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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ftinfoscience:oai:infoscience.epfl.ch:276263 2023-05-15T17:50:00+02:00 Elevated CO2 Leads to Enhanced Photosynthesis but Decreased Growth in Early Life Stages of Reef Building Coralline Algae Ordoñez, Alexandra Wangpraseurt, Daniel Lyndby, Niclas Heidelberg Kühl, Michael Diaz-Pulido, Guillermo 2020-03-16T13:10:56Z https://doi.org/10.3389/fmars.2018.00495 https://infoscience.epfl.ch/record/276263/files/Ordo%C3%B1ez-2019.pdf http://infoscience.epfl.ch/record/276263 unknown doi:10.3389/fmars.2018.00495 https://infoscience.epfl.ch/record/276263/files/Ordo%C3%B1ez-2019.pdf http://infoscience.epfl.ch/record/276263 http://infoscience.epfl.ch/record/276263 Text 2020 ftinfoscience https://doi.org/10.3389/fmars.2018.00495 2023-02-13T22:59:16Z 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. Text Ocean acidification EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) Frontiers in Marine Science 5 |
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EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) |
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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 |
Text |
author |
Ordoñez, Alexandra Wangpraseurt, Daniel Lyndby, Niclas Heidelberg Kühl, Michael Diaz-Pulido, Guillermo |
spellingShingle |
Ordoñez, Alexandra Wangpraseurt, Daniel Lyndby, Niclas Heidelberg Kühl, Michael Diaz-Pulido, Guillermo Elevated CO2 Leads to Enhanced Photosynthesis but Decreased Growth in Early Life Stages of Reef Building Coralline Algae |
author_facet |
Ordoñez, Alexandra Wangpraseurt, Daniel Lyndby, Niclas Heidelberg Kühl, Michael Diaz-Pulido, Guillermo |
author_sort |
Ordoñez, Alexandra |
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 |
publishDate |
2020 |
url |
https://doi.org/10.3389/fmars.2018.00495 https://infoscience.epfl.ch/record/276263/files/Ordo%C3%B1ez-2019.pdf http://infoscience.epfl.ch/record/276263 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
http://infoscience.epfl.ch/record/276263 |
op_relation |
doi:10.3389/fmars.2018.00495 https://infoscience.epfl.ch/record/276263/files/Ordo%C3%B1ez-2019.pdf http://infoscience.epfl.ch/record/276263 |
op_doi |
https://doi.org/10.3389/fmars.2018.00495 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
_version_ |
1766156560099180544 |