Author(s): Johanna Ikavalko; Iris Werner; Tuomo Roine; Kimmo Karell; Mats Granskog; Jens Ehn
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Abstract: Samples of drift and fast ice were obtained for the study of abiotic ice properties and biota in the Bothnian Bay during Feb 17 – 21,2002 and Apr 8 - 12,2002. Ice structure, δ180 composition, nutrients (tot-N, tot-P), chl-a concentration, protists and metazoans of drift and landfast ice were analysed. A signifcant portion of ice was of meteoric origin. Nutrient concentrations, in particular tot-P, were always very low within ice. Chl-a concentrations doubled from February to April, and the concentration maxima were always in the bottom ice layers in April. The algal flora was significantly more diverse in drift than in landfast ice, and was dominated by chlorophytes and diatoms. Of the few metazoan taxa present within the ice, rotifers (Keratella spp. ) were the most common with a maximum abundance 32 individuals l-1 melted ice.
Year: 2004