Where on earth can animals use a geomagnetic bi-coordinate map for navigation?
Where on earth can animals use a geomagnetic bi-coordinate map for navigation?
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DOI：
10.1111/j.1600-0587.2012.07507.x
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发表时间：
2012-11-01
期刊：
影响因子：
5.9
通讯作者：
Alerstam, Thomas
中科院分区：
文献类型：
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作者：
Bostrom, Jannika E.;Akesson, Susanne;Alerstam, Thomas
许多动物类群已被证明具有真正的导航能力。在这项研究中，我们通过分析地磁总强度和倾角等值线之间的角度差异，研究了地球不同区域地磁双坐标地图导航的可能性。在等值线几乎平行的无网格区域，有效的地磁双坐标导航可能不可行。这些区域在北半球形成了南北延伸的四个不同区域，而南半球的格局则更为分散。这些区域的每一侧通常会出现镜像效应，出现相同的地磁参数组合。这可能会给跨越经度东西向长距离迁徙的物种带来问题，因为它们可能会经过具有相同地磁坐标的区域。为四个候鸟雀形目鸟类种群假设的迁徙路线用于说明沿不同路线进行地磁双坐标地图导航的可能性。我们的结论是，动物导航不太可能普遍仅基于地磁双坐标地图机制，并且我们预测地磁坐标信息的相对重要性在动物、区域和路线之间存在差异，具体取决于地球不同区域双坐标地磁导航的不同条件。
Many animal taxa have been shown to possess the ability of true navigation. In this study we investigated the possibilities for geomagnetic bi-coordinate map navigation in different regions of the earth by analysing angular differences between isolines of geomagnetic total intensity and inclination. In no-grid zones where isolines were running almost parallel, efficient geomagnetic bi-coordinate navigation would probably not be feasible. These zones formed four distinct areas with a north-south extension in the northern hemisphere, whereas the pattern in the southern hemisphere was more diffuse. On each side of these zones there was often a mirror effect where identical combinations of the geomagnetic parameters appeared. This may potentially cause problems for species migrating long distances east-west across longitudes, since they may pass areas with identical geomagnetic coordinates. Migration routes assumed for four populations of migratory passerine birds were used to illustrate the possibilities of geomagnetic bi-coordinate map navigation along different routes. We conclude that it is unlikely that animal navigation is universally based on a geomagnetic bi-coordinate map mechanism only, and we predict that the relative importance of geomagnetic coordinate information differs between animals, areas and routes, depending on the different conditions for bi-coordinate geomagnetic navigation in different regions of the earth.