Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
Department of Mathematics and Statistics, University of Alaska Fairbanks, Fairbanks, AK 99775, USA.
Proc Biol Sci. 2018 Nov 7;285(1890):20181779. doi: 10.1098/rspb.2018.1779.
For migrating animals, realized migration routes and timing emerge from hundreds or thousands of movement decisions made along migration routes. Local weather conditions along migration routes continually influence these decisions, and even relatively small changes in weather may cumulatively result in major shifts in migration patterns. Here, we analysed satellite tracking data to score a discrete navigation decision by a large migratory bird as it navigated a high-latitude, 5000 m elevation mountain range to understand how those navigational decisions changed under different weather conditions. We showed that wind conditions in particular areas along the migration pathway drove a navigational decision to reroute a migration; conditions encountered predictably resulted in migrants routing either north or south of the mountain range. With abiotic conditions continuing to change globally, simple decisions, such as the one described here, might additively emerge into new, very different migration routes.
对于迁徙动物来说，实际的迁徙路线和时间是由数百甚至数千次沿着迁徙路线做出的运动决策产生的。迁徙路线上的当地天气条件不断影响这些决策，即使天气的微小变化也可能累积导致迁徙模式的重大转变。在这里，我们分析了卫星跟踪数据，对一只大型候鸟在穿越高纬度、海拔 5000 米的山脉时的一个离散导航决策进行评分，以了解在不同天气条件下这些导航决策是如何变化的。我们表明，特别是在迁徙路径上的特定区域的风况会导致候鸟改变迁徙路线的导航决策；可预测的情况导致候鸟选择沿着山脉的北部或南部迁徙。随着全球生物条件的持续变化，像这里描述的那样简单的决策可能会逐渐形成新的、非常不同的迁徙路线。
