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


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Ugalde, SC, Meiners, KM, Davidson, AT, Westwood, KJ and McMinn, A 2013 , 'Photosynthetic carbon allocation of an Antarctic sea ice diatom (Fragilariopsis cylindrus)' , Journal of Experimental Marine Biology and Ecology, vol. 446 , pp. 228-235 , doi: 10.1016/j.jembe.2013.05.022.

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Antarctic sea ice provides an ephemeral but important habitat for algal productivity and is characterised by
extreme physicochemical variations. In this study, we assess the ability of a sea ice diatom (Fragilariopsis
cylindrus) to cope with physicochemical changes through examination of physiological status and allocation
of 14C-incorporated organic carbon into particulate and extracellular fractions, using closed-bottle incubations
over 49 d. Carbon allocationwas found to varywith growth stage and shifts in the physicochemical environment,
in particular the carbonate system. Total extracellular organic carbon was comprised of at least 85% low molecularweight
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.

Item Type: Article
Authors/Creators:Ugalde, SC and Meiners, KM and Davidson, AT and Westwood, KJ and McMinn, A
Journal or Publication Title: Journal of Experimental Marine Biology and Ecology
ISSN: 0022-0981
DOI / ID Number: 10.1016/j.jembe.2013.05.022
Additional Information:

Copyright 2013 Elsevier

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