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  • 1.
    Majaneva, Markus
    et al.
    University of Helsinki, Finland ; Finnish Environment Institute, Finland.
    Blomster, Jaanika
    University of Helsinki, Finland.
    Mueller, Susann
    University of Helsinki, Finland.
    Autio, Riitta
    Finnish Environment Institute, Finland.
    Majaneva, Sanna
    University of Helsinki, Finland ; Finnish Environment Institute, Finland.
    Hyytiainen, Kirsi
    University of Helsinki, Finland.
    Nagai, Satoshi
    National Research Institute of Fisheries Science, Japan.
    Rintala, Janne-Markus
    University of Helsinki, Finland ; Finnish Environment Institute, Finland.
    Sea-ice eukaryotes of the Gulf of Finland, Baltic Sea, and evidence for herbivory on weakly shade-adapted ice algae2017In: European Journal of Protistology, ISSN 0932-4739, E-ISSN 1618-0429, Vol. 57, p. 1-15Article in journal (Refereed)
    Abstract [en]

    To determine community composition and physiological status of early spring sea-ice organisms, we collected sea-ice, slush and under-ice water samples from the Baltic Sea. We combined light microscopy, HPLC pigment analysis and pyrosequencing, and related the biomass and physiological status of sea-ice algae with the protistan community composition in a new way in the area. In terms of biomass, centric diatoms including a distinct Melosira arctica bloom in the upper intermediate section of the fast ice, dinoflagellates, euglenoids and the cyanobacterium Aphanizomenon sp. predominated in the sea-ice sections and unidentified flagellates in the slush. Based on pigment analyses, the ice-algal communities showed no adjusted photosynthetic pigment pools throughout the sea ice, and the bottom-ice communities were not shade-adapted. The sea ice included more characteristic phototrophic taxa (49%) than did slush (18%) and under-ice water (37%). Cercozoans and ciliates were the richest taxon groups, and the differences among the communities arose mainly from the various phagotrophic protistan taxa inhabiting the communities. The presence of pheophytin a coincided with an elevated ciliate biomass and read abundance in the drift ice and with a high Eurytemora affinis read abundance in the pack ice, indicating that ciliates and Eurytemora affinis were grazing on algae. (C) 2016 Elsevier GmbH. All rights reserved.

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