Macroalgal responses to ocean acidification depend on nutrient and light levels. Frontiers in Marine Science
Ocean acidification may benefit algae that are able to capitalize on increased carbon availability for photosynthesis, but it is expected to have adverse effects on calcified algae through dissolution. Shifts in dominance between primary producers will have knock-on effects on marine ecosystems and...
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ftunivpalermo:oai:iris.unipa.it:10447/231153 2024-02-11T10:07:26+01:00 Macroalgal responses to ocean acidification depend on nutrient and light levels. Frontiers in Marine Science Celis Plá, P. S. Hall Spencer, J. M. Horta, P. A. MILAZZO, Marco Korbee, N. Cornwall, C. E. Figueroa, F. L. Celis-Plá, P. S. Hall-Spencer, J. M. Horta, P. A. Milazzo, M. Korbee, N. Cornwall, C. E. Figueroa, F. L. 2015 http://hdl.handle.net/10447/231153 https://doi.org/10.3389/fmars.2015.00026 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000485324300029 volume:2 issue:26 numberofpages:12 journal:FRONTIERS IN MARINE SCIENCE http://hdl.handle.net/10447/231153 doi:10.3389/fmars.2015.00026 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85008689741 info:eu-repo/semantics/openAccess ocean acidification macroalgae CO2 seep Vulcano Island Mediterranean Settore BIO/07 - Ecologia info:eu-repo/semantics/article 2015 ftunivpalermo https://doi.org/10.3389/fmars.2015.00026 2024-01-23T23:27:15Z Ocean acidification may benefit algae that are able to capitalize on increased carbon availability for photosynthesis, but it is expected to have adverse effects on calcified algae through dissolution. Shifts in dominance between primary producers will have knock-on effects on marine ecosystems and will likely vary regionally, depending on factors such as irradiance (light vs. shade) and nutrient levels (oligotrophic vs. eutrophic). Thus experiments are needed to evaluate interactive effects of combined stressors in the field. In this study, we investigated the physiological responses of macroalgae near a CO2 seep in oligotrophic waters off Vulcano (Italy). The algae were incubated in situ at 0.2 m depth using a combination of three mean CO2 levels (500, 700–800 and 1200 μatm CO2), two light levels (100 and 70% of surface irradiance) and two nutrient levels of N, P, and K (enriched vs. non-enriched treatments) in the non-calcified macroalga Cystoseira compressa (Phaeophyceae, Fucales) and calcified Padina pavonica (Phaeophyceae, Dictyotales). A suite of biochemical assays and in vivo chlorophyll a fluorescence parameters showed that elevated CO2 levels benefitted both of these algae, although their responses varied depending on light and nutrient availability. In C. compressa, elevated CO2 treatments resulted in higher carbon content and antioxidant activity in shaded conditions both with and without nutrient enrichment—they had more Chla, phenols and fucoxanthin with nutrient enrichment and higher quantum yield (Fv/Fm) and photosynthetic efficiency (αETR) without nutrient enrichment. In P. pavonica, elevated CO2 treatments had higher carbon content, Fv/Fm, αETR, and Chla regardless of nutrient levels—they had higher concentrations of phenolic compounds in nutrient enriched, fully-lit conditions and more antioxidants in shaded, nutrient enriched conditions. Nitrogen content increased significantly in fertilized treatments, confirming that these algae were nutrient limited in this oligotrophic part of the ... Article in Journal/Newspaper Ocean acidification IRIS Università degli Studi di Palermo Frontiers in Marine Science 2 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Palermo |
op_collection_id |
ftunivpalermo |
language |
English |
topic |
ocean acidification macroalgae CO2 seep Vulcano Island Mediterranean Settore BIO/07 - Ecologia |
spellingShingle |
ocean acidification macroalgae CO2 seep Vulcano Island Mediterranean Settore BIO/07 - Ecologia Celis Plá, P. S. Hall Spencer, J. M. Horta, P. A. MILAZZO, Marco Korbee, N. Cornwall, C. E. Figueroa, F. L. Macroalgal responses to ocean acidification depend on nutrient and light levels. Frontiers in Marine Science |
topic_facet |
ocean acidification macroalgae CO2 seep Vulcano Island Mediterranean Settore BIO/07 - Ecologia |
description |
Ocean acidification may benefit algae that are able to capitalize on increased carbon availability for photosynthesis, but it is expected to have adverse effects on calcified algae through dissolution. Shifts in dominance between primary producers will have knock-on effects on marine ecosystems and will likely vary regionally, depending on factors such as irradiance (light vs. shade) and nutrient levels (oligotrophic vs. eutrophic). Thus experiments are needed to evaluate interactive effects of combined stressors in the field. In this study, we investigated the physiological responses of macroalgae near a CO2 seep in oligotrophic waters off Vulcano (Italy). The algae were incubated in situ at 0.2 m depth using a combination of three mean CO2 levels (500, 700–800 and 1200 μatm CO2), two light levels (100 and 70% of surface irradiance) and two nutrient levels of N, P, and K (enriched vs. non-enriched treatments) in the non-calcified macroalga Cystoseira compressa (Phaeophyceae, Fucales) and calcified Padina pavonica (Phaeophyceae, Dictyotales). A suite of biochemical assays and in vivo chlorophyll a fluorescence parameters showed that elevated CO2 levels benefitted both of these algae, although their responses varied depending on light and nutrient availability. In C. compressa, elevated CO2 treatments resulted in higher carbon content and antioxidant activity in shaded conditions both with and without nutrient enrichment—they had more Chla, phenols and fucoxanthin with nutrient enrichment and higher quantum yield (Fv/Fm) and photosynthetic efficiency (αETR) without nutrient enrichment. In P. pavonica, elevated CO2 treatments had higher carbon content, Fv/Fm, αETR, and Chla regardless of nutrient levels—they had higher concentrations of phenolic compounds in nutrient enriched, fully-lit conditions and more antioxidants in shaded, nutrient enriched conditions. Nitrogen content increased significantly in fertilized treatments, confirming that these algae were nutrient limited in this oligotrophic part of the ... |
author2 |
Celis-Plá, P. S. Hall-Spencer, J. M. Horta, P. A. Milazzo, M. Korbee, N. Cornwall, C. E. Figueroa, F. L. |
format |
Article in Journal/Newspaper |
author |
Celis Plá, P. S. Hall Spencer, J. M. Horta, P. A. MILAZZO, Marco Korbee, N. Cornwall, C