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Metabarcoding-based fungal diversity on coarse and fine particulate organic matter in a first-order stream in Nova Scotia Canada

机译：加拿大新斯科舍省一级流中基于粗条形码的真菌多样性对粗粒和细粒有机物的影响

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Most streams receive substantial inputs of allochthonous organic material in the form of leaves and twigs (CPOM >, coarse particulate organic matter). Mechanical and biological processing converts this into fine particulate organic matter (FPOM). Other sources of particles include flocculated dissolved matter and soil particles. Fungi are known to play a role in the CPOM conversion process, but the taxonomic affiliations of these fungi remain poorly studied. The present study seeks to shed light on the composition of fungal communities on FPOM and CPOM as assessed in a natural stream in Nova Scotia, Canada. Maple leaves were exposed in a stream for four weeks and their fungal community evaluated through pyrosequencing. Over the same period, four FPOM size fractions were collected by filtration and assessed. Particles had much lower ergosterol contents than leaves, suggesting major differences in the extent of fungal colonization. Pyrosequencing documented a total of 821 fungal operational taxonomic units (OTU), of which 726 were exclusive to particles and 47 to leaf samples. Most fungal phyla were represented, including yeast lineages (e.g., Taphrinaceae and Saccharomycotina), Basidiomycota, Chytridiomycota and Cryptomycota, but several classes of Pezizomycontina (Ascomycota) dominated. Cluster dendrograms clearly separated fungal communities from leaves and from particles. Characterizing fungal communities may shed some light on the processing pathways of fine particles in streams and broadens our view of the phylogenetic composition of fungi in freshwater ecosystems.
机译：大多数流都以叶和细枝的形式（CPOM >，粗颗粒有机物）形式接受大量的异源有机物质输入。机械和生物处理将其转化为细颗粒有机物（FPOM）。颗粒的其他来源包括絮凝的溶解物和土壤颗粒。已知真菌在CPOM转换过程中起作用，但是这些真菌的分类学联系仍然研究不足。本研究旨在阐明在加拿大新斯科舍省自然流中评估的FPOM和CPOM上真菌群落的组成。枫叶在溪流中暴露四个星期，并通过焦磷酸测序评估其真菌群落。在同一时期，通过过滤收集并评估了四个FPOM尺寸馏分。颗粒的麦角固醇含量比叶子低得多，表明真菌定植程度存在重大差异。焦磷酸测序记录了总共821个真菌操作分类单位（OTU），其中726个是颗粒物所独有的，而47个是叶样品中的。代表了大多数真菌门，包括酵母谱系（例如，塔弗纳科（Taphrinaceae）和酿酒酵母（Saccharomycotina）），担子菌科（Basidiomycota），梭菌属（Chytridiomycota）和隐孢子虫（Cryptomycota），但以几类Pezizomycontina（Ascomycota）为主。簇状图清楚地将真菌群落与叶子和颗粒分离。表征真菌群落可能会阐明细小颗粒在河流中的加工途径，并拓宽了我们对淡水生态系统中真菌的系统发育组成的看法。

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