Changes in the foliar fungal community between oak leaf flushes along a latitudinal gradient in Europe

Aim: To advance our understanding of how foliar fungal communities are structured and assembled, we assessed to what extent leaf flush and latitude can explain the within- and among-tree variation in the foliar fungal community in a foundation tree species, the pedunculate oak Quercus robur. Location: A latitudinal gradient spanning c. 20 degrees in latitude in Europe. Major taxa studied: The foliar fungal community on Quercus robur. Methods: We examined the main and interactive effects of leaf flush and latitude on the foliar fungal community by sampling 20 populations of the pedunculate oak Quercus robur across the tree’s range, spanning c. 20 degrees in latitude. Results: Species composition, but not species richness, differed between leaf flushes. Across the latitudinal gradient, species richness was highest in the central part of the oak’s distributional range, and foliar fungal community composition shifted along the latitudinal gradient. Among fungal guilds, the relative abundanc...研究目的：为深入阐释叶真菌群落的构建与组织机制，本研究以建群树种有柄栎（Quercus robur）为对象，探究叶片展叶期与纬度对其叶真菌群落在树内及树间变异的解释程度。 研究区域：横跨欧洲约20个纬度的纬度梯度样带。 研究类群：有柄栎（Quercus robur）的叶真菌群落。 研究方法：我们在有柄栎的自然分布范围内，沿跨约20个纬度的梯度采集了20个种群样本，以此分析叶片展叶期与纬度对叶真菌群落的主效应及交互效应。 研究结果：不同叶片展叶期的真菌群落物种组成存在显著差异，但物种丰富度无显著变化。沿纬度梯度分布时，叶真菌物种丰富度在有柄栎分布范围的中部区域达到峰值，且群落组成随纬度梯度发生系统性偏移。在真菌功能群中，相对丰度……