Image_1_Lower Salinity Leads to Improved Physiological Performance in the Coccolithophorid Emiliania huxleyi, Which Partly Ameliorates the Effects of Ocean Acidification.pdf
While seawater acidification induced by elevated CO 2 is known to impact coccolithophores, the effects in combination with decreased salinity caused by sea ice melting and/or hydrological events have not been documented. Here we show the combined effects of seawater acidification and reduced salinit...
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ftfrontimediafig:oai:figshare.com:article/12871058 2023-05-15T17:51:00+02:00 Image_1_Lower Salinity Leads to Improved Physiological Performance in the Coccolithophorid Emiliania huxleyi, Which Partly Ameliorates the Effects of Ocean Acidification.pdf Jiekai Xu Jiazhen Sun John Beardall Kunshan Gao 2020-08-27T04:50:37Z https://doi.org/10.3389/fmars.2020.00704.s001 https://figshare.com/articles/figure/Image_1_Lower_Salinity_Leads_to_Improved_Physiological_Performance_in_the_Coccolithophorid_Emiliania_huxleyi_Which_Partly_Ameliorates_the_Effects_of_Ocean_Acidification_pdf/12871058 unknown doi:10.3389/fmars.2020.00704.s001 https://figshare.com/articles/figure/Image_1_Lower_Salinity_Leads_to_Improved_Physiological_Performance_in_the_Coccolithophorid_Emiliania_huxleyi_Which_Partly_Ameliorates_the_Effects_of_Ocean_Acidification_pdf/12871058 Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering calcification coccolithophore CO2 Emiliania huxleyi ocean acidification photosynthesis salinity Image Figure 2020 ftfrontimediafig https://doi.org/10.3389/fmars.2020.00704.s001 2020-09-02T22:56:34Z While seawater acidification induced by elevated CO 2 is known to impact coccolithophores, the effects in combination with decreased salinity caused by sea ice melting and/or hydrological events have not been documented. Here we show the combined effects of seawater acidification and reduced salinity on growth, photosynthesis and calcification of Emiliania huxleyi grown at 2 CO 2 concentrations (low CO 2 LC:400 μatm; high CO 2 HC:1000 μatm) and 3 levels of salinity (25, 30, and 35‰). A decrease of salinity from 35 to 25‰ increased growth rate, cell size and photosynthetic performance under both LC and HC. Calcification rates were relatively insensitive to salinity though they were higher in the LC-grown compared to the HC-grown cells at 25‰ salinity, with insignificant differences under 30 and 35‰. Since salinity and OA treatments did not show interactive effects on calcification, changes in calcification:photosynthesis ratios are attributed to the elevated photosynthetic rates at lower salinities, with higher ratios of calcification to photosynthesis in the cells grown under 35‰ compared with those grown at 25‰. In contrast, photosynthetic carbon fixation increased almost linearly with decreasing salinity, regardless of the pCO 2 treatments. When subjected to short-term exposure to high light, the low-salinity-grown cells showed the highest photochemical effective quantum yield with the highest repair rate, though the HC treatment enhanced the PSII damage rate. Our results suggest that, irrespective of pCO 2 , at low salinity Emiliania huxleyi up-regulates its photosynthetic performance which, despite a relatively insensitive calcification response, may help it better adapt to future ocean global environmental changes, including ocean acidification, especially in the coastal areas of high latitudes. Still Image Ocean acidification Sea ice Frontiers: Figshare |
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Frontiers: Figshare |
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ftfrontimediafig |
language |
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topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering calcification coccolithophore CO2 Emiliania huxleyi ocean acidification photosynthesis salinity |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering calcification coccolithophore CO2 Emiliania huxleyi ocean acidification photosynthesis salinity Jiekai Xu Jiazhen Sun John Beardall Kunshan Gao Image_1_Lower Salinity Leads to Improved Physiological Performance in the Coccolithophorid Emiliania huxleyi, Which Partly Ameliorates the Effects of Ocean Acidification.pdf |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering calcification coccolithophore CO2 Emiliania huxleyi ocean acidification photosynthesis salinity |
