Elevated CO2 Leads to Enhanced Photosynthesis but Decreased Growth in Early Life Stages of Reef Building Coralline Algae
Crustose coralline algae (CCA) are key organisms in coral reef ecosystems, where they contribute to reef building and substrate stabilization. While ocean acidification due to increasing CO2 can affect the biology, physiology and ecology of fully developed CCA, the impacts of elevated CO2 on the ear...
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ftdoajarticles:oai:doaj.org/article:1b7a58bf4f0e41ad81afd723a7d2a299 2023-05-15T17:49:44+02:00 Elevated CO2 Leads to Enhanced Photosynthesis but Decreased Growth in Early Life Stages of Reef Building Coralline Algae Alexandra Ordoñez Daniel Wangpraseurt Niclas Heidelberg Lyndby Michael Kühl Guillermo Diaz-Pulido 2019-01-01T00:00:00Z https://doi.org/10.3389/fmars.2018.00495 https://doaj.org/article/1b7a58bf4f0e41ad81afd723a7d2a299 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fmars.2018.00495/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2018.00495 https://doaj.org/article/1b7a58bf4f0e41ad81afd723a7d2a299 Frontiers in Marine Science, Vol 5 (2019) ocean acidification global warming early stages red algae algal physiology photosynthesis Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2019 ftdoajarticles https://doi.org/10.3389/fmars.2018.00495 2022-12-30T22:54:14Z Crustose coralline algae (CCA) are key organisms in coral reef ecosystems, where they contribute to reef building and substrate stabilization. While ocean acidification due to increasing CO2 can affect the biology, physiology and ecology of fully developed CCA, the impacts of elevated CO2 on the early life stages of CCA are much less explored. We assessed the photosynthetic activity and growth of 10-day-old recruits of the reef-building crustose coralline alga Porolithon cf. onkodes exposed to ambient and enhanced CO2 seawater concentration causing a downward shift in pH of ∼0.3 units. Growth of the CCA was estimated using measurements of crust thickness and marginal expansion, while photosynthetic activity was studied with O2 microsensors. We found that elevated seawater CO2 enhanced gross photosynthesis and respiration, but significantly reduced vertical and marginal growth of the early life stages of P. cf. onkodes. Elevated CO2 stimulated photosynthesis, particularly at high irradiance, likely due to increased availability of CO2, but this increase did not translate into increased algal growth as expected, suggesting a decoupling of these two processes under ocean acidification scenarios. This study confirms the sensitivity of early stages of CCA to elevated CO2 and identifies complexities in the physiological processes underlying the decreased growth and abundance in these important coral reef builders upon ocean acidification. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 5 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
ocean acidification global warming early stages red algae algal physiology photosynthesis Science Q General. Including nature conservation geographical distribution QH1-199.5 |
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ocean acidification global warming early stages red algae algal physiology photosynthesis Science Q General. Including nature conservation geographical distribution QH1-199.5 Alexandra Ordoñez Daniel Wangpraseurt Niclas Heidelberg Lyndby Michael Kühl Guillermo Diaz-Pulido Elevated CO2 Leads to Enhanced Photosynthesis but Decreased Growth in Early Life Stages of Reef Building Coralline Algae |
topic_facet |
ocean acidification global warming early stages red algae algal physiology photosynthesis Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Crustose coralline algae (CCA) are key organisms in coral reef ecosystems, where they contribute to reef building and substrate stabilization. While ocean acidification due to increasing CO2 can affect the biology, physiology and ecology of fully developed CCA, the impacts of elevated CO2 on the early life stages of CCA are much less explored. We assessed the photosynthetic activity and growth of 10-day-old recruits of the reef-building crustose coralline alga Porolithon cf. onkodes exposed to ambient and enhanced CO2 seawater concentration causing a downward shift in pH of ∼0.3 units. Growth of the CCA was estimated using measurements of crust thickness and marginal expansion, while photosynthetic activity was studied with O2 microsensors. We found that elevated seawater CO2 enhanced gross photosynthesis and respiration, but significantly reduced vertical and marginal growth of the early life stages of P. cf. onkodes. Elevated CO2 stimulated photosynthesis, particularly at high irradiance, likely due to increased availability of CO2, but this increase did not translate into increased algal growth as expected, suggesting a decoupling of these two processes under ocean acidification scenarios. This study confirms the sensitivity of early stages of CCA to elevated CO2 and identifies complexities in the physiological processes underlying the decreased growth and abundance in these important coral reef builders upon ocean acidification. |
format |
Article in Journal/Newspaper |
author |
Alexandra Ordoñez Daniel Wangpraseurt Niclas Heidelberg Lyndby Michael Kühl Guillermo Diaz-Pulido |
author_facet |
Alexandra Ordoñez Daniel Wangpraseurt Niclas Heidelberg Lyndby Michael Kühl Guillermo Diaz-Pulido |
author_sort |
Alexandra Ordoñez |
title |
Elevated CO2 Leads to Enhanced Photosynthesis but Decreased Growth in Early Life Stages of Reef Building Coralline Algae |
title_short |
Elevated CO2 Leads to Enhanced Photosynthesis but Decreased Growth in Early Life Stages of Reef Building Coralline Algae |
title_full |
Elevated CO2 Leads to Enhanced Photosynthesis but Decreased Growth in Early Life Stages of Reef Building Coralline Algae |
title_fullStr |
Elevated CO2 Leads to Enhanced Photosynthesis but Decreased Growth in Early Life Stages of Reef Building Coralline Algae |
title_full_unstemmed |
Elevated CO2 Leads to Enhanced Photosynthesis but Decreased Growth in Early Life Stages of Reef Building Coralline Algae |
title_sort |
elevated co2 leads to enhanced photosynthesis but decreased growth in early life stages of reef building coralline algae |
publisher |
Frontiers Media S.A. |
publishDate |
2019 |
url |
https://doi.org/10.3389/fmars.2018.00495 https://doaj.org/article/1b7a58bf4f0e41ad81afd723a7d2a299 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Frontiers in Marine Science, Vol 5 (2019) |
op_relation |
https://www.frontiersin.org/article/10.3389/fmars.2018.00495/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2018.00495 https://doaj.org/article/1b7a58bf4f0e41ad81afd723a7d2a299 |
op_doi |
https://doi.org/10.3389/fmars.2018.00495 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
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1766156179611844608 |