Mineralogical response of the Mediterranean crustose coralline alga Lithophyllum cabiochae to near-future ocean acidification and warming
Red calcareous coralline algae are thought to be among the organisms most vulnerable to ocean acidification due to the high solubility of their magnesium calcite skeleton. Although skeletal mineralogy is proposed to change as CO 2 and temperature continue to rise, there is currently very little info...
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ftcopernicus:oai:publications.copernicus.org:bg51058 2023-05-15T17:49:44+02:00 Mineralogical response of the Mediterranean crustose coralline alga Lithophyllum cabiochae to near-future ocean acidification and warming Nash, Merinda C. Martin, Sophie Gattuso, Jean-Pierre 2018-09-27 application/pdf https://doi.org/10.5194/bg-13-5937-2016 https://www.biogeosciences.net/13/5937/2016/ eng eng doi:10.5194/bg-13-5937-2016 https://www.biogeosciences.net/13/5937/2016/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-13-5937-2016 2019-12-24T09:51:51Z Red calcareous coralline algae are thought to be among the organisms most vulnerable to ocean acidification due to the high solubility of their magnesium calcite skeleton. Although skeletal mineralogy is proposed to change as CO 2 and temperature continue to rise, there is currently very little information available on the response of coralline algal carbonate mineralogy to near-future changes in p CO 2 and temperature. Here we present results from a 1-year controlled laboratory experiment to test mineralogical responses to p CO 2 and temperature in the Mediterranean crustose coralline alga (CCA) Lithophyllum cabiochae . Our results show that Mg incorporation is mainly constrained by temperature (+1 mol % MgCO 3 for an increase of 3 °C), and there was no response to p CO 2 . This suggests that L. cabiochae thalli have the ability to buffer their calcifying medium against ocean acidification, thereby enabling them to continue to deposit magnesium calcite with a significant mol % MgCO 3 under elevated p CO 2 . Analyses of CCA dissolution chips showed a decrease in Mg content after 1 year for all treatments, but this was affected neither by p CO 2 nor by temperature. Our findings suggest that biological processes exert a strong control on calcification on magnesium calcite and that CCA may be more resilient under rising CO 2 than previously thought. However, previously demonstrated increased skeletal dissolution with ocean acidification will still have major consequences for the stability and maintenance of Mediterranean coralligenous habitats. Text Ocean acidification Copernicus Publications: E-Journals Biogeosciences 13 21 5937 5945 |
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English |
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Red calcareous coralline algae are thought to be among the organisms most vulnerable to ocean acidification due to the high solubility of their magnesium calcite skeleton. Although skeletal mineralogy is proposed to change as CO 2 and temperature continue to rise, there is currently very little information available on the response of coralline algal carbonate mineralogy to near-future changes in p CO 2 and temperature. Here we present results from a 1-year controlled laboratory experiment to test mineralogical responses to p CO 2 and temperature in the Mediterranean crustose coralline alga (CCA) Lithophyllum cabiochae . Our results show that Mg incorporation is mainly constrained by temperature (+1 mol % MgCO 3 for an increase of 3 °C), and there was no response to p CO 2 . This suggests that L. cabiochae thalli have the ability to buffer their calcifying medium against ocean acidification, thereby enabling them to continue to deposit magnesium calcite with a significant mol % MgCO 3 under elevated p CO 2 . Analyses of CCA dissolution chips showed a decrease in Mg content after 1 year for all treatments, but this was affected neither by p CO 2 nor by temperature. Our findings suggest that biological processes exert a strong control on calcification on magnesium calcite and that CCA may be more resilient under rising CO 2 than previously thought. However, previously demonstrated increased skeletal dissolution with ocean acidification will still have major consequences for the stability and maintenance of Mediterranean coralligenous habitats. |
format |
Text |
author |
Nash, Merinda C. Martin, Sophie Gattuso, Jean-Pierre |
spellingShingle |
Nash, Merinda C. Martin, Sophie Gattuso, Jean-Pierre Mineralogical response of the Mediterranean crustose coralline alga Lithophyllum cabiochae to near-future ocean acidification and warming |
author_facet |
Nash, Merinda C. Martin, Sophie Gattuso, Jean-Pierre |
author_sort |
Nash, Merinda C. |
title |
Mineralogical response of the Mediterranean crustose coralline alga Lithophyllum cabiochae to near-future ocean acidification and warming |
title_short |
Mineralogical response of the Mediterranean crustose coralline alga Lithophyllum cabiochae to near-future ocean acidification and warming |
title_full |
Mineralogical response of the Mediterranean crustose coralline alga Lithophyllum cabiochae to near-future ocean acidification and warming |
title_fullStr |
Mineralogical response of the Mediterranean crustose coralline alga Lithophyllum cabiochae to near-future ocean acidification and warming |
title_full_unstemmed |
Mineralogical response of the Mediterranean crustose coralline alga Lithophyllum cabiochae to near-future ocean acidification and warming |
title_sort |
mineralogical response of the mediterranean crustose coralline alga lithophyllum cabiochae to near-future ocean acidification and warming |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-13-5937-2016 https://www.biogeosciences.net/13/5937/2016/ |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-13-5937-2016 https://www.biogeosciences.net/13/5937/2016/ |
op_doi |
https://doi.org/10.5194/bg-13-5937-2016 |
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Biogeosciences |
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13 |
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21 |
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5937 |
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5945 |
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1766156175305342976 |