description |
While seawater acidification induced by elevated CO 2 is known to impact coccolithophores, the effects in combination with decreased salinity caused by sea ice melting and/or hydrological events have not been documented. Here we show the combined effects of seawater acidification and reduced salinity on growth, photosynthesis and calcification of Emiliania huxleyi grown at 2 CO 2 concentrations (low CO 2 LC:400 μatm; high CO 2 HC:1000 μatm) and 3 levels of salinity (25, 30, and 35‰). A decrease of salinity from 35 to 25‰ increased growth rate, cell size and photosynthetic performance under both LC and HC. Calcification rates were relatively insensitive to salinity though they were higher in the LC-grown compared to the HC-grown cells at 25‰ salinity, with insignificant differences under 30 and 35‰. Since salinity and OA treatments did not show interactive effects on calcification, changes in calcification:photosynthesis ratios are attributed to the elevated photosynthetic rates at lower salinities, with higher ratios of calcification to photosynthesis in the cells grown under 35‰ compared with those grown at 25‰. In contrast, photosynthetic carbon fixation increased almost linearly with decreasing salinity, regardless of the pCO 2 treatments. When subjected to short-term exposure to high light, the low-salinity-grown cells showed the highest photochemical effective quantum yield with the highest repair rate, though the HC treatment enhanced the PSII damage rate. Our results suggest that, irrespective of pCO 2 , at low salinity Emiliania huxleyi up-regulates its photosynthetic performance which, despite a relatively insensitive calcification response, may help it better adapt to future ocean global environmental changes, including ocean acidification, especially in the coastal areas of high latitudes. |
format |
Still Image |
author |
Jiekai Xu Jiazhen Sun John Beardall Kunshan Gao |
author_facet |
Jiekai Xu Jiazhen Sun John Beardall Kunshan Gao |
author_sort |
Jiekai Xu |
title |
Image_1_Lower Salinity Leads to Improved Physiological Performance in the Coccolithophorid Emiliania huxleyi, Which Partly Ameliorates the Effects of Ocean Acidification.pdf |
title_short |
Image_1_Lower Salinity Leads to Improved Physiological Performance in the Coccolithophorid Emiliania huxleyi, Which Partly Ameliorates the Effects of Ocean Acidification.pdf |
title_full |
Image_1_Lower Salinity Leads to Improved Physiological Performance in the Coccolithophorid Emiliania huxleyi, Which Partly Ameliorates the Effects of Ocean Acidification.pdf |
title_fullStr |
Image_1_Lower Salinity Leads to Improved Physiological Performance in the Coccolithophorid Emiliania huxleyi, Which Partly Ameliorates the Effects of Ocean Acidification.pdf |
title_full_unstemmed |
Image_1_Lower Salinity Leads to Improved Physiological Performance in the Coccolithophorid Emiliania huxleyi, Which Partly Ameliorates the Effects of Ocean Acidification.pdf |
title_sort |
image_1_lower salinity leads to improved physiological performance in the coccolithophorid emiliania huxleyi, which partly ameliorates the effects of ocean acidification.pdf |
publishDate |
2020 |
url |
https://doi.org/10.3389/fmars.2020.00704.s001 https://figshare.com/articles/figure/Image_1_Lower_Salinity_Leads_to_Improved_Physiological_Performance_in_the_Coccolithophorid_Emiliania_huxleyi_Which_Partly_Ameliorates_the_Effects_of_Ocean_Acidification_pdf/12871058 |
genre |
Ocean acidification Sea ice |
genre_facet |
Ocean acidification Sea ice |
op_relation |
doi:10.3389/fmars.2020.00704.s001 https://figshare.com/articles/figure/Image_1_Lower_Salinity_Leads_to_Improved_Physiological_Performance_in_the_Coccolithophorid_Emiliania_huxleyi_Which_Partly_Ameliorates_the_Effects_of_Ocean_Acidification_pdf/12871058 |
op_doi |
https://doi.org/10.3389/fmars.2020.00704.s001 |
_version_ |
1766157972431437824 |