Werner, Iris; Ikävalko, Johanna; Schünemann, Henrike (2007): Photosynthetically active radiation and microalgae and protist occurrence at ice stations of POLARSTERN cruise ARK-XIX/1 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.855218, Supplement to: Werner, I et al. (2007): Sea-ice algae in Arctic pack ice during late winter. Polar Biology, 30(11), 1493-1504, https://doi.org/10.1007/s00300-007-0310-2
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Abstract:
Pack ice around Svalbard was sampled during the expedition ARK XIX/1 of RV "Polarstern" (March-April 2003) in order to determine environmental conditions, species composition and abundances of sea-ice algae and heterotrophic protists during late winter. As compared to other seasons, species diversity of algae (total 40 taxa) was not low, but abundances (5,000-448,000 cells/l) were lower by one to two orders of magnitude. Layers of high algal abundances were observed both at the bottom and in the ice interior. Inorganic nutrient concentrations (NO2, NO3, PO4, Si(OH)4) within the ice were mostly higher than during other seasons, and enriched compared to seawater by enrichment indices of 1.6-24.6 (corrected for losses through the desalination process). Thus, the survival of algae in Arctic pack ice was not limited by nutrients at the beginning of the productive season. Based on less-detailed physical data, light was considered as the most probable factor controlling the onset of the spring ice-algal bloom in the lower part of the ice, while low temperatures and salinities inhibit algal growth in the upper part of the ice at the end of the winter. Incorporation of ice algae probably took place during the entire freezing period. Possible overwintering strategies during the dark period, such as facultative heterotrophy, energy reserves, and resting spores are discussed.
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Median Latitude: 78.905080 * Median Longitude: 16.849420 * South-bound Latitude: 76.294900 * West-bound Longitude: 9.569400 * North-bound Latitude: 81.898400 * East-bound Longitude: 23.365800
Date/Time Start: 2003-03-12T08:20:00 * Date/Time End: 2003-04-17T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Werner, I; Ikävalko, J; Schünemann, H (2007): (Table 2) Microalgal taxa and heterotrophic protists found in Arctic pack ice at ice stations during POLARSTERN cruise ARK-XIX/1 to the western Barents Sea and north of Svalbard. https://doi.org/10.1594/PANGAEA.855217
- Werner, I; Ikävalko, J; Schünemann, H (2007): (Table 1) Photosynthetically active radiation at ice stations during POLARSTERN cruise ARK-XIX/1 to the western Barents Sea and north of Svalbard. https://doi.org/10.1594/PANGAEA.855216