Abstract Habitat loss can trigger migration network collapse by isolating migratory bird breeding grounds from nonbreeding grounds. Theoretically, habitat loss can have vastly different impacts depending on the site's importance within the migratory corridor. However, migration‐network connectivity and the impacts of site loss are not completely understood. We used GPS tracking data on 4 bird species in the Asian flyways to construct migration networks and proposed a framework for assessing network connectivity for migratory species. We used a node‐removal process to identify stopover sites with the highest impact on connectivity. In general, migration networks with fewer stopover sites were more vulnerable to habitat loss. Node removal in order from the highest to lowest degree of habitat loss yielded an increase of network resistance similar to random removal. In contrast, resistance increased more rapidly when removing nodes in order from the highest to lowest betweenness value (quantified by the number of shortest paths passing through the specific node). We quantified the risk of migration network collapse and identified crucial sites by first selecting sites with large contributions to network connectivity and then identifying which of those sites were likely to be removed from the network (i.e., sites with habitat loss). Among these crucial sites, 42% were not designated as protected areas. Setting priorities for site protection should account for a site's position in the migration network, rather than only site‐specific characteristics. Our framework for assessing migration‐network connectivity enables site prioritization for conservation of migratory species.

中文翻译：

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优先考虑候鸟保护工作的网络方法

摘要 栖息地丧失可通过将候鸟繁殖地与非繁殖地隔离开来引发迁徙网络崩溃。从理论上讲，栖息地丧失可能会产生截然不同的影响，具体取决于迁徙走廊内地点的重要性。然而，迁移网络连接和站点丢失的影响尚不完全清楚。我们使用亚洲飞行路线中 4 种鸟类的 GPS 跟踪数据来构建迁徙网络，并提出了一个评估迁徙物种网络连通性的框架。我们使用节点删除过程来确定对连接性影响最大的中途停留站点。一般来说，中途停留地点较少的迁徙网络更容易受到栖息地丧失的影响。按照栖息地丧失程度从高到低的顺序移除节点会产生类似于随机移除的网络阻力增加。相比之下，当按照从最高到最低的介数值（通过通过特定节点的最短路径的数量来量化）的顺序移除节点时，阻力增加得更快。我们量化了迁移网络崩溃的风险，并通过首先选择对网络连接有很大贡献的站点，然后确定哪些站点可能从网络中移除（即栖息地丧失的站点）来确定关键站点。在这些关键地点中，42% 未被指定为保护区。为站点保护设置优先级应考虑站点在迁移网络中的位置，而不仅仅是站点特定的特征。