Variability in the organic ligands released by Emiliania huxleyi under simulated ocean acidification conditions
The variability in the extracellular release of organic ligands by Emiliania huxleyi under four different pCO(2) scenarios (225, 350, 600 and 900 mu atm), was determined. Growth in the batch cultures was promoted by enriching them only with major nutrients and low iron concentrations. No chelating a...
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Online Access: | http://hdl.handle.net/10553/41321 https://doi.org/10.3934/environsci.2017.6.788 |
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ftunivlaspalmas:oai:https://accedacris.ulpgc.es:10553/41321 2023-05-15T17:51:39+02:00 Variability in the organic ligands released by Emiliania huxleyi under simulated ocean acidification conditions Samperio-Ramos, Guillermo Santana-Casiano, J. Magdalena González-Dávila, Melchor Ferreira, Sonia Coimbra, Manuel A. 2017 http://hdl.handle.net/10553/41321 https://doi.org/10.3934/environsci.2017.6.788 spa spa Aims Environmental Science 2372-0344 http://hdl.handle.net/10553/41321 doi:10.3934/environsci.2017.6.788 808 6 788 4 WOS:000432595000004 AIMS Environmental Science [ISSN 2372-0344], v. 4 (6), p. 788-808 2510 Oceanografía Emiliania huxleyi Acidification Extracellular release Phenolic compounds dissolved uronic acids Article 2017 ftunivlaspalmas https://doi.org/10.3934/environsci.2017.6.788 2019-09-08T16:39:59Z The variability in the extracellular release of organic ligands by Emiliania huxleyi under four different pCO(2) scenarios (225, 350, 600 and 900 mu atm), was determined. Growth in the batch cultures was promoted by enriching them only with major nutrients and low iron concentrations. No chelating agents were added to control metal speciation. During the initial (IP), exponential (EP) and steady (SP) phases, extracellular release rates, normalized per cell and day, of dissolved organic carbon (DOCER), phenolic compounds (PhCER), dissolved combined carbohydrates (DCCHOER) and dissolved uronic acids (DUA(ER)) in the exudates were determined. The growth rate decreased in the highest CO2 treatment during the IP (<48 h), but later increased when the exposure was longer (more than 6 days). DOCER did not increase significantly with high pCO2. Although no relationship was observed between DCCHOER and the CO2 conditions, DCCHO was a substantial fraction of the freshly released organic material, accounting for 18% to 37%, in EP, and 14% to 23%, in SP, of the DOC produced. Growth of E. huxleyi induced a strong response in the PhCER and DUAER. While in EP, PhCER were no detected, the DUAER remained almost constant for all CO2 treatments. Increases in the extracellular release of these organic ligands during SP were most pronounced under high pCO2 conditions. Our results imply that, during the final growth stage of E. huxleyi, elevated CO2 conditions will increase its excretion of acid polysaccharides and phenolic compounds, which may affect the biogeochemical behavior of metals in seawater. Article in Journal/Newspaper Ocean acidification Universidad de Las Palmas de Gran Canaria: Acceda Dua ENVELOPE(23.951,23.951,71.017,71.017) AIMS Environmental Science 4 6 788 808 |
institution |
Open Polar |
collection |
Universidad de Las Palmas de Gran Canaria: Acceda |
op_collection_id |
ftunivlaspalmas |
language |
Spanish |
topic |
2510 Oceanografía Emiliania huxleyi Acidification Extracellular release Phenolic compounds dissolved uronic acids |
spellingShingle |
2510 Oceanografía Emiliania huxleyi Acidification Extracellular release Phenolic compounds dissolved uronic acids Samperio-Ramos, Guillermo Santana-Casiano, J. Magdalena González-Dávila, Melchor Ferreira, Sonia Coimbra, Manuel A. Variability in the organic ligands released by Emiliania huxleyi under simulated ocean acidification conditions |
topic_facet |
2510 Oceanografía Emiliania huxleyi Acidification Extracellular release Phenolic compounds dissolved uronic acids |
description |
The variability in the extracellular release of organic ligands by Emiliania huxleyi under four different pCO(2) scenarios (225, 350, 600 and 900 mu atm), was determined. Growth in the batch cultures was promoted by enriching them only with major nutrients and low iron concentrations. No chelating agents were added to control metal speciation. During the initial (IP), exponential (EP) and steady (SP) phases, extracellular release rates, normalized per cell and day, of dissolved organic carbon (DOCER), phenolic compounds (PhCER), dissolved combined carbohydrates (DCCHOER) and dissolved uronic acids (DUA(ER)) in the exudates were determined. The growth rate decreased in the highest CO2 treatment during the IP (<48 h), but later increased when the exposure was longer (more than 6 days). DOCER did not increase significantly with high pCO2. Although no relationship was observed between DCCHOER and the CO2 conditions, DCCHO was a substantial fraction of the freshly released organic material, accounting for 18% to 37%, in EP, and 14% to 23%, in SP, of the DOC produced. Growth of E. huxleyi induced a strong response in the PhCER and DUAER. While in EP, PhCER were no detected, the DUAER remained almost constant for all CO2 treatments. Increases in the extracellular release of these organic ligands during SP were most pronounced under high pCO2 conditions. Our results imply that, during the final growth stage of E. huxleyi, elevated CO2 conditions will increase its excretion of acid polysaccharides and phenolic compounds, which may affect the biogeochemical behavior of metals in seawater. |
format |
Article in Journal/Newspaper |
author |
Samperio-Ramos, Guillermo Santana-Casiano, J. Magdalena González-Dávila, Melchor Ferreira, Sonia Coimbra, Manuel A. |
author_facet |
Samperio-Ramos, Guillermo Santana-Casiano, J. Magdalena González-Dávila, Melchor Ferreira, Sonia Coimbra, Manuel A. |
author_sort |
Samperio-Ramos, Guillermo |
title |
Variability in the organic ligands released by Emiliania huxleyi under simulated ocean acidification conditions |
title_short |
Variability in the organic ligands released by Emiliania huxleyi under simulated ocean acidification conditions |
title_full |
Variability in the organic ligands released by Emiliania huxleyi under simulated ocean acidification conditions |
title_fullStr |
Variability in the organic ligands released by Emiliania huxleyi under simulated ocean acidification conditions |
title_full_unstemmed |
Variability in the organic ligands released by Emiliania huxleyi under simulated ocean acidification conditions |
title_sort |
variability in the organic ligands released by emiliania huxleyi under simulated ocean acidification conditions |
publishDate |
2017 |
url |
http://hdl.handle.net/10553/41321 https://doi.org/10.3934/environsci.2017.6.788 |
long_lat |
ENVELOPE(23.951,23.951,71.017,71.017) |
geographic |
Dua |
geographic_facet |
Dua |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
AIMS Environmental Science [ISSN 2372-0344], v. 4 (6), p. 788-808 |
op_relation |
Aims Environmental Science 2372-0344 http://hdl.handle.net/10553/41321 doi:10.3934/environsci.2017.6.788 808 6 788 4 WOS:000432595000004 |
op_doi |
https://doi.org/10.3934/environsci.2017.6.788 |
container_title |
AIMS Environmental Science |
container_volume |
4 |
container_issue |
6 |
container_start_page |
788 |
op_container_end_page |
808 |
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1766158868038025216 |