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Abstract：
Fungi are among key actors in the biogeochemical processes occurring in mangrove ecosystems. In this study, we investigated the changes of fungal communities in selected mangrove species by exploring differences in diversity, structure and the degree of ecological rearrangement occurring within the rhizospheres of four mangrove species (Sonneratia alba, Rhizophora mucronata, Ceriops tagal and Avicennia marina) at Gazi Bay and Mida Creek in Kenya. Alpha diversity investigation revealed that there were no significant differences in species diversity between the same mangrove species in the different sites. Rather, significant differences were observed in fungal richness for some of the mangrove species. Chemical parameters of the mangrove sediment significantly correlated with fungal alpha diversity and inversely with richness. The fungal community structure was significantly differentiated by mangrove species, geographical location and chemical parameters. Taxonomic analysis revealed that 96% of the amplicon sequence variants belonged to the Phylum Ascomycota, followed by Basidiomycota (3%). Predictive FUNGuild and co-occurrence network analysis revealed that the fungal communities in Gazi Bay were metabolically more diverse compared to those of Mida Creek. Overall, our results demonstrate that anthropogenic activities influenced fungal richness, community assembly and their potential ecological functions in the mangrove ecosystems investigated.
摘要：
真菌是红树林生态系统中发生的生物地球化学过程的关键参与者。在这项研究中,我们通过探索多样性差异来调查选定红树林物种中真菌群落的变化，在四个红树林物种的根际内发生的结构和生态重排程度（Sonneratiaalba，小豆根,Ceriopstagal和Avicennia码头）在肯尼亚的Gazi湾和MidaCreek。Alpha多样性调查显示，不同地点的同一红树林物种之间的物种多样性没有显着差异。相反，某些红树林物种的真菌丰富度存在显着差异。红树林沉积物的化学参数与真菌α多样性显着相关，与丰富度成反比。真菌群落结构因红树林种而显著分化,地理位置和化学参数。分类学分析表明，96％的扩增子序列变体属于子囊毛竹，其次是担子菌(3%)。预测性FUNGuild和共现网络分析显示，与MidaCreek相比，Gazi湾的真菌群落在代谢上更加多样化。总的来说,我们的结果表明，人为活动影响真菌丰富度，研究了红树林生态系统中的群落聚集及其潜在的生态功能。
