Species restoration through reintroduction and reinforcement is widely considered as an effective method for the conservation of threatened animals. Although these approaches have been increasingly implemented over the last half-century, many attempts have failed. Dispersal behaviour is one of the key factors determining reintroduction success. We reported the demographic composition and dispersal pattern (i.e., post-release and natal dispersal) of a reintroduced Oriental Stork Ciconia boyciana population in Japan and identified the determinants of breeding success in 2005–2019. We hypothesized that one of the key determinants of breeding success is the density-dependent effect through post-release and natal dispersal. The F1 generation occurrence corresponded to two years, F2 to seven, F3 to 11, and F4 to 14 years after initial reintroduction. Wild-born birds accounted for 74% of the reintroduced population at F4 occurrence. Post-release dispersal distances were shorter than natal dispersal. Inter-nest distance was selected as the key factor determining breeding success. These results may have been due to feeding habitat restoration and conspecific interactions. In conclusion, steady recruitment to the next generation is thought to be due to a moderate natal dispersal and the subsequent low breeding density of wild-born birds.

通过重新引入和加强物种恢复被广泛认为是保护受威胁动物的有效方法。尽管这些方法在过去半个世纪中得到越来越多的实施，但许多尝试都失败了。散布行为是决定放归成功的关键因素之一。我们报告了重新引入的东方鹳Ciconia boyciana的人口组成和扩散模式（即，释放后和出生后的扩散）并确定了 2005-2019 年育种成功的决定因素。我们假设繁殖成功的关键决定因素之一是通过释放后和出生后扩散的密度依赖性效应。F1 代发生对应于最初重新引入后的两年，F2 到 7 年，F3 到 11 年，F4 到 14 年。野生鸟类占 F4 发生时重新引入种群的 74%。释放后的扩散距离比出生后的扩散距离短。选择巢间距离作为决定繁殖成功的关键因素。这些结果可能是由于饲养栖息地恢复和同种相互作用。总之，对下一代的稳定补充被认为是由于适度的出生分散和随后野生鸟类的低繁殖密度。