Avian magnetoreception: elaborate iron mineral containing dendrites in the upper beak seem to be a common feature of birds.
Avian magnetoreception: elaborate iron mineral containing dendrites in the upper beak seem to be a common feature of birds.
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DOI：
10.1371/journal.pone.0009231
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发表时间：
2010-02-16
期刊：
影响因子：
3.7
通讯作者：
Fleissner G
中科院分区：
文献类型：
--
作者：
Falkenberg G;Fleissner G;Schuchardt K;Kuehbacher M;Thalau P;Mouritsen H;Heyers D;Wellenreuther G;Fleissner G
使鸟类能够从地球磁场中提取方位信息的磁场传感器仍然是个谜。我们以前发表的结果，从信鸽，使我们建议，含铁的感觉树突在真皮内层的上喙是一个候选结构，这样一个鸟类磁强计系统。在这里，我们发现，类似的结构发生在两种候鸟（花园莺，西尔维娅borin和欧洲知更鸟，Erithacus rubecula）和非候鸟，家鸡（原鸡）。在所有这些鸟类中，组织学数据显示树突的形状和大小相似，所有含铁矿物的不同亚细胞隔室的神经末梢的正中分支的眼神经。我们还使用显微X射线吸收光谱分析，以确定所涉及的铁矿物几乎完全是三价铁氧化物。磁铁矿（Fe II/III）也可能出现在这些结构中，但不是主要的Fe成分。我们的数据表明，这种复杂的树突状系统在喙是鸟类的一个共同特征，它可能形成一个基本的感官基础，至少某些类型的磁场引导行为的进化。
The magnetic field sensors enabling birds to extract orientational information from the Earth's magnetic field have remained enigmatic. Our previously published results from homing pigeons have made us suggest that the iron containing sensory dendrites in the inner dermal lining of the upper beak are a candidate structure for such an avian magnetometer system. Here we show that similar structures occur in two species of migratory birds (garden warbler, Sylvia borin and European robin, Erithacus rubecula) and a non-migratory bird, the domestic chicken (Gallus gallus). In all these bird species, histological data have revealed dendrites of similar shape and size, all containing iron minerals within distinct subcellular compartments of nervous terminals of the median branch of the Nervus ophthalmicus. We also used microscopic X-ray absorption spectroscopy analyses to identify the involved iron minerals to be almost completely Fe III-oxides. Magnetite (Fe II/III) may also occur in these structures, but not as a major Fe constituent. Our data suggest that this complex dendritic system in the beak is a common feature of birds, and that it may form an essential sensory basis for the evolution of at least certain types of magnetic field guided behavior.
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影响因子：
3
作者：
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通讯作者：
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影响因子：
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