Dendritic habitats, such as river ecosystems, promote the persistence of species by favouring spatial asynchronous dynamics among branches. Yet, our understanding of how network topology influences metapopulation synchrony in these ecosystems remains limited. Here, we introduce the concept of fluvial synchrogram to formulate and test expectations regarding the geography of metapopulation synchrony across watersheds. By combining theoretical simulations and an extensive fish population time‐series dataset across Europe, we provide evidence that fish metapopulations can be buffered against synchronous dynamics as a direct consequence of network connectivity and branching complexity. Synchrony was higher between populations connected by direct water flow and decayed faster with distance over the Euclidean than the watercourse dimension. Likewise, synchrony decayed faster with distance in headwater than mainstem populations of the same basin. As network topology and flow directionality generate fundamental spatial patterns of synchrony in fish metapopulations, empirical synchrograms can aid knowledge advancement and inform conservation strategies in complex habitats.

中文翻译：

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树突状河网中种群同步的地理

树枝状生境（例如河流生态系统）通过促进分支之间的空间异步动态来促进物种的持久性。但是，我们对网络拓扑结构如何影响这些生态系统中的种群同步的理解仍然有限。在这里，我们介绍河流同步图的概念对跨流域的跨种群同步地理学制定和测试期望。通过将理论模拟与整个欧洲广泛的鱼类种群时间序列数据集相结合，我们提供了证据，可以证明鱼类种群可以针对同步动态进行缓冲，这是网络连通性和分支复杂性的直接结果。通过直接水流连接的种群之间的同步性更高，并且在欧几里得距离上的衰减比水道维数更快。同样，源头距离的同步性衰减快于同一盆地的主干种群。由于网络拓扑和流动方向性在鱼类种群中产生了基本的同步空间格局，