Abstract
The Laptev Sea and the East Siberian Sea are remote areas of the Arctic region where detailed data on phytoplankton composition and spatial distribution remain limited. In the context of the ongoing environmental changes (increasing warming and ice melting) and prospective exploration activities (oil and gas production) on the Arctic shelves, understanding of the seasonal and interannual phytoplankton community dynamics is of critical importance. Our study provides new specifying data on species composition of phytoplankton over the vast area of the Laptev Sea shelf and the East Siberian Sea shelf. We found that the outer shelf of the Laptev and East Siberian seas was characterized by typical late spring diatom species (Chaetoceros furcellatus, Chaetoceros diadema, Chaetoceros debilis, Chaetoceros constrictus). On the inner shelf of the Laptev Sea, which is strongly affected by the Lena River water masses, the phytoplankton were characterized by the transition from the summer to an autumn stage of development. Local algal assemblages were composed by mixo- and heterotrophic dinoflagellates (Dinophysis and Protoperidinium genera) together with marine and brackish water-marine diatoms (Thalassiosira hyperborea, Thalassiosira baltica, Thalassiosira gravida, Thalassiosira nordenskioeldii) accompanied by sporadically occurring freshwater riverine planktonic diatom species (Aulacoseira granulata, Aulacoseira italica, Asterionella formosa). These variations in species composition over the Laptev Sea shelf were attributed to differences in the hydrography, marine chemical conditions, and the sea-ice regime.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We are grateful to the scientists and ship crew for their support during the expedition. We thank Dr. P.B. Hamilton and anonymous reviewers for their valuable comments on an earlier draft of this manuscript. We also thank Prof. Dr. Dieter Piepenburg for detailed comments, which were very helpful in improving the manuscript.
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This work was carried out as part of the German‐Russian cooperation “Laptev Sea System,” funded by German Federal Ministry of Education and Research (Grant BMBF 03G0833) and the Ministry of Education and Science of the Russian Federation. This research was carried out in the framework of the State Assignment of Ministry of Science and High Education, Russia (Theme No. 0149-2019-0007 and “Paleogeographic reconstructions of natural geosystems and forecasting of their changes”).
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YP and IK analyzed phytoplankton samples and prepared the manuscript, FM and EA conducted the fieldwork, AN provided chemical data, JH provided CDT data, and HK organized expedition. All authors provided comments on the manuscript.
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Polyakova, Y.I., Kryukova, I.M., Martynov, F.M. et al. Community structure and spatial distribution of phytoplankton in relation to hydrography in the Laptev Sea and the East Siberian Sea (autumn 2008). Polar Biol 44, 1229–1250 (2021). https://doi.org/10.1007/s00300-021-02873-w
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DOI: https://doi.org/10.1007/s00300-021-02873-w