Particulate trace metal dynamics in response to increased CO 2 and iron availability in a coastal mesocosm experiment
Rising concentrations of atmospheric carbon dioxide are causing ocean acidification and will influence marine processes and trace metal biogeochemistry. In June 2012, in the Raunefjord (Bergen, Norway), we performed a mesocosm experiment, comprised of a fully factorial design of ambient and elevated...
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ftdoajarticles:oai:doaj.org/article:7938bdc34ead4b2db68fc5f58206e7ad 2023-05-15T17:52:05+02:00 Particulate trace metal dynamics in response to increased CO 2 and iron availability in a coastal mesocosm experiment M. R. Lorenzo M. Segovia J. T. Cullen M. T. Maldonado 2020-02-01T00:00:00Z https://doi.org/10.5194/bg-17-757-2020 https://doaj.org/article/7938bdc34ead4b2db68fc5f58206e7ad EN eng Copernicus Publications https://www.biogeosciences.net/17/757/2020/bg-17-757-2020.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-17-757-2020 1726-4170 1726-4189 https://doaj.org/article/7938bdc34ead4b2db68fc5f58206e7ad Biogeosciences, Vol 17, Pp 757-770 (2020) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.5194/bg-17-757-2020 2022-12-31T00:01:53Z Rising concentrations of atmospheric carbon dioxide are causing ocean acidification and will influence marine processes and trace metal biogeochemistry. In June 2012, in the Raunefjord (Bergen, Norway), we performed a mesocosm experiment, comprised of a fully factorial design of ambient and elevated p CO 2 and/or an addition of the siderophore desferrioxamine B (DFB). In addition, the macronutrient concentrations were manipulated to enhance a bloom of the coccolithophore Emiliania huxleyi . We report the changes in particulate trace metal concentrations during this experiment. Our results show that particulate Ti and Fe were dominated by lithogenic material, while particulate Cu, Co, Mn, Zn, Mo and Cd had a strong biogenic component. Furthermore, significant correlations were found between particulate concentrations of Cu, Co, Zn, Cd, Mn, Mo and P in seawater and phytoplankton biomass ( µ gC L −1 ), supporting a significant influence of the bloom in the distribution of these particulate elements. The concentrations of these biogenic metals in the E. huxleyi bloom were ranked as follows: Zn < Cu ≈ Mn < Mo < Co < Cd. Changes in CO 2 affected total particulate concentrations and biogenic metal ratios (Me : P) for some metals, while the addition of DFB only significantly affected the concentrations of some particulate metals (mol L −1 ). Variations in CO 2 had the most clear and significant effect on particulate Fe concentrations, decreasing its concentration under high CO 2 . Indeed, high CO 2 and/or DFB promoted the dissolution of particulate Fe, and the presence of this siderophore helped in maintaining high dissolved Fe. This shift between particulate and dissolved Fe concentrations in the presence of DFB, promoted a massive bloom of E. huxleyi in the treatments with ambient CO 2 . Furthermore, high CO 2 decreased the Me : P ratios of Co, Zn and Mn while increasing the Cu : P ratios. These findings support theoretical predictions that the molar ratios of metal to phosphorous (Me : P ratios) of metals ... Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Bergen Norway Biogeosciences 17 3 757 770 |
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language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 M. R. Lorenzo M. Segovia J. T. Cullen M. T. Maldonado Particulate trace metal dynamics in response to increased CO 2 and iron availability in a coastal mesocosm experiment |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Rising concentrations of atmospheric carbon dioxide are causing ocean acidification and will influence marine processes and trace metal biogeochemistry. In June 2012, in the Raunefjord (Bergen, Norway), we performed a mesocosm experiment, comprised of a fully factorial design of ambient and elevated p CO 2 and/or an addition of the siderophore desferrioxamine B (DFB). In addition, the macronutrient concentrations were manipulated to enhance a bloom of the coccolithophore Emiliania huxleyi . We report the changes in particulate trace metal concentrations during this experiment. Our results show that particulate Ti and Fe were dominated by lithogenic material, while particulate Cu, Co, Mn, Zn, Mo and Cd had a strong biogenic component. Furthermore, significant correlations were found between particulate concentrations of Cu, Co, Zn, Cd, Mn, Mo and P in seawater and phytoplankton biomass ( µ gC L −1 ), supporting a significant influence of the bloom in the distribution of these particulate elements. The concentrations of these biogenic metals in the E. huxleyi bloom were ranked as follows: Zn < Cu ≈ Mn < Mo < Co < Cd. Changes in CO 2 affected total particulate concentrations and biogenic metal ratios (Me : P) for some metals, while the addition of DFB only significantly affected the concentrations of some particulate metals (mol L −1 ). Variations in CO 2 had the most clear and significant effect on particulate Fe concentrations, decreasing its concentration under high CO 2 . Indeed, high CO 2 and/or DFB promoted the dissolution of particulate Fe, and the presence of this siderophore helped in maintaining high dissolved Fe. This shift between particulate and dissolved Fe concentrations in the presence of DFB, promoted a massive bloom of E. huxleyi in the treatments with ambient CO 2 . Furthermore, high CO 2 decreased the Me : P ratios of Co, Zn and Mn while increasing the Cu : P ratios. These findings support theoretical predictions that the molar ratios of metal to phosphorous (Me : P ratios) of metals ... |
format |
Article in Journal/Newspaper |
author |
M. R. Lorenzo M. Segovia J. T. Cullen M. T. Maldonado |
author_facet |
M. R. Lorenzo M. Segovia J. T. Cullen M. T. Maldonado |
author_sort |
M. R. Lorenzo |
title |
Particulate trace metal dynamics in response to increased CO 2 and iron availability in a coastal mesocosm experiment |
title_short |
Particulate trace metal dynamics in response to increased CO 2 and iron availability in a coastal mesocosm experiment |
title_full |
Particulate trace metal dynamics in response to increased CO 2 and iron availability in a coastal mesocosm experiment |
title_fullStr |
Particulate trace metal dynamics in response to increased CO 2 and iron availability in a coastal mesocosm experiment |
title_full_unstemmed |
Particulate trace metal dynamics in response to increased CO 2 and iron availability in a coastal mesocosm experiment |
title_sort |
particulate trace metal dynamics in response to increased co 2 and iron availability in a coastal mesocosm experiment |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/bg-17-757-2020 https://doaj.org/article/7938bdc34ead4b2db68fc5f58206e7ad |
geographic |
Bergen Norway |
geographic_facet |
Bergen Norway |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Biogeosciences, Vol 17, Pp 757-770 (2020) |
op_relation |
https://www.biogeosciences.net/17/757/2020/bg-17-757-2020.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-17-757-2020 1726-4170 1726-4189 https://doaj.org/article/7938bdc34ead4b2db68fc5f58206e7ad |
op_doi |
https://doi.org/10.5194/bg-17-757-2020 |
container_title |
Biogeosciences |
container_volume |
17 |
container_issue |
3 |
container_start_page |
757 |
op_container_end_page |
770 |
_version_ |
1766159420698394624 |