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Photosynthetic carbon allocation of an Antarctic sea ice diatom (Fragilariopsis cylindrus)


Ugalde, SC and Meiners, K and Davidson, A and Westwood, KJ and McMinn, A, Photosynthetic carbon allocation of an Antarctic sea ice diatom (Fragilariopsis cylindrus), Journal of Experimental Marine Biology and Ecology, 446 pp. 228-235. ISSN 0022-0981 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier B.V.

DOI: doi:10.1016/j.jembe.2013.05.022


Antarctic sea ice provides an ephemeral but important habitat for algal productivity and is characterised by extreme physiochemical variations. In this study, we assess the ability of a sea ice diatom (Fragilariopsis cylindrus) to cope with physiochemical changes through examination of physiological status and allocation of 14C-incorporated organic carbon into particulate and extracellular fractions, using closed-bottle incubations over 49d. Carbon allocation was found to vary with growth stage and shifts in the physicochemical environment, in particular the carbonate system. Total extracellular organic carbon was comprised of at least 85% low molecular weight 14C-colloidal-organic carbon. The relative contribution of 14C-extracellular polymeric substances and 14C-total extracellular organic carbon to 14C-total primary production varied from lag to senescent growth phases, increasing from 0 to 5.7% and 32.9% to 69.5%, respectively. Carbon allocation into 14C-extracellular polymeric substances was correlated with a decline in CO2 availability and increased pH. Overall, the results demonstrate that carbon exudation may play an important role in adaptive algal physiology by buffering cells against biogeochemical shifts within brine channels, induced through photosynthetic activity. Β© 2013.

Item Details

Item Type:Refereed Article
Keywords:Antarctic sea ice algae
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Biodiversity in Antarctic and Southern Ocean environments
UTAS Author:Ugalde, SC (Ms Sarah Ugalde)
UTAS Author:Meiners, K (Dr Klaus Meiners)
UTAS Author:Davidson, A (Dr Andrew Davidson)
UTAS Author:Westwood, KJ (Dr Karen Westwood)
UTAS Author:McMinn, A (Professor Andrew McMinn)
ID Code:86104
Year Published:2013
Funding Support:Australian Research Council (DP0880212)
Web of Science® Times Cited:3
Deposited By:IMAS Research and Education Centre
Deposited On:2013-08-23
Last Modified:2014-06-05

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