Abstract
Diatom species counts were conducted on 171 sediment samples from the 13-m-long core PG1351 from Lake El’gygytgyn, northeast Siberia. The planktonic Cyclotella ocellata-complex dominates the diatom assemblage through most of the core record, persisting through a variety of climate conditions. Periphytic diatoms, although less abundant, have greater diversity and greater down-core assemblage variation. During warm climate modes, longer summer ice-free conditions may have allowed more complex diatom communities to develop in shallow-water habitats, and enhanced circulation may have increased transport of these diatoms to deeper parts of the lake. Zones of low overall diatom abundance further support inferred intervals of low lake productivity during times of extended lake ice and snow cover. More data on the modern spatial and temporal distribution of diatom species in the Lake El’gygytgyn system will improve inferences from core records.
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Acknowledgements
This research was supported by grants to J. Brigham-Grette (NSF OPP 96-15768, ATM 99-05813), grants to Martin Melles (BMBF 03G0586A, B), and a grant to Marina Cherapanova (RFBR 03-05-65240). We thank H. Cremer and S. Fritz for their helpful reviews of the manuscript.
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This is the last in a series of eleven papers published in this␣special issue dedicated to initial studies of El'gygytgyn Crater Lake and its catchment in NE Russia. Julie Brigham-Grette, Martin Melles, Pavel Minyuk were guest editors of this special issue.
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Cherapanova, M.V., Snyder, J.A. & Brigham-Grette, J. Diatom stratigraphy of the last 250 ka at Lake El’gygytgyn, northeast Siberia. J Paleolimnol 37, 155–162 (2007). https://doi.org/10.1007/s10933-006-9019-4
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DOI: https://doi.org/10.1007/s10933-006-9019-4