Abstract
The major part of the north polar region is intensely rising by postglacial crustal movement. This process gives rise to the separation of different basins from seas and oceans, which affects a combination of freshwater and marine organisms. Gradually losing contact with the seas, many near-shore lakes of the Arctic are mostly desalted and form bogs. Fungi as decomposers play an important role in all ecosystems. However, the diversity and role of fungi in Arctic aquatic ecosystems is largely unknown. It is also not clear how the taxonomic structure of the fungal community is affected by the process of gradual desalinization and waterlogging. We investigated the diversity of filamentous culturable fungi in different parts of the brackish Kislo-Sladkoe Lake (White Sea, Russia). Annually, 42 samples of the bottom and coastal soils have been collected at the lake from which fungi were recovered on standard and selective media. Based on morphological and molecular markers, a total of 127 taxa have been identified. The fungal community appeared to be influenced by its sea origin and comprised both marine (Paradendryphiella salina, Acremonium spp.) and terrestrial soil species of Penicillium, Talaromyces, Mucor, Umbelopsis, Cladosporium, Cadophora, Sistotrema, Helotiales, Pleosporales, sphagnum moss destructors (Oidiodendron spp.) and insect-associated species of Tolypocladium. The results indicate that the composition of the fungal community in the rising polar White Sea region reflects the dynamics of global changes in physical–chemical parameters and animal and plant associations because of separation from the sea.
Highlights
Some Arctic oceanic and marine coastal zones are intensely rising because of glacio-isostatic movement (Krasnova et al 2013)
We further explore the fungal biodiversity in the Kislo-Sladkoe Lake, which is detaching from Kandalaksha Bay of the White Sea
This lake is a wellinvestigated site as a model of separating water reservoirs located in this region. It is located near the Pertsov White Sea Biological Station (WSBS; 66°34′N, 33°08′E; Online Resource 1) of the Lomonosov Moscow State University and is at an initial stage of peatland formation because of its shallow waters (4.5 m maximum depth)
Summary
Some Arctic oceanic and marine coastal zones are intensely rising because of glacio-isostatic movement (Krasnova et al 2013). The lakes that are separating from the White Sea combine both marine and continental features and represent a unique environmental niche. These basins are still connected to the sea in a varying degree, while having inflow of. This lake is a wellinvestigated site as a model of separating water reservoirs located in this region It is located near the Pertsov White Sea Biological Station (WSBS; 66°34′N, 33°08′E; Online Resource 1) of the Lomonosov Moscow State University and is at an initial stage of peatland formation because of its shallow waters (4.5 m maximum depth). The fungi were isolated from the peat, soil and sediment samples taken from the coast, littoral and bottom of the lake in 2008–2010. Abundance and spatial distribution of fungal species from different parts of the lake and related these data to the ecological peculiarities of the lake, such as its freshening and a contact with the Sea
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