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Título: | Dust-induced changes in phytoplankton composition in the Tasman Sea during the last four glacial cycles |
Autor: | Calvo, Eva María CSIC ORCID ; Pelejero, Carles CSIC ORCID ; Logan, Graham A.; de Deckker, Patrick | Fecha de publicación: | jun-2004 | Editor: | American Geophysical Union | Citación: | Paleoceanography 19(2): PA202 (2004) | Resumen: | An 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 | Versión del editor: | https://doi.org/10.1029/2003PA000992 | URI: | http://hdl.handle.net/10261/134862 | DOI: | 10.1029/2003PA000992 | Identificadores: | doi: 10.1029/2003PA000992 issn: 0883-8305 e-issn: 1944-9186 |
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