Floating Ice-Algal Aggregates below Melting Arctic Sea Ice.

Assmy, Philipp, Ehn, Jens K., Fernández-Méndez, Mar, Hop, Haakon, Katlein, Christian, Sundfjord, Arild, Bluhm, Katrin, Daase, Malin, Engel, Anja , Fransson, Agneta, Granskog, Mats A., Hudson, Stephen R., Kristiansen, Svein, Nicolaus, Marcel, Peeken, Ilka, Renner, Angelika H. H., Spreen, Gunnar, Tatarek, Agnieszka and Wiktor, Jozef (2013) Floating Ice-Algal Aggregates below Melting Arctic Sea Ice. Open Access PLoS ONE, 8 (10). e76599. DOI 10.1371/journal.pone.0076599.

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During two consecutive cruises to the Eastern Central Arctic in late summer 2012, we observed floating algal aggregates in the melt-water layer below and between melting ice floes of first-year pack ice. The macroscopic (1-15 cm in diameter) aggregates had a mucous consistency and were dominated by typical ice-associated pennate diatoms embedded within the mucous matrix. Aggregates maintained buoyancy and accumulated just above a strong pycnocline that separated meltwater and seawater layers. We were able, for the first time, to obtain quantitative abundance and biomass estimates of these aggregates. Although their biomass and production on a square metre basis was small compared to ice-algal blooms, the floating ice-algal aggregates supported high levels of biological activity on the scale of the individual aggregate. In addition they constituted a food source for the ice-associated fauna as revealed by pigments indicative of zooplankton grazing, high abundance of naked ciliates, and ice amphipods associated with them. During the Arctic melt season, these floating aggregates likely play an important ecological role in an otherwise impoverished near-surface sea ice environment. Our findings provide important observations and measurements of a unique aggregate-based habitat during the 2012 record sea ice minimum year

Document Type: Article
Additional Information: WOS:000326019400075
Keywords: Sea water; Diatoms; Water columns; Sediment; Ice core; Sea ice; Ponds; RV Polarstern, RV Lance
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
Open Access Journal?: Yes
Publisher: Public Library of Science
Projects: Transdrift
Date Deposited: 18 Oct 2013 05:55
Last Modified: 23 Sep 2019 22:59
URI: https://oceanrep.geomar.de/id/eprint/22157

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