Abstract
The algal, protozoan and metazoan communities within different drift-ice types (newly formed, pancake and rafted ice) and in under-ice water were studied in the Gulf of Bothnia in March 2006. In ice, diatoms together with unidentified flagellates dominated the algal biomass (226 ± 154 μg ww l−1) and rotifers the metazoan and protozoan biomass (32 ± 25 μg ww l−1). The under-ice water communities were dominated by flagellates and ciliates, which resulted in lower biomasses (97 ± 25 and 21 ± 14 μg ww l−1, respectively). The under-ice water and newly formed ice separated from all other samples to their own cluster in hierarchical cluster analysis. The most important discriminating factors, according to discriminant analysis, were chlorophyll-a, phosphate and silicate. The under-ice water/newly formed ice cluster was characterized by high nutrient and low chlorophyll-a values, while the opposite held true for the ice cluster. Increasing trends in chlorophyll-a concentration and biomass were observed with increasing ice thickness. Within the thick ice columns (>40 cm), the highest chlorophyll-a concentrations (6.6–22.2 μg l−1) were in the bottom layers indicating photoacclimation of the sympagic community. The ice algal biomass showed additional peaks in the centric diatom-dominated surface layers coinciding with the highest photosynthetic efficiencies [0.019–0.032 μg C (μg Chl-a −1 h−1) (μE m−2 s−1)−1] and maximum photosynthetic capacities [0.43-1.29 μg C (μg Chl-a −1 h−1)]. Rafting and snow-ice formation, determined from thin sections and stable oxygen isotopic composition, strongly influenced the physical, chemical and biological properties of the ice. Snow-ice formation provided the surface layers with nutrients and possibly habitable space, which seemed to have favored centric diatoms in our study.
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Acknowledgments
This study was made possible by the financial support of Walter and Andrée de Nottbeck Foundation. The Finnish Institute of Marine Research is acknowledged for providing the office and laboratory facilities. We also wish to acknowledge M.Sc. Vilma Rouvinen for her assistance in the preparations before and during the cruise and Dr. Kai Kivi for microscopy work. Dr. Mats Granskog is thanked for employing Jari Uusikivi to carry out the structural analysis of sea-ice samples. We owe our greatest gratitude to Prof. Klaus Jürgens, who on behalf of the Leibniz-Institute für Ostseeforschung Warnemünde (IOW) invited J.-M. Rintala to participate in the maiden voyage of the research vessel Maria S. Merian. The skilled staff, crew and all the scientists onboard are also acknowledged for their assistance, enthusiasm and patience.
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Rintala, JM., Piiparinen, J. & Uusikivi, J. Drift-ice and under-ice water communities in the Gulf of Bothnia (Baltic Sea). Polar Biol 33, 179–191 (2010). https://doi.org/10.1007/s00300-009-0695-1
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DOI: https://doi.org/10.1007/s00300-009-0695-1