An evaluation of iron bioavailability and speciation in western Lake Superior with the use of combined physical, chemical, and biological assessment

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Show simple item record Hassler, CS Havens, SM Bullerjahn, GS McKay, RM Twiss, MR 2010-05-28T09:43:41Z 2009-01
dc.identifier.citation Limnology and Oceanography, 2009, 54 (3), pp. 987 - 1001
dc.identifier.issn 0024-3590
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract An iron-dependent cyanobacterial bioreporter (Synechococcus strain KAS101) was used in unison with sizefractionated iron content (.0.45, ,0.45, ,0.02 mm), and chemical characterization of iron complexation (C18 resin column) to elucidate the bioavailable forms of iron present in Lake Superior during periods of inverse thermal stratification (May) and strong thermal stratification (September) of the water column. The results provide evidence of organic complexation of iron in Lake Superior waters. Iron in most sampled water was complexed by organic compounds that behaved like fulvic acids, whereas some samples showed evidence for the presence of siderophore-like compounds. The presence of dissolved organic matter suppressed the cellular luminescence of the bioreporter, indicating an increased iron bioavailability. This effect could result either from the presence of siderophores forming iron complexes that are bioavailable to the bioreporter, or from more indirect effects because of the presence of other organic compounds, such as fulvic acids or polysaccharides. Model ligand additions, iron bioaccumulation, and photo-oxidation of dissolved organic matter were used to assess the bioavailability of organically complexed iron to the bioreporter. A significant fraction of the iron (40 100%) was bioavailable to the bioreporter. Iron bioavailability was high enough for the bioreporter not to be iron limited in the water collected from Lake Superior. This measure of bioavailability to picocyanobacteria is relevant because picoplankton accounted for the majority of chlorophyll a in Lake Superior during this study.
dc.publisher Amer Soc Limnology and Oceanography
dc.relation.isbasedon 10.4319/lo.2009.54.3.0987
dc.title An evaluation of iron bioavailability and speciation in western Lake Superior with the use of combined physical, chemical, and biological assessment
dc.type Journal Article
dc.parent Limnology and Oceanography
dc.journal.volume 3
dc.journal.volume 54
dc.journal.number 3 en_US
dc.publocation Waco, USA en_US
dc.identifier.startpage 987 en_US
dc.identifier.endpage 1001 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.personcode 107808
dc.percentage 100 en_US Biological Oceanography en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords NA 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 2015-04-15 12:23:47.074767+10
utslib.collection.history General (ID: 2)

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