Dispersal is a key process affecting the dynamic and genetic structure of populations. To increase our knowledge on first-year dispersal in the white-tailed eagle (WTE), 35 nestlings in the Czech Republic, Hungary, and Austria were equipped with GPS/GSM loggers while on the nest between 2016 and 2019. Twenty-nine individuals surviving until March 31 were used to assess post-fledging areas, first-year dispersal distance and direction, temporary settlement areas, and habitat selection. The first flight from the nest was observed between May 19 and July 8. Start of dispersal from post-fledging areas occurred between July 1 and November 14. Post-fledging areas were significantly larger in males (p = 0.001, median 1236 km², n = 15) than females (median 139 km², n = 12). Maximal dispersal distance ranged from 93 to 433 km from the native nest (median = 187 km) and did not correlate with Simpson’s Diversity Index computed for habitats in individual 100% minimum convex polygons (MCP). Median sizes of minimum convex polygons were 26,888 km² for 100% MCP and 13,376 km² for 95% MCP (n = 29). Median sizes of kernel density estimates (KDE) were 3393 km² for 80% KDE and 1137 km² for 50% KDE. After start of dispersal, young WTEs returned to the proximity of the parental nest for night roosting sporadically. No sex-specific differences in dispersal distance were recorded. While young individuals from the three subpopulations are likely to occur in the same area during the first year of life, future nesting site identification will enable us to assess real gene flow and the connectivity level among them. As this study has illustrated, future conservation efforts to protect young WTEs will require cross-border cooperation.

传播是影响种群动态和遗传结构的关键过程。为了增加我们对白尾鹰（WTE）的第一年传播的了解，2016年至2019年之间，在捷克共和国，匈牙利和奥地利的35个雏鸟中，有35只雏鸟配备了GPS / GSM记录仪。直到3月31日的存活时间用于评估后迁飞地区，第一年的扩散距离和方向，临时定居地区以及栖息地选择。在5月19日至7月8日之间观察到了从巢中的第一次飞行。7月1日至11月14日是从出雏后地区开始驱散的情况。雄鸟的出雏后面积明显更大（p = 0.001，中位数1236 km ²，n = 15），比女性（中位数139公里）²，n = 12）。距原生巢的最大散布距离为93至433 km（中位数= 187 km），并且与针对单个100％最小凸多边形（MCP）中的栖息地计算出的辛普森多样性指数不相关。对于100％MCP ，最小凸多边形的中位数大小为26,888 km ²，对于95％MCP ，最小凸多边形的中位数大小为13,376 km ²（n = 29）。核密度估计（KDE）的中位数大小为3393公里²为80％KDE和1137公里²可获得50％的KDE。驱散开始后，年轻的WTE会回到父母巢附近，零星地栖息。在分散距离上没有性别差异的记录。虽然这三个亚群的年轻人可能会在生命的第一年中出现在同一地区，但未来的筑巢位点识别将使我们能够评估实际的基因流量及其之间的连通性水平。正如该研究表明的那样，未来为保护年轻的WTE而开展的保护工作将需要跨界合作。