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arXiv 1702.03388physics.bio-ph
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论鸟罗盘的功能窗

On the functional window of the avian compass

Vishvendra Singh Poonia, Kiran Kondabagil, Dipankar Saha, Swaroop Ganguly

备注：
7 pages, 4 figures
发表信息：
Phys. Rev. E 95, 052417 (2017)
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摘要：

功能窗是鸟类罗盘的一个实验观察到的特性，指的是它对地磁场强度的选择性。我们表明，自由基对模型，使用生物学上可行的超精细参数，可以定性地解释从行为实验观察到的鸟类罗盘的显着特点：其功能窗口，以及特定频率的RF场的罗盘行动的中断。此外，我们表明，超精细参数的调整可以调整功能窗口，这表明了一个可能的机制，其所观察到的适应性字段的变化。虽然这些提供了强有力的支持，以自由基对模型，我们发现它不可能定量地解释观察到的宽度的功能窗口在这个模型中，甚至与简单的扩增。这表明，这个模型可能需要更深层次的推广;我们推测，环境耦合可能在这里发挥了微妙的作用，还没有被准确地捕捉。最后，我们研究了一个可能的生物学目的的功能窗口，假设进化的好处，从自由基对磁感受，我们推测，功能窗口仅仅是一个推论，并没有带来额外的优势。

英文摘要：

The functional window is an experimentally observed property of the avian compass that refers to its selectivity around the geomagnetic field strength. We show that the radical-pair model, using biologically feasible hyperfine parameters, can qualitatively explain the salient features of the avian compass as observed from behavioral experiments: its functional window, as well as disruption of the compass action by an RF field of specific frequencies. Further, we show that adjustment of the hyperfine parameters can tune the functional window, suggesting a possible mechanism for its observed adaptability to field variation. While these lend strong support to the radical-pair model, we find it impossible to explain quantitatively the observed width of the functional window within this model, or even with simple augmentations thereto. This suggests that a deeper generalization of this model may be called for; we conjecture that environmental coupling may be playing a subtle role here that has not been captured accurately. Lastly, we examine a possible biological purpose to the functional window; assuming evolutionary benefit from radical-pair magnetoreception, we conjecture that the functional window is simply a corollary thereof and brings no additional advantage.

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