Bioavailability of organically bound Fe to model phytoplankton of the Southern Ocean

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dc.contributor.author Hassler, CS
dc.contributor.author Schoemann, V
dc.date.accessioned 2010-05-28T09:43:44Z
dc.date.issued 2009-01
dc.identifier.citation Biogeosciences, 2009, 6 (10), pp. 2281 - 2296
dc.identifier.issn 1726-4170
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/8518
dc.description.abstract Iron (Fe) is known to be mostly bound to organic ligands and to limit primary productivity in the Southern Ocean. It is thus important to investigate the bioavailability of organically bound Fe. In this study, we used four phytoplankton species of the Southern Ocean (Phaeocystis sp., Chaetoceros sp., Fragilariopsis kerguelensis and Thalassiosira antarctica Comber) to measure the influence of various organic ligands on Fe solubility and bioavailability. Short-term uptake Fe:C ratios were inversely related to the surface area to volume ratios of the phytoplankton. The ratio of extracellular to intracellular Fe is used to discuss the relative importance of diffusive supply and uptake to control Fe bioavailability. The effect of excess organic ligands on Fe bioavailability cannot be solely explained by their effect on Fe solubility. For most strains studied, the bioavailability of Fe can be enhanced relative to inorganic Fe in the presence of porphyrin, catecholate siderophore and saccharides whereas it was decreased in presence of hydroxamate siderophore and organic amine. For Thalassiosira, iron bioavailability was not affected by the presence of porphyrin, catecholate siderophore and saccharides. The enhancement of Fe bioavailability in presence of saccharides is presented as the result from both the formation of bioavailable (or chemically labile) organic form of Fe and the stabilisation of Fe within the dissolved phase. Given the ubiquitous presence of saccharides in the ocean, these compounds might represent an important factor to control the basal level of soluble and bioavailable Fe. Results show that the use of model phytoplankton is promising to improve mechanistic understanding of Fe bioavailability and primary productivity in HNLC regions of the ocean.
dc.publisher Copernicus GmbH
dc.relation.isbasedon 10.5194/bg-6-2281-2009
dc.title Bioavailability of organically bound Fe to model phytoplankton of the Southern Ocean
dc.type Journal Article
dc.parent Biogeosciences
dc.journal.volume 10
dc.journal.volume 6
dc.journal.number 10 en_US
dc.publocation Germany en_US
dc.identifier.startpage 2281 en_US
dc.identifier.endpage 2296 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.personcode 107808
dc.percentage 100 en_US
dc.classification.name Oceanography en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords en_US
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Open Access
utslib.copyright.date 2015-04-15 12:23:47.074767+10


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