Systematic analyses of long-term data document shifting migration routes and earlier departures and arrivals, as well as suggesting a loss of synchrony between the migrant and its food source.

• 对长期观测数据的系统分析后，迁徙路线的改变和到达或离开时间的提前得到了证明，并提出迁徙物种和它们的食物来源同时减少。