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Sea-ice algal primary production and nitrogen uptake rates off East Antarctica
Citation
Roukaerts, A and Cavagna, A-J and Fripiat, F and Lannuzel, D and Meiners, KM and Dehairs, F, Sea-ice algal primary production and nitrogen uptake rates off East Antarctica, Deep-Sea Research. Part II, 131 pp. 140-149. ISSN 0967-0645 (2016) [Refereed Article]
Copyright Statement
Copyright 2015 Elsevier Ltd
DOI: doi:10.1016/j.dsr2.2015.08.007
Abstract
Antarctic pack ice comprises about 90% of the sea ice in the southern hemisphere and plays an important structuring role in Antarctic marine ecosystems, yet measurements of ice algal primary production and nitrogen uptake rates remain scarce. During the early austral spring of 2012, measurements for primary production rates and uptake of two nitrogen substrates (nitrate and ammonium) were conducted at 5 stations in the East Antarctic pack ice (63–66°S, 115–125°E). Carbon uptake was low (3.52 mg C m−2 d−1) but a trend of increased production was observed towards the end of the voyage suggesting pre-bloom conditions. Significant snow covers reaching, up to 0.8 m, induced strong light limitation. Two different regimes were observed in the ice with primarily nitrate based ‘new’ production (f-ratio: 0.80–0.95) at the bottom of the ice cover, due to nutrient-replete conditions at the ice–water interface, and common for pre-bloom conditions. In the sea-ice interior, POC:PN ratios (20–70) and higher POC:Chl a ratios suggested the presence of large amounts of detrital material trapped in the ice and here ammonium was the prevailing nitrogen substrate. This suggests that most primary production in the sea-ice interior was regenerated and supported by a microbial food web, recycling detritus.
Item Details
Item Type: | Refereed Article |
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Keywords: | primary production, ice algae nitrogen uptake, stable isotope dilution, pack ice, Pacific sector |
Research Division: | Earth Sciences |
Research Group: | Oceanography |
Research Field: | Chemical oceanography |
Objective Division: | Environmental Management |
Objective Group: | Other environmental management |
Objective Field: | Other environmental management not elsewhere classified |
UTAS Author: | Lannuzel, D (Associate Professor Delphine Lannuzel) |
UTAS Author: | Meiners, KM (Dr Klaus Meiners) |
ID Code: | 104046 |
Year Published: | 2016 (online first 2015) |
Web of Science® Times Cited: | 10 |
Deposited By: | Oceans and Cryosphere |
Deposited On: | 2015-11-02 |
Last Modified: | 2017-10-31 |
Downloads: | 0 |
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