位于食物链顶端的食肉动物对维持生态系统的功能和健康扮演着重要的作用。探究形态与食性相似的同域物种竞争与共存问题一直是保护生物学的核心科学问题。处于相似生态位的竞争性物种需要从空间、时间或资源生态位上进行分化，从而达到共存。然而许多食肉动物密度低、夜间活动和行为神秘，对他们的竞争与共存机制缺乏系统理解。本项目依托“中国东北虎豹生物多样性长期定位监测网络”，应用大尺度红外相机监测数据，并基于多物种占域研究的设计框架，以东北虎豹国家公园内的7种主要食肉动物作为对象，研究食物资源（上行效应）和大型捕食者的捕食风险（下行效应）对小型食肉动物的空间分布的影响。从空间生态位、时间生态位和营养（食性）生态位三个维度，研究食肉动物在人类活动影响下的种间相互作用和促进同域的行为机制。研究结果将有助于深入理解食肉动物群落组装和维持，并将为东北虎豹国家公园食肉动物的保护和管理提供科学基础。

Species interactions as one of the central topics in ecology and conservation biology are fundamentally important in maintaining ecosystem functions and well-being. Species within a guild vary their use of time, space and resources, thereby enabling sympatry. Despite this, the mechanisms of carnivore interactions are not well understood due to the complexity of carnivore guild dynamics and how they can be impacted by ecological and human factors. The study based on the Long-term Tiger Leopard Observation Network in NE China. We assessed mechanisms of facilitating sympatry among seven carnivores in the Northeast Tiger-Leopard National Park using camera-trap surveys and occupancy model. We examined population-level temporal, spatial and dietary segregation or overlap among them. The results of our research will inform science-based conservation strategies for integrating carnivores persistence and recovery into a regional landscape-scale.