Fungal communities in Scandinavian lakes along a longitudinal gradient
2017
Abstract This study investigates the diversity and distribution of fungal communities in 77 oligotrophic lakes in southern Norway and Sweden using 454-sequencing with fungal-specific primers targeting ITS2 region of the rRNA gene. A total of 232
operational taxonomic units(OTUs) belonging to four recognized phyla were detected. A large proportion (70.69%) of the detected OTUs were
Dikarya(
Ascomycotaand
Basidiomycota), while
Chytridiomycotadominated quantitatively (63.37% reads). The most abundant
aquaticfungi were taxonomically assigned to
Chytridiomycota, whose members are known to be saprobes on a large variety of substrates and parasites of phytoplankton, zooplankton, fungi and invertebrates, suggesting that resident fungi strictly depend on surfaces and, therefore, are closely associated with other types of
aquaticorganisms. Our results indicate that surface waters of oligotrophic lakes harbour a diverse pool of fungi, both with tentative terrestrial and true
aquaticorigin. Longitude and environmental factors were important in structuring the fungal community composition.
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