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| Nedelec, Florence; Fielding, Sophie; Anderson, Thomas R.; Statham, Peter J.. |
| Zooplankton take up trace metals either from the surrounding aquatic medium or from their food. Accumulated trace metal concentrations therefore vary with the bio-availability of the metal in seawater and in the diet, and with the physiology of the organisms (Rainbow, 2002). The Antarctic copepods Rhincalanus gigas, and Calanus sp. are herbivorous, and the amount of Fe assimilated by these grazers is affected by the iron status of their prey. In incubation experiments the Fe:C ratio of copepods was lower than their prey. This may be due to copepods having a lower iron demand than phytoplankton, or to iron not being efficiently assimilated (Schmidt et al., 1999). If iron is not assimilated efficiently and given that respiratory systems may require more iron... |
| Tipo: Text |
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| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/00086/19752/17394.pdf |
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| Pollard, Raymond T.; Salter, Ian; Sanders, Richard J.; Lucas, Mike I.; Moore, C. Mark; Mills, Rachel A.; Statham, Peter J.; Allen, John T.; Baker, Alex R.; Bakker, Dorothee C. E.; Charette, Matthew A.; Fielding, Sophie; Fones, Gary R.; French, Megan; Hickman, Anna E.; Holland, Ross J.; Hughes, J. Alan; Jickells, Timothy D.; Lampitt, Richard S.; Morris, Paul J.; Nedelec, Florence; Nielsdottir, Maria; Planquette, Helene; Popova, Ekaterina E.; Poulton, Alex J.; Read, Jane F.; Seeyave, Sophie; Smith, Tania; Stinchcombe, Mark; Taylor, Sarah; Thomalla, Sandy; Venables, Hugh J.; Williamson, Robert; Zubkov, Mike V.. |
| The addition of iron to high- nutrient, low- chlorophyll regions induces phytoplankton blooms that take up carbon(1-3). Carbon export from the surface layer and, in particular, the ability of the ocean and sediments to sequester carbon for many years remains, however, poorly quantified(3). Here we report data from the CROZEX experiment(4) in the Southern Ocean, which was conducted to test the hypothesis that the observed north - south gradient in phytoplankton concentrations in the vicinity of the Crozet Islands is induced by natural iron fertilization that results in enhanced organic carbon flux to the deep ocean. We report annual particulate carbon fluxes out of the surface layer, at three kilometres below the ocean surface and to the ocean floor. We... |
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| Ano: 2009 |
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| Nedelec, Florence; Statham, Peter J.; Sanders, Richard J.. |
| The aim of this project is to expand on our knowledge of the biogeochemical cycle of iron in different marine environments. Initially this has involved the development of a highly sensitive flow-injection analyser with chemiluminescence detection to measure picomolar concentrations of Fe in seawater. This work will focus on aspects of the inputs of iron, its redox speciation, the iron present in the colloidal fraction and the photoreduction processes in surface waters. |
| Tipo: Text |
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| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00086/19751/17392.pdf |
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