Journal
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
Volume 56, Issue 17, Pages 1201-1212Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr2.2008.10.016
Keywords
Arctic; Primary production; Sea-ice algae; Phytoplankton; Nutrients
Categories
Funding
- National Science Foundation [0125464]
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Sea-ice and water samples were collected at 14 stations on the shelves and slope regions of the Chukchi and Beaufort Seas during the spring 2002 expedition as part of the Shelf-Basin Interaction Studies. Algal pigment content, particulate organic carbon and nitrogen, and primary productivity were estimated for both habitats based on ice cores, brine collection and water samples from 5-m depth. The pigment content (0.2-304.3 mg pigments m(-2)) and primary productivity (0.1-23.0 Mg C m(-3) h(-1)) of the sea-ice algae significantly exceeded water-column parameters (0.2 and 1.0 mg pigments m(-3); < 0.1-0.4 mg C m(-3) h(-1)), making sea ice the habitat with the highest food availability for herbivores in early spring in the Chukchi and Beaufort Seas. Stable isotope signatures for ice and water samples did not differ significantly for delta N-15, but for delta C-13 (ice: -25.1 parts per thousand to -14.2 parts per thousand: water: -26.1 parts per thousand to -22.4 parts per thousand). The analysis of nutrient concentrations and the pulse-amplitude-modulated fluorescence signal of ice algae and phytoplankton indicate that nutrients were the prime limiting factor for sea-ice algal productivity. The estimated spring primary production of about 1-2 g C m(-2) of sea-ice algae on the shelves requires the use of substantial nutrient reservoirs from the water column. (c) 2008 Published by Elsevier Ltd.
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