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INTERACTIONS IN THE FLEXIBLE ORIENTATION SYSTEM OF A MIGRATORY BIRD

机译：迁徙鸟的灵活定向系统中的相互作用

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MIGRATING birds rely on interacting compass senses: magnetic, star, polarized light and perhaps Sun compasses(1,2). During the development of orientation mechanisms, celestial rotation of stars at night(3) and of polarized skylight patterns during the day time(4) provide information about true compass directions that calibrates the direction of migration selected using the magnetic compass(3-11). It might often be advantageous to adjust the magnetic preference by a geographic reference, especially at high northern latitudes where magnetic declination is large. Paradoxically, a magnetic preference so calibrated will be reliable only within a region of similar declination unless magnetic orientation remains open to calibration in older birds, something that earlier studies suggested was not the case(1,2). We report here that in the Savannah sparrow (Passerculus sandwichensis) the same sort of calibration of magnetic orientation found in very young birds also occurs in older individuals exposed during the migration period to clear day and night skies within a shifted magnetic field. [References: 28]
机译：迁徙鸟类依赖于相互作用的罗盘感官：磁性，恒星，偏振光以及也许太阳罗盘（1,2）。在定向机制的发展过程中，夜晚恒星的天体旋转（3）和白天白天偏振光模式的天体旋转（4）提供了有关真实罗盘方向的信息，这些信息可校准使用电磁罗盘选择的迁移方向（3-11） 。通过地理参考来调整磁偏性通常是有利的，特别是在磁偏角较大的北高纬度地区。矛盾的是，如此校准过的磁偏心只有在磁偏角相似的区域内才是可靠的，除非在成年鸟类中磁取向仍然可以进行校准，早期研究表明并非如此（1,2）。我们在这里报告说，在大草原麻雀（Passerculus sandwichensis）中，幼年鸟类中也发现了相同的磁取向校准，这发生在迁徙期间暴露于磁场变化的白天和黑夜的迁徙期间的年长个体中。 [参考：28]

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