Photochemical responses of the diatom Skeletonema costatum grown under elevated CO2 concentrations to short-term changes in pH
Variability in pH is a common occurrence in many aquatic environments, due to physical, chemical and biological processes. In coastal waters, lagoons, estuaries and inland waters, pH can change very rapidly (within seconds or hours) in addition to daily and seasonal changes. At the same time, progre...
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ftdoajarticles:oai:doaj.org/article:94250c169dec40cf8cf378e84d3240c7 2023-05-15T17:50:51+02:00 Photochemical responses of the diatom Skeletonema costatum grown under elevated CO2 concentrations to short-term changes in pH Y Zheng M Giordano K Gao 2015-01-01T00:00:00Z https://doi.org/10.3354/ab00619 https://doaj.org/article/94250c169dec40cf8cf378e84d3240c7 EN eng Inter-Research https://www.int-res.com/abstracts/ab/v23/n2/p109-118/ https://doaj.org/toc/1864-7782 https://doaj.org/toc/1864-7790 1864-7782 1864-7790 doi:10.3354/ab00619 https://doaj.org/article/94250c169dec40cf8cf378e84d3240c7 Aquatic Biology, Vol 23, Iss 2, Pp 109-118 (2015) Biology (General) QH301-705.5 Microbiology QR1-502 article 2015 ftdoajarticles https://doi.org/10.3354/ab00619 2022-12-31T06:46:56Z Variability in pH is a common occurrence in many aquatic environments, due to physical, chemical and biological processes. In coastal waters, lagoons, estuaries and inland waters, pH can change very rapidly (within seconds or hours) in addition to daily and seasonal changes. At the same time, progressive ocean acidification caused by anthropogenic CO2 emissions is superimposed on these spatial and temporal pH changes. Photosynthetic organisms are therefore unavoidably subject to significant pH variations at the cell surface. Whether this will affect their response to long-term ocean acidification is still unknown, nor is it known whether the short-term sensitivity to pH change is affected by the pCO2 to which the cells are acclimated. We posed the latter open question as our experimental hypothesis: Does acclimation to seawater acidification affect the response of phytoplankton to acute pH variations? The diatom Skeletonema costatum, commonly found in coastal and estuarine waters where short-term acute changes in pH frequently occur, was selected to test the hypothesis. Diatoms were grown at both 390 (pH 8.2, low CO2; LC) and 1000 (pH 7.9, high CO2; HC) µatm CO2 for at least 20 generations, and photosynthetic responses to short-term and acute changes in pH (between 8.2 and 7.6) were investigated. The effective quantum yield of LC-grown cells decreased by ca. 70% only when exposed to pH 7.6; this was not observed when exposed to pH 7.9 or 8.2. HC-grown cells did not show significant responses in any pH treatment. Non-photochemical quenching showed opposite trends. In general, our results indicate that while LC-grown cells are rather sensitive to acidification, HC-grown cells are relatively unresponsive in terms of photochemical performance. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Aquatic Biology 23 2 109 118 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Biology (General) QH301-705.5 Microbiology QR1-502 |
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Biology (General) QH301-705.5 Microbiology QR1-502 Y Zheng M Giordano K Gao Photochemical responses of the diatom Skeletonema costatum grown under elevated CO2 concentrations to short-term changes in pH |
topic_facet |
Biology (General) QH301-705.5 Microbiology QR1-502 |
description |
Variability in pH is a common occurrence in many aquatic environments, due to physical, chemical and biological processes. In coastal waters, lagoons, estuaries and inland waters, pH can change very rapidly (within seconds or hours) in addition to daily and seasonal changes. At the same time, progressive ocean acidification caused by anthropogenic CO2 emissions is superimposed on these spatial and temporal pH changes. Photosynthetic organisms are therefore unavoidably subject to significant pH variations at the cell surface. Whether this will affect their response to long-term ocean acidification is still unknown, nor is it known whether the short-term sensitivity to pH change is affected by the pCO2 to which the cells are acclimated. We posed the latter open question as our experimental hypothesis: Does acclimation to seawater acidification affect the response of phytoplankton to acute pH variations? The diatom Skeletonema costatum, commonly found in coastal and estuarine waters where short-term acute changes in pH frequently occur, was selected to test the hypothesis. Diatoms were grown at both 390 (pH 8.2, low CO2; LC) and 1000 (pH 7.9, high CO2; HC) µatm CO2 for at least 20 generations, and photosynthetic responses to short-term and acute changes in pH (between 8.2 and 7.6) were investigated. The effective quantum yield of LC-grown cells decreased by ca. 70% only when exposed to pH 7.6; this was not observed when exposed to pH 7.9 or 8.2. HC-grown cells did not show significant responses in any pH treatment. Non-photochemical quenching showed opposite trends. In general, our results indicate that while LC-grown cells are rather sensitive to acidification, HC-grown cells are relatively unresponsive in terms of photochemical performance. |
format |
Article in Journal/Newspaper |
author |
Y Zheng M Giordano K Gao |
author_facet |
Y Zheng M Giordano K Gao |
author_sort |
Y Zheng |
title |
Photochemical responses of the diatom Skeletonema costatum grown under elevated CO2 concentrations to short-term changes in pH |
title_short |
Photochemical responses of the diatom Skeletonema costatum grown under elevated CO2 concentrations to short-term changes in pH |
title_full |
Photochemical responses of the diatom Skeletonema costatum grown under elevated CO2 concentrations to short-term changes in pH |
title_fullStr |
Photochemical responses of the diatom Skeletonema costatum grown under elevated CO2 concentrations to short-term changes in pH |
title_full_unstemmed |
Photochemical responses of the diatom Skeletonema costatum grown under elevated CO2 concentrations to short-term changes in pH |
title_sort |
photochemical responses of the diatom skeletonema costatum grown under elevated co2 concentrations to short-term changes in ph |
publisher |
Inter-Research |
publishDate |
2015 |
url |
https://doi.org/10.3354/ab00619 https://doaj.org/article/94250c169dec40cf8cf378e84d3240c7 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Aquatic Biology, Vol 23, Iss 2, Pp 109-118 (2015) |
op_relation |
https://www.int-res.com/abstracts/ab/v23/n2/p109-118/ https://doaj.org/toc/1864-7782 https://doaj.org/toc/1864-7790 1864-7782 1864-7790 doi:10.3354/ab00619 https://doaj.org/article/94250c169dec40cf8cf378e84d3240c7 |
op_doi |
https://doi.org/10.3354/ab00619 |
container_title |
Aquatic Biology |
container_volume |
23 |
container_issue |
2 |
container_start_page |
109 |
op_container_end_page |
118 |
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1766157759778127872 |