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Biogeochemistry and microbial community composition in sea ice and underlying seawater off East Antarctica during early spring

Citation

Becquevort, S and Dumont, I and Tison, JL and Lannuzel, D and Sauvee, ML and Chou, L and Schoemann, V, Biogeochemistry and microbial community composition in sea ice and underlying seawater off East Antarctica during early spring , Polar Biology, 32, (6) pp. 879-895. ISSN 0722-4060 (2009) [Refereed Article]


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Copyright Statement

The original publication is available at http://www.springerlink.com

Official URL: http://www.springerlink.com

DOI: doi:10.1007/s00300-009-0589-2

Abstract

Pack ice, brines and seawaters were sampled in October 2003 in the East Antarctic sector to investigate the structure of the microbial communities (algae, bacteria and protozoa) in relation to the associated physico-chemical conditions (ice structure, temperature, salinity, inorganic nutrients, chlorophyll a and organic matter). Ice cover ranged between 0.3 and 0.8 m, composed of granular and columnar ice. The brine volume fractions sharply increased above -4C in the bottom ice, coinciding with an important increase of algal biomass (up to 3.9 mg C l-1), suggesting a control of the algae growth by the space availability at that period of time. Large accumulation of NH4 ? and PO4 3- was observed in the bottom ice. The high pool of organic matter, especially of transparent exopolymeric particles, likely led to nutrients retention and limitation of the protozoa grazing pressure, inducing therefore an algal accumulation. In contrast, the heterotrophs dominated in the underlying seawaters.

Item Details

Item Type:Refereed Article
Keywords:Sea ice, Brine volume fraction, Nutrients, Organic carbon, Sympagic organisms
Research Division:Environmental Sciences
Research Group:Ecological Applications
Research Field:Ecosystem Function
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate Change Adaptation Measures
Author:Lannuzel, D (Dr Delphine Lannuzel)
ID Code:62628
Year Published:2009
Web of Science® Times Cited:25
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2010-03-13
Last Modified:2015-02-02
Downloads:1 View Download Statistics

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