Abstract Evidence is mounting that the structures of trophic networks are governed by migratory movements of interacting species and also by their phylogenetic relationships. Using the largest available trophic network of a large steppe ecosystem, we tested that steppe trophic networks including migratory species are associated with (i) migratory strategy and (ii) phylogenetic relatedness of interacting species: (1) whole graph-level metrics, estimated as modularity, and (2) species-level network metrics, measured as node degree (number of interacting partners), and centrality metrics. We found that (1) a substantial number of links were established by migrant taxa; (2) the phylogenetic signal in network structure was moderate for both consumer and prey nodes; (3) both consumer and prex phylogenies affected modularity, which was modulated by migration strategy; and (4) all species-level graph properties significantly differed between networks including and excluding migratory taxa. In sum, here we show that the structure of steppe trophic networks is primarily governed by migratory strategies and to a lesser extent, by phylogenetic relatedness, using the largest available food web representative for steppe ecology and migration biology.

中文翻译：

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营养网络的模块化是由草原生态系统中的系统发育和迁移驱动的

摘要 越来越多的证据表明，营养网络的结构受相互作用物种的迁徙运动及其系统发育关系的支配。使用大型草原生态系统的最大可用营养网络，我们测试了包括迁徙物种在内的草原营养网络与（i）迁徙策略和（ii）相互作用物种的系统发育相关性相关：（1）整个图级指标，估计为模块化，以及 (2) 物种级网络度量，以节点度（交互伙伴的数量）和中心性度量来衡量。我们发现（1）大量的联系是由移民类群建立的；(2)消费者和猎物节点的网络结构系统发育信号适中；(3) 消费者和前置系统发育都影响模块化，受迁移策略调节；(4) 所有物种级别的图属性在包括和不包括迁徙类群的网络之间都有显着差异。总之，在这里我们表明草原营养网络的结构主要受迁徙策略控制，并在较小程度上受系统发育相关性的控制，使用最大的可用食物网代表草原生态学和迁徙生物学。