Novel chytrid lineages dominate fungal sequences in diverse marine and freshwater habitats

In aquatic environments, fungal communities remain little studied despite their taxonomic and functional diversity. To extend the ecological coverage of this group, we conducted an in-depth analysis of fungal sequences within our collection of 3.6 million V4 18S rRNA pyrosequences originating from 3...

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Bibliographic Details
Published in:Scientific reports 2016-07, Vol.6 (1), p.30120-30120, Article 30120
Main Authors: Comeau, André M., Vincent, Warwick F., Bernier, Louis, Lovejoy, Connie
Format: Article
Language:English
Subjects:
45/77
45/91
631/158/670
631/158/855
704/158/855
704/286
704/829/826
Arctic Regions
Chytridiomycota - genetics
Ecosystem
Fresh Water - microbiology
Fungi - genetics
Humanities and Social Sciences
Ice Cover - microbiology
multidisciplinary
Phylogeny
Phytoplankton - microbiology
RNA, Ribosomal, 18S - genetics
Science
Science (multidisciplinary)
Seawater - microbiology
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Summary:In aquatic environments, fungal communities remain little studied despite their taxonomic and functional diversity. To extend the ecological coverage of this group, we conducted an in-depth analysis of fungal sequences within our collection of 3.6 million V4 18S rRNA pyrosequences originating from 319 individual marine (including sea-ice) and freshwater samples from libraries generated within diverse projects studying Arctic and temperate biomes in the past decade. Among the ~1.7 million post-filtered reads of highest taxonomic and phylogenetic quality, 23,263 fungal sequences were identified. The overall mean proportion was 1.35%, but with large variability; for example, from 0.01 to 59% of total sequences for Arctic seawater samples. Almost all sample types were dominated by Chytridiomycota-like sequences, followed by moderate-to-minor contributions of Ascomycota, Cryptomycota and Basidiomycota. Species and/or strain richness was high, with many novel sequences and high niche separation. The affinity of the most common reads to phytoplankton parasites suggests that aquatic fungi deserve renewed attention for their role in algal succession and carbon cycling.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep30120