Elevated pCO 2 enhances under light but reduces in darkness the growth rate of a diatom, with implications for the fate of phytoplankton below the photic zone
Abstract Experimentally elevated pCO 2 and the associated pH drop are known to differentially affect many aspects of the physiology of diatoms under different environmental conditions or in different regions. However, contrasting responses to elevated pCO 2 in the dark and light periods of a diel cy...
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crwiley:10.1002/lno.11903 2024-06-02T08:12:37+00:00 Elevated pCO 2 enhances under light but reduces in darkness the growth rate of a diatom, with implications for the fate of phytoplankton below the photic zone Qu, Liming Beardall, John Jiang, Xiaowen Gao, Kunshan National Natural Science Foundation of China 2021 http://dx.doi.org/10.1002/lno.11903 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11903 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11903 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11903 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 66, issue 10, page 3630-3642 ISSN 0024-3590 1939-5590 journal-article 2021 crwiley https://doi.org/10.1002/lno.11903 2024-05-03T12:05:09Z Abstract Experimentally elevated pCO 2 and the associated pH drop are known to differentially affect many aspects of the physiology of diatoms under different environmental conditions or in different regions. However, contrasting responses to elevated pCO 2 in the dark and light periods of a diel cycle have not been documented. By growing the model diatom Phaeodactylum tricornutum under 3 light levels and 2 different CO 2 concentrations, we found that the elevated pCO 2 /pH drop projected for future ocean acidification reduced the diatom's growth rate by 8–25% during the night period but increased it by up to 9–21% in the light period, resulting in insignificant changes in growth over the diel cycle under the three different light levels. The elevated pCO 2 increased the respiration rates irrespective of growth light levels and light or dark periods and enhanced its photosynthetic performance during daytime. With prolonged exposure to complete darkness, simulating the sinking process in the dark zones of the ocean, the growth rates decreased faster under elevated pCO 2 , along with a faster decline in quantum yield and cell size. Our results suggest that elevated pCO 2 enhances the diatom's respiratory energy supplies to cope with acidic stress during the night period but enhances its death rate when the cells sink to dark regions of the oceans below the photic zone, with implications for a possible acidification‐induced reduction in vertical transport of organic carbon. Article in Journal/Newspaper Ocean acidification Wiley Online Library Limnology and Oceanography 66 10 3630 3642 |
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English |
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Abstract Experimentally elevated pCO 2 and the associated pH drop are known to differentially affect many aspects of the physiology of diatoms under different environmental conditions or in different regions. However, contrasting responses to elevated pCO 2 in the dark and light periods of a diel cycle have not been documented. By growing the model diatom Phaeodactylum tricornutum under 3 light levels and 2 different CO 2 concentrations, we found that the elevated pCO 2 /pH drop projected for future ocean acidification reduced the diatom's growth rate by 8–25% during the night period but increased it by up to 9–21% in the light period, resulting in insignificant changes in growth over the diel cycle under the three different light levels. The elevated pCO 2 increased the respiration rates irrespective of growth light levels and light or dark periods and enhanced its photosynthetic performance during daytime. With prolonged exposure to complete darkness, simulating the sinking process in the dark zones of the ocean, the growth rates decreased faster under elevated pCO 2 , along with a faster decline in quantum yield and cell size. Our results suggest that elevated pCO 2 enhances the diatom's respiratory energy supplies to cope with acidic stress during the night period but enhances its death rate when the cells sink to dark regions of the oceans below the photic zone, with implications for a possible acidification‐induced reduction in vertical transport of organic carbon. |
author2 |
National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Qu, Liming Beardall, John Jiang, Xiaowen Gao, Kunshan |
spellingShingle |
Qu, Liming Beardall, John Jiang, Xiaowen Gao, Kunshan Elevated pCO 2 enhances under light but reduces in darkness the growth rate of a diatom, with implications for the fate of phytoplankton below the photic zone |
author_facet |
Qu, Liming Beardall, John Jiang, Xiaowen Gao, Kunshan |
author_sort |
Qu, Liming |
title |
Elevated pCO 2 enhances under light but reduces in darkness the growth rate of a diatom, with implications for the fate of phytoplankton below the photic zone |
title_short |
Elevated pCO 2 enhances under light but reduces in darkness the growth rate of a diatom, with implications for the fate of phytoplankton below the photic zone |
title_full |
Elevated pCO 2 enhances under light but reduces in darkness the growth rate of a diatom, with implications for the fate of phytoplankton below the photic zone |
title_fullStr |
Elevated pCO 2 enhances under light but reduces in darkness the growth rate of a diatom, with implications for the fate of phytoplankton below the photic zone |
title_full_unstemmed |
Elevated pCO 2 enhances under light but reduces in darkness the growth rate of a diatom, with implications for the fate of phytoplankton below the photic zone |
title_sort |
elevated pco 2 enhances under light but reduces in darkness the growth rate of a diatom, with implications for the fate of phytoplankton below the photic zone |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/lno.11903 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11903 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11903 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11903 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Limnology and Oceanography volume 66, issue 10, page 3630-3642 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/lno.11903 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
10 |
container_start_page |
3630 |
op_container_end_page |
3642 |
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1800759122870665216 |