ABSTRACT

Fungi have a huge biodiversity and play important roles in soil biogeochemical cycling in island ecosystems. Although island biogeography has been widely studied for macroorganisms, fungal community assembly in true islands and its relationship with island area are less documented. We examined soil fungal communities in 18 oceanic islands of two types (eight non-coral islands and 10 coral islands) using the Illumina MiSeq sequencing technique. Our results showed that fungal α-diversity (species richness) was substantially different among the oceanic islands, with a higher value in non-coral islands than in coral islands. Fungal α-diversity was significantly affected by soil potassium and magnesium (Mg) and plant communities in non-coral islands, whereas only soil Mg significantly affected it in coral islands. Soil fungal community composition was significantly different in the non-coral and coral islands and was influenced by soil property, plant community and spatial distance. The ecological stochasticity model showed that the fungal community assembly was mainly governed by deterministic processes regardless of island type. Fungal β-diversity, but not α-diversity, increased significantly with increasing island area. These findings have implications for the better prediction of soil fungal community dynamics in island systems and biodiversity conservation in fragmented habitats.

中文翻译：

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土壤真菌多样性和群落聚集：受岛屿大小或类型影响吗？

摘要

真菌具有巨大的生物多样性，并在岛屿生态系统中的土壤生物地球化学循环中发挥重要作用。尽管岛生物地理学已被广泛研究用于大生物，但真正的岛上的真菌群落聚集及其与岛面积的关系却鲜有记载。我们使用Illumina MiSeq测序技术检查了两种类型的18个海洋岛（8个非珊瑚岛和10个珊瑚岛）中的土壤真菌群落。我们的研究结果表明，海洋岛屿之间的真菌α多样性（物种丰富度）存在显着差异，在非珊瑚岛上的价值高于在珊瑚岛上的价值。在非珊瑚岛上，真菌α-多样性受到土壤钾和镁（Mg）和植物群落的显着影响，而在珊瑚岛上，仅土壤Mg对其影响显着。非珊瑚岛和珊瑚岛的土壤真菌群落组成显着不同，并受土壤性质，植物群落和空间距离的影响。生态随机性模型表明，无论岛屿类型如何，真菌群落的组装主要由确定性过程控制。真菌的β多样性，而不是α多样性，随岛面积的增加而显着增加。这些发现对更好地预测岛屿系统中土壤真菌群落的动态以及零散的生境中生物多样性的保护具有重要意义。生态随机性模型表明，无论岛屿类型如何，真菌群落的组装主要由确定性过程控制。真菌的β多样性，而不是α多样性，随岛面积的增加而显着增加。这些发现对更好地预测岛屿系统中土壤真菌群落的动态以及零散的生境中生物多样性的保护具有重要意义。生态随机性模型表明，无论岛屿类型如何，真菌群落的组装主要由确定性过程控制。真菌的β多样性，而不是α多样性，随岛面积的增加而显着增加。这些发现对更好地预测岛屿系统中土壤真菌群落的动态以及零散的生境中生物多样性的保护具有重要意义。