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dc.contributor.authorCalvo, Eva María-
dc.contributor.authorPelejero, Carles-
dc.contributor.authorLogan, Graham A.-
dc.contributor.authorde Deckker, Patrick-
dc.identifierdoi: 10.1029/2003PA000992-
dc.identifierissn: 0883-8305-
dc.identifiere-issn: 1944-9186-
dc.identifier.citationPaleoceanography 19(2): PA202 (2004)-
dc.description.abstractAn increase in iron supply associated with enhanced dust inputs could be responsible for higher marine phytoplankton production leading to the typically lower glacial atmospheric CO2 concentrations, as suggested by the >iron hypothesis>. The enhanced dust supply may also have provided the oceans with significant amounts of silica, which would have favored the growth of diatoms over coccolithophores, as suggested by the >silica hypothesis>. Here we present new data on molecular biomarkers in a sediment core from the midlatitudes of the Southern Hemisphere, which reveal dust-induced changes in the relative contribution of the phytoplankton to total productivity. Our results illustrate a shift in the relative abundance of siliceous over calcareous organisms during glacial times, when terrestrial aeolian input was enhanced. Although we did not detect a significant glacial decrease in coccolithophorid productivity, the decrease in the CaCO3/Corg rain ratio could have still contributed to some extent in lowering atmospheric CO2 levels-
dc.description.sponsorshipE.C. and C.P. acknowledge funding from Secretaria de Estado de Educación y Universidades and ARC. G.A.L. published with permission of the CEO of Geoscience Australia. An ARC grant to P.D.D. helped finance the stable isotope analyse-
dc.description.uri10 pages, 6 figures-
dc.publisherAmerican Geophysical Union-
dc.titleDust-induced changes in phytoplankton composition in the Tasman Sea during the last four glacial cycles-
dc.description.versionPeer Reviewed-
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