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Sea-ice eukaryotes of the Gulf of Finland, Baltic Sea, and evidence for herbivory on weakly shade-adapted ice algae
Univ Helsinki, Finland ; Finnish Environm Inst, Finland.
Univ Helsinki, Finland.
Univ Helsinki, Finland.
Finnish Environm Inst, Finland.
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2017 (English)In: European Journal of Protistology, ISSN 0932-4739, E-ISSN 1618-0429, Vol. 57, 1-15 p.Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 57, 1-15 p.
Keyword [en]
18S rRNA gene, Accessory pigments, Herbivory, Photoacclimation, Sea ice
National Category
Biological Sciences
Research subject
Ecology, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-64229DOI: 10.1016/j.ejop.2016.10.005ISI: 000395842800001PubMedID: 28011294OAI: oai:DiVA.org:lnu-64229DiVA: diva2:1098087
Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-05-23Bibliographically approved

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CiteExportLink to record
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Citation style
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