Light dependence of selenium uptake by phytoplankton and implications for predicting selenium incorporation into food webs

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dc.contributor.author Baines, Stephen en_US
dc.contributor.author Fisher, Nicholas en_US
dc.contributor.author Doblin, Martina en_US
dc.contributor.author Cutter, Gregory en_US
dc.contributor.author Cutter, Lynda en_US
dc.contributor.author Cole, Brian en_US
dc.contributor.editor en_US
dc.date.accessioned 2010-05-28T09:43:40Z
dc.date.available 2010-05-28T09:43:40Z
dc.date.issued 2004 en_US
dc.identifier 2006007047 en_US
dc.identifier.citation Baines Stephen et al. 2004, 'Light dependence of selenium uptake by phytoplankton and implications for predicting selenium incorporation into food webs', American Society of Limnology and Oceanography, Inc., vol. 49, no. 2, pp. 566-578. en_US
dc.identifier.issn 0024-3590 en_US
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/8507
dc.description.abstract The potentially toxic element selenium is first concentrated from solution to a large but highly variable degree by algae and bacteria before being passed on to consumers. The large loads of abiotic and detrital suspended particles often present in rivers and estuaries may obscure spatial and temporal patterns in Se concentrations at the base of the food web. We used radiotracers to estimate uptake of both selenite (Se(IV)) and C by intact plankton communities at two sites in the Sacramento/San Joaquin River Delta. Our goals were to determine (1) whether C and Se(IV) uptake were coupled, (2) the role of bacteria in Se(IV) uptake, and (3) the Se: C uptake ratio of newly produced organic material. Se(IV) uptake, like C uptake, was strongly related to irradiance. The shapes of both relationships were very similar except that at least 42-56% of Se(IV) uptake occurred in the dark, whereas C uptake in the dark was negligible. Of this dark Se(IV) uptake, 34-67% occurred in the 0.2-1.0-mum size fraction, indicating significant uptake by bacteria. In addition to dark uptake, total Se(IV) uptake consisted of a light-driven component that was in fixed proportion to C uptake. Our estimates of daily areal Se(IV): C uptake ratios agreed very well with particulate Se: C measured at a site dominated by phytoplankton biomass. Estimates of bacterial Se: C were 2.4-13 times higher than for the phytoplankton, suggesting that bacteriovores may be exposed to higher dietary Se concentrations than herbivores. en_US
dc.language en_US
dc.publisher American Society of Limnology and Oceanography, Inc. en_US
dc.relation.isbasedon en_US
dc.relation.isbasedon http://dx.doi.org/10.4319/lo.2004.49.2.0566 en_US
dc.title Light dependence of selenium uptake by phytoplankton and implications for predicting selenium incorporation into food webs en_US
dc.parent Limnology and Oceanography en_US
dc.journal.volume 49 en_US
dc.journal.number 2 en_US
dc.publocation Waco, USA en_US
dc.identifier.startpage 566 en_US
dc.identifier.endpage 578 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 040501 en_US
dc.personcode 0000027816 en_US
dc.personcode 0000030772 en_US
dc.personcode 996445 en_US
dc.personcode 0000027818 en_US
dc.personcode 0000027817 en_US
dc.personcode 0000046205 en_US
dc.percentage 100 en_US
dc.classification.name Biological Oceanography en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom 3.287 en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords FRESH-WATER PHYTOPLANKTON; MARINE-PHYTOPLANKTON; PHOTOSYNTHESIS; ASSIMILATION; METABOLISM; BACTERIAL; BIOACCUMULATION; BIOAVAILABILITY; AVAILABILITY; COMMUNITIES en_US


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