LGL Ecological Research Associates, Bryan, TX 77802, USA
Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA.
J Exp Biol. 2020 Feb 25;223(Pt 4):jeb218735. doi: 10.1242/jeb.218735.
The use of 'map-like' information from the Earth's magnetic field for orientation has been shown in diverse taxa, but questions remain regarding the function of such maps. We used a 'magnetic displacement' experiment to demonstrate that juvenile pink salmon () use magnetic cues to orient. The experiment was designed to simultaneously explore whether their magnetic map is used to direct fish (i) homeward, (ii) toward the center of their broad oceanic range or (iii) along their oceanic migratory route. The headings adopted by these navigationally naive fish coincided remarkably well with the direction of the juveniles' migration inferred from historical tagging and catch data. This suggests that the large-scale movements of pink salmon across the North Pacific may be driven largely by their innate use of geomagnetic map cues. Key aspects of the oceanic ecology of pink salmon and other marine migrants might therefore be predicted from magnetic displacement experiments.
已经在不同的分类群中证明了利用地球磁场的“地图样”信息进行定向，但对于这种地图的功能仍存在疑问。我们使用“磁位移”实验证明了幼年粉鲑（Oncorhynchus gorbuscha）利用磁场线索进行定向。该实验旨在同时探索它们的磁图是否用于引导鱼类（i）回家，（ii）朝向其广阔海洋范围的中心，或（iii）沿着其海洋洄游路线。这些导航经验不足的鱼类采用的标题与从历史标记和捕捞数据推断出的幼鱼洄游方向非常吻合。这表明，北太平洋大鳞大麻哈鱼的大规模洄游可能主要是由其对地磁图线索的先天利用驱动的。因此，从磁位移实验可以预测粉鲑和其他海洋洄游鱼类的海洋生态的关键方面。
