长尾林鸮（Strix uralensis）是一种中型猛禽，属于鸮形目（Strigiformes）鸱 鸮科（Strigidae）林鸮属（Strix），具有强烈的领域性，在繁殖季占有交配、筑巢、 繁殖型领域。其在繁殖季期间有明确的雌雄分工，雌鸟负责巢防御以及育雏，雄 鸟负责领域防御以及食物供给。笔者于 2021 年 3 月至 7 月在吉林省吉林市永吉 县大岗子林场对长尾林鸮繁殖季内的领域选择和领域行为进行了实验观察。首次 揭示了吉林地区长尾林鸮一个完整繁殖季的领域面积和领域行为模式变化，并对 影响这一模式的因素进行了分析。主要研究结果如下：（1）长尾林鸮的领域面积 在繁殖季前后存在着显著的差异（t = 6.2393, df =16, p-value 0.05）（4）协方差相关性分析显示巢防御行为的强 度明显与窝卵数和育雏数呈正相关性，而领域防御行为的强度则与其呈负相关性， 说明防御强度与繁殖成效有很大关系，且雌雄鸟各自具有不同的选择策略。

Ural Owl (Strix uralensis) is a medium size raptor belonging to the genus Strix. It has a strong sense of territoriality and will hold a territory using for mating, nesting, and breeding. Ural owls take a clear division of labor between males and females during the breeding season. Females will defense the nest and incubate the eggs, while males will defense the territory and supply food. The field study is taken in Dagangzi forest, Yongji County, Jilin City, Jilin Province from March to July, 2021, to observe the territorial behaviors of the Ural Owl around the breeding season. In this paper, we reveal the variation of strategy of territoriality in a complete breeding season of ural owl in Jilin for the first time and discuss the factors that affect the choice of strategy. The main results of this paper are as follows: (1) Significant differences exist in the territory area before and after the breeding season (t = 6.2393, df =16, p-value 0.05). (4) Covariance correlation analysis shows that the intensity of nest defense behavior is positively correlated with the number of eggs and offspring, while the intensity of territory defense behavior is iii negatively correlated with the number of offspring. These results indicate that the choice of territory strategy is closely related to reproductive success, and male and female birds have different strategies.