本项目运用无线电遥测技术和稳定性同位素示踪技术研究长尾林鸮（Strix uralensis）的扩散模式和食物链特征。通过对长尾林鸮扩散个体的身体特征差异、性别差异、扩散距离的差异和扩散过程中栖息地的差异总结出该物种的扩散模式，分析扩散行为的进化机制，归纳出该物种产生扩散行为的内在因素和外在影响。由于长尾林鸮是生态系统中营养级的顶级消费者，运用稳定性同位素示踪法通过对长尾林鸮食物链特征的分析，探讨该物种在生物群落中的调控作用，同时分析扩散到新环境中的长尾林鸮个体的食物链结构及对新环境中动物群落的效应。通过本项目的实施，不但可以补充已有的扩散假说和生态系统食物网理论，还可为保护和管理这一生态系统中的顶级消费者提供科学依据。

Dispersal model and food chain characteristics of the Ural Owl (Strix uralensis) are studied by using Radio Telemetry and Stable Isotope methods. The dispersal model and its evolutionary mechanism of the bird will be analyzed though the differences of body, sex, dispersal distance and habitat characteristics. We will assess the effects of intrinsic and extrinsic factors on dispersal behavior. Because the owl is a top consumer in ecosystem, we will evaluate the controlling effect of this bird’s food chain using Stable Isotope method. Also, the controlling effect of the dispersal individuals in new habitat is evaluated. Not only do we enrich the early theories of dispersal and food chain, but make for top consumer conservation in this project.