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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Autores principales:	Y Zheng, M Giordano, K Gao
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2015
Materias:	Biology (General) QH301-705.5 Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/94250c169dec40cf8cf378e84d3240c7
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spelling	oai:doaj.org-article:94250c169dec40cf8cf378e84d3240c72021-11-18T09:20:28ZPhotochemical responses of the diatom Skeletonema costatum grown under elevated CO2 concentrations to short-term changes in pH1864-77821864-779010.3354/ab00619https://doaj.org/article/94250c169dec40cf8cf378e84d3240c72015-01-01T00:00:00Zhttps://www.int-res.com/abstracts/ab/v23/n2/p109-118/https://doaj.org/toc/1864-7782https://doaj.org/toc/1864-7790Variability 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.Y ZhengM GiordanoK GaoInter-ResearcharticleBiology (General)QH301-705.5MicrobiologyQR1-502ENAquatic Biology, Vol 23, Iss 2, Pp 109-118 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biology (General) QH301-705.5 Microbiology QR1-502
spellingShingle	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
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
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://doaj.org/article/94250c169dec40cf8cf378e84d3240c7
work_keys_str_mv	AT yzheng photochemicalresponsesofthediatomskeletonemacostatumgrownunderelevatedco2concentrationstoshorttermchangesinph AT mgiordano photochemicalresponsesofthediatomskeletonemacostatumgrownunderelevatedco2concentrationstoshorttermchangesinph AT kgao photochemicalresponsesofthediatomskeletonemacostatumgrownunderelevatedco2concentrationstoshorttermchangesinph
_version_	1718420915084066816

Photochemical responses of the diatom Skeletonema costatum grown under elevated CO2 concentrations to short-term changes in pH

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