Abstract
Our research was motivated by significant warming in the Arctic in recent decades and the influence of this warming on diatoms, which are the main producers in the seas of the Eastern Arctic. For this purpose, we studied the qualitative concentrations and quantitative ratio of diatoms from the surface sediments of the Laptev Sea (LS), the East Siberian (ESS) and Chukchi seas (ChS), and the Arctic Ocean (AO), obtained by box corers in 2016 and 2018. The ecological structure of the diatom assemblages of these sediments, reflecting the current environmental conditions, was also analyzed. Compared with the end of the last century, there were significant changes in species composition and quantitative ratio of the diatom assemblages in the sediments from the AO and the LS and ESS. In contrast, the diatom assemblages in the sediments from the ChS had not significantly changed in terms of species composition or quantitative ratio over the same three decades. The observed transformations in the diatom assemblages of the surface sediments were associated with substantial changes in water temperature, current flow, salinity, ice melting, and prolonged ice-free periods associated with global warming in the Northern Hemisphere in recent decades. The foregoing processes have clearly had strong impacts on the environment and the biota of the Arctic region.
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Data availability
The datasets generated during and/or analyzed during the current study are available in supplementary information or from the corresponding author on reasonable request.
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Acknowledgements
The authors thank Prof. A.S. Astakhov and Dr. A.A. Bosin for providing the sediment samples. Special thanks to L.V. Osipova for processing the samples and preparing diatom slides as well as to Drs. R.M. Gogorev, A.N. Kolesnik, and S.A. Selytin for their scientific input.. We are grateful to the editor Dr. D. Piepenburg, Dr. A. Yu. Gladenkov and one anonymous reviewer for their detailed and constructive comments that helped to improve this manuscript. We thank Y. Sujeen for her invaluable help.
Funding
This work was funded by the Russian Science Foundation (Project No. 21-17-00081). The expeditions were supported by the Fundamental Research of POI FEB RAS (Project No. 121021700342-9) and the National Natural Science Foundation of China (Grants No. 42130412, 42176245).
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AK analyzed the diatom samples, MO and IT analyzed the diatom samples and prepared the manuscript, XS and YL organized the expeditions and critically revised the manuscript. All authors read and approved the manuscript.
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Obrezkova, M.S., Tsoy, I.B., Kolyada, A.E. et al. Distribution of diatoms in seafloor surface sediments of the Laptev, East Siberian, and Chukchi seas: implication for environmental reconstructions. Polar Biol 46, 21–34 (2023). https://doi.org/10.1007/s00300-022-03105-5
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DOI: https://doi.org/10.1007/s00300-022-03105-5