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Development of ice biota in a temperate sea area (Gulf of Bothnia)

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Abstract

A study of sea ice biota was carried out in the Gulf of Bothnia (northern Baltic Sea) during the winter of 1989–1990. Samples (ice cores) were taken at a coastal station at regular time intervals during the ice season. Chlorophyll a concentration, algal species distribution, bacterial numbers, and primary and bacterial production were measured. Colonization of the ice began in January when daylight was low. As the available light increased, the algae started to grow exponentially. The vertical chlorophyll a distribution changed and algal species composition and biomass changed during the season. During the initial and middle phase of colonization, ice-specific diatoms, Nitzschia frigida and Navicula pelagica, dominated the algal biomass. Nutrients (PO4 3− and NO3j) were found to be depleted during the time of algal exponential growth. The maximum algal biomass exceeded 800 μg C 1−1. The primary production supplied food for heterotrophic organisms. The presence of heterotrophic organisms of different trophic levels (bacteria, flagellates, ciliates and rotifers) indicated an active microbial food web.

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Authors and Affiliations

  1. Department of Microbiology, University of Umeå, S-901 87, Umeå, Sweden

    Bo Norrman & Agneta Andersson

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  1. Bo Norrman
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  2. Agneta Andersson
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Norrman, B., Andersson, A. Development of ice biota in a temperate sea area (Gulf of Bothnia). Polar Biol 14, 531–537 (1994). https://doi.org/10.1007/BF00238222

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  • DOI: https://doi.org/10.1007/BF00238222

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