Physiological responses of coastal and oceanic diatoms to diurnal fluctuations in seawater carbonate chemistry under two CO2 concentrations
Diel and seasonal fluctuations in seawater carbonate chemistry are common in coastal waters, while in the open-ocean carbonate chemistry is much less variable. In both of these environments, ongoing ocean acidification is being superimposed on the natural dynamics of the carbonate buffer system to i...
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Online Access: | https://doi.org/10.5194/bg-13-6247-2016 https://www.biogeosciences.net/13/6247/2016/ |
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ftcopernicus:oai:publications.copernicus.org:bg53616 2023-05-15T17:50:33+02:00 Physiological responses of coastal and oceanic diatoms to diurnal fluctuations in seawater carbonate chemistry under two CO2 concentrations Li, Futian Wu, Yaping Hutchins, David A. Fu, Feixue Gao, Kunshan 2018-09-27 application/pdf https://doi.org/10.5194/bg-13-6247-2016 https://www.biogeosciences.net/13/6247/2016/ eng eng doi:10.5194/bg-13-6247-2016 https://www.biogeosciences.net/13/6247/2016/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-13-6247-2016 2019-12-24T09:51:50Z Diel and seasonal fluctuations in seawater carbonate chemistry are common in coastal waters, while in the open-ocean carbonate chemistry is much less variable. In both of these environments, ongoing ocean acidification is being superimposed on the natural dynamics of the carbonate buffer system to influence the physiology of phytoplankton. Here, we show that a coastal Thalassiosira weissflogii isolate and an oceanic diatom, Thalassiosira oceanica , respond differentially to diurnal fluctuating carbonate chemistry in current and ocean acidification (OA) scenarios. A fluctuating carbonate chemistry regime showed positive or negligible effects on physiological performance of the coastal species. In contrast, the oceanic species was significantly negatively affected. The fluctuating regime reduced photosynthetic oxygen evolution rates and enhanced dark respiration rates of T. oceanica under ambient CO 2 concentration, while in the OA scenario the fluctuating regime depressed its growth rate, chlorophyll a content, and elemental production rates. These contrasting physiological performances of coastal and oceanic diatoms indicate that they differ in the ability to cope with dynamic p CO 2 . We propose that, in addition to the ability to cope with light, nutrient, and predation pressure, the ability to acclimate to dynamic carbonate chemistry may act as one determinant of the spatial distribution of diatom species. Habitat-relevant diurnal changes in seawater carbonate chemistry can interact with OA to differentially affect diatoms in coastal and pelagic waters. Text Ocean acidification Copernicus Publications: E-Journals Biogeosciences 13 22 6247 6259 |
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Copernicus Publications: E-Journals |
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English |
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Diel and seasonal fluctuations in seawater carbonate chemistry are common in coastal waters, while in the open-ocean carbonate chemistry is much less variable. In both of these environments, ongoing ocean acidification is being superimposed on the natural dynamics of the carbonate buffer system to influence the physiology of phytoplankton. Here, we show that a coastal Thalassiosira weissflogii isolate and an oceanic diatom, Thalassiosira oceanica , respond differentially to diurnal fluctuating carbonate chemistry in current and ocean acidification (OA) scenarios. A fluctuating carbonate chemistry regime showed positive or negligible effects on physiological performance of the coastal species. In contrast, the oceanic species was significantly negatively affected. The fluctuating regime reduced photosynthetic oxygen evolution rates and enhanced dark respiration rates of T. oceanica under ambient CO 2 concentration, while in the OA scenario the fluctuating regime depressed its growth rate, chlorophyll a content, and elemental production rates. These contrasting physiological performances of coastal and oceanic diatoms indicate that they differ in the ability to cope with dynamic p CO 2 . We propose that, in addition to the ability to cope with light, nutrient, and predation pressure, the ability to acclimate to dynamic carbonate chemistry may act as one determinant of the spatial distribution of diatom species. Habitat-relevant diurnal changes in seawater carbonate chemistry can interact with OA to differentially affect diatoms in coastal and pelagic waters. |
format |
Text |
author |
Li, Futian Wu, Yaping Hutchins, David A. Fu, Feixue Gao, Kunshan |
spellingShingle |
Li, Futian Wu, Yaping Hutchins, David A. Fu, Feixue Gao, Kunshan Physiological responses of coastal and oceanic diatoms to diurnal fluctuations in seawater carbonate chemistry under two CO2 concentrations |
author_facet |
Li, Futian Wu, Yaping Hutchins, David A. Fu, Feixue Gao, Kunshan |
author_sort |
Li, Futian |
title |
Physiological responses of coastal and oceanic diatoms to diurnal fluctuations in seawater carbonate chemistry under two CO2 concentrations |
title_short |
Physiological responses of coastal and oceanic diatoms to diurnal fluctuations in seawater carbonate chemistry under two CO2 concentrations |
title_full |
Physiological responses of coastal and oceanic diatoms to diurnal fluctuations in seawater carbonate chemistry under two CO2 concentrations |
title_fullStr |
Physiological responses of coastal and oceanic diatoms to diurnal fluctuations in seawater carbonate chemistry under two CO2 concentrations |
title_full_unstemmed |
Physiological responses of coastal and oceanic diatoms to diurnal fluctuations in seawater carbonate chemistry under two CO2 concentrations |
title_sort |
physiological responses of coastal and oceanic diatoms to diurnal fluctuations in seawater carbonate chemistry under two co2 concentrations |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-13-6247-2016 https://www.biogeosciences.net/13/6247/2016/ |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-13-6247-2016 https://www.biogeosciences.net/13/6247/2016/ |
op_doi |
https://doi.org/10.5194/bg-13-6247-2016 |
container_title |
Biogeosciences |
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13 |
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22 |
container_start_page |
6247 |
op_container_end_page |
6259 |
_version_ |
1766157362590121984 |