreception in birds. Based on histological and physicochemical data from a dendritic system in the avian beak, we present a model of the stimulus conducting system that recognizes the adequate stimulus. Special receptor features transform this stimulus into peripheral nervous system excitation, and the local magnetic field vector is then perceived via information processing performed by the central nervous system. Based on this approach, further neurobiological and behavioral experiments can be developed that critically test the proposed model of magnetoreception and, in particular, study the complex processes of perception and motor control that occur during magnetic field orientation in more depth.