AimPlant recruitment involves both stochastic and deterministic processes. Recruits may establish independently or interact nonrandomly with canopy plants. We explore this deterministic aspect by testing whether recruitment patterns are influenced by the phylogenetic history of canopy and recruiting plants. Since the effect of canopy plants in recruitment can be positive (facilitation), negative (competition) or neutral, we also estimated the phylogenetic signal separately for each interaction type. Furthermore, we assessed whether environmental stress influenced the phylogenetic signal, under the expectation that more severe environmental conditions will lead to stronger phylogenetic signatures in network structure.LocationGlobal.Time Period1998–2021.Major Taxa StudiedAngiospermae.MethodsWe analysed recruitment interactions occurring in 133 plant communities included in the RecruitNet database, which encompasses a wide range of biomes and vegetation types. The phylogenetic signal in canopy–recruit interactions was quantified in different dimensions of the recruitment niche, represented by the level of interaction generalisation, and by the taxonomic and evolutionary composition of the group of canopy plants.ResultsWe found significant phylogenetic signals in more networks than expected by chance. Canopies’ evolutionary history influenced facilitative and competitive but not neutral interactions. The phylogenetic signal in the recruitment niche strengthened in arid regions, suggesting that stressful habitats promote the occurrence of conserved recruitment interactions where closely related species recruit in association with closely related canopy species.Main ConclusionsDespite the strong influence of stochastic processes on plant recruitment, evolutionary history plays a significant role in driving the recruitment process, especially in harsh environments. In particular, the historical effect becomes more important when canopy species have a significant impact on the performance of recruits, either through facilitation or competition. More generally, we show that the analysis of different dimensions of the ecological niche can reveal important insights on the functional roles of interacting species.

中文翻译：

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招募网络的系统发育架构


AimPlant 招募涉及随机和确定性过程。新兵可以独立建立或非随机地与树冠植物互动。我们通过测试招募模式是否受到冠层和招募植物的系统发育历史的影响来探索这一确定性方面。由于冠层植物在补充中的影响可以是积极的（促进）、消极的（竞争）或中性的，我们还分别估计了每种交互类型的系统发育信号。此外，我们评估了环境压力是否影响系统发育信号，预期更恶劣的环境条件将导致网络结构中更强的系统发育特征。位置Global.Time Period1998–2021.Major Taxa StudiedAngiospermae.Methods我们分析了 RecruitNet 数据库中包含的 133 个植物群落中发生的补充相互作用，该数据库包括广泛的生物群落和植被类型。冠层-新冠互作中的系统发育信号在募集生态位的不同维度上被量化，由相互作用泛化的水平以及冠层植物组的分类和进化组成表示。结果我们在比预期的更多的网络中偶然发现了显着的系统发育信号。树冠的进化历史影响了促进性和竞争性互动，但不是中立的互动。在干旱地区，补充生态位中的系统发育信号加强，这表明压力栖息地促进了保守补充相互作用的发生，其中密切相关的物种与密切相关的树冠物种一起招募。主要结论尽管随机过程对植物招募有很大影响，但进化历史在驱动招募过程中起着重要作用，尤其是在恶劣的环境中。特别是，当冠层物种通过促进或竞争对新兵的表现产生重大影响时，历史效应变得更加重要。更一般地说，我们表明，对生态位不同维度的分析可以揭示有关相互作用物种功能作用的重要见解。