Abstract
We present the first study on the quantity and diversity of the mycobiota in bottom sediments of the Chukchi Sea. During implementation of the RUSALCA-2012 program, 22 samples of bottom sediments from depths of 44–110 m were collected in late August–early September 2012. Fungi were isolated on agarized media (salinity 35 psu, temperature 6°C). Species identification was performed by morphological-cultural and molecular-genetic methods based on the nucleotide sequences of ITS1-ITS2 rDNA. A total of 128 colonies of mycelial fungi were isolated; 0 to 22 propagules were obtained from each 1 cm3 sample. The overall diversity was represented by 48 morphotypes belonging to 32 genera in 15 orders of ascomycetes and basidiomycetes. Ascomycetes predominated both in number and diversity. A number of species were found in marine ecosystems for the first time. The taxonomic position of nonsporulating isolates (13% of the total) was established using molecular techniques. Among them, high diversity was observed in the orders Pleosporales and Helotiales (Ascomycota).
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