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Polar Biology

, Volume 26, Issue 11, pp 707–719 | Cite as

The biology and chemistry of land fast ice in the White Sea, Russia—A comparison of winter and spring conditions

  • Andreas Krell
  • Caroline Ummenhofer
  • Gerhard Kattner
  • Andrei Naumov
  • Dylan Evans
  • Gerhard S. Dieckmann
  • David N. Thomas
Original Paper

Abstract

Various abiotic and biotic parameters, including phytoplankton distribution, were studied to investigate seasonal changes within the fast-ice cover in Chupa Inlet, a freshwater-influenced Arctic-like fjord in Kandalaksha Bay (White Sea). Sea ice and under-ice water were collected along transects in the inlet in February and April 2002. Ice-texture analysis, salinity and δ18O values indicated that the complete ice sheet had transformed within 2 months. This resulted from an upward growth of snow ice and subsequent melting at the underside of the ice, which makes a comparison between the two sampling periods difficult in terms of defining temporal developments within the ice. Nutrients, DOC and DON concentrations in the under-ice water were typical for Russian Arctic rivers. Concentrations of nitrate, silicate and DOC in the ice were lower, which is attributed to a loss as the ice forms. The concentrations were also modified by biological activity. In February, there was a strong correspondence between the distribution of biological parameters, including particulate and dissolved organic carbon and nitrogen (POC and PON, DOC and DON) and inorganic nutrients (nitrate, nitrite, phosphate and silicate), which was not the case in April. The correlation between both DOC and DON with ammonium indicates heterotrophic activity within the winter ice collected in February. Sea-ice organisms were distributed throughout the ice, and several assemblages were found in surface layers of the ice. In April, a more "typical" distribution of biomass in the ice was measured, with low values in the upper part and high algal concentrations in the lower sections of the ice, characteristic of a spring ice-algal bloom. In contrast to the February sampling, there was evidence that the ice-algal assemblage in April was nitrogen-limited, with total inorganic nitrogen concentrations being <1 µm and a mean inorganic nitrogen to phosphorus ratio of 2.8. The ice assemblages were dominated by diatoms (in particular, Nitzschia spp.). There were temporal shifts in the assemblage composition: in February, diatoms accounted for 40% and in April for >98% of all organisms counted.

Keywords

Dissolve Organic Nitrogen Dissolve Organic Matter Navicula Open Inlet Bulk Salinity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors are grateful to the staff of Kartesh Biological Station for their co-operation and assistance throughout the two field trips. Andreas Mackensen is thanked for his assistance in the oxygen isotope analyses. We thank Erika Allhusen and Marthi Wolff for excellent technical support and Zuzana Krell-Laluhová, Matthias Steffens and Oleg Fajans for their help during the fieldwork. This work was supported by EU funding through the Copernicus Programme, research project WOMP (ICA2-CT-2000-1003). D.N.T. is also grateful for the support of the Hanse Institute of Advanced Study and the Royal Society (Joint Project).

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Andreas Krell
    • 1
    • 2
  • Caroline Ummenhofer
    • 2
  • Gerhard Kattner
    • 1
  • Andrei Naumov
    • 3
  • Dylan Evans
    • 2
  • Gerhard S. Dieckmann
    • 1
  • David N. Thomas
    • 2
  1. 1.Alfred Wegener Institute for Marine and Polar ResearchBremerhavenGermany
  2. 2.School of Ocean ScienceUniversity of Wales-BangorMenai BridgeUK
  3. 3.Zoological InstituteAcademy of SciencesSt. Petersburg Russia

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