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Effect of melting Antarctic sea ice on the fate of microbial communities studied in microcosms
Citation
Lannuzel, D and Schoemann, V and Dumont, I and Content, M and de Jong, J and Tison, JL and Delille, B and Becquevort, S, Effect of melting Antarctic sea ice on the fate of microbial communities studied in microcosms, Polar Biology, 36, (10) pp. 1438-1497. ISSN 0722-4060 (2013) [Refereed Article]
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Copyright Statement
Licensed under the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited
DOI: doi:10.1007/s00300-013-1368-7
Abstract
Although algal growth in the iron-deficient
Southern Ocean surface waters is generally low, there is
considerable evidence that winter sea ice contains high
amounts of iron and organicmatter leading to ice-edge blooms
during austral spring. We used field observations and shipbased
microcosm experiments to study the effect of the
seeding by sea ice microorganisms, and the fertilization by
organic matter and iron on the planktonic community at the
onset of spring/summer in the Weddell Sea. Pack ice was a
major source of autotrophs resulting in a ninefold to 27-fold
increase in the sea ice-fertilized seawater microcosm compared
to the ice-free seawater microcosm. However, heterotrophs
were released in lower numbers (only a 2- to 6-fold
increase). Pack ice was also an important source of dissolved
organic matter for the planktonic community. Small algae
(\10 lm) and bacteria released frommelting sea icewere able
to thrive in seawater. Field observations show that the supply
of iron from melting sea ice had occurred well before our
arrival onsite, and the supply of iron to the microcosms was
therefore low. We finally ran a ‘‘sequential melting’’ experiment
to monitor the release of ice constituents in seawater.
Brine drainage occurred first and was associated with the
release of dissolved elements (salts, dissolved organic carbon
and dissolved iron). Particulate organic carbon and particulate
iron were released with low-salinity waters at a later stage.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | sea ice; iron; microbial communities, Antarctica |
| Research Division: | Earth Sciences |
| Research Group: | Oceanography |
| Research Field: | Chemical Oceanography |
| Objective Division: | Environment |
| Objective Group: | Other Environment |
| Objective Field: | Environment not elsewhere classified |
| UTAS Author: | Lannuzel, D (Associate Professor Delphine Lannuzel) |
| ID Code: | 86451 |
| Year Published: | 2013 |
| Funding Support: | Australian Research Council (DE120100030) |
| Web of Science® Times Cited: | 16 |
| Deposited By: | IMAS Research and Education Centre |
| Deposited On: | 2013-09-17 |
| Last Modified: | 2015-02-02 |
| Downloads: | 477 View Download Statistics |
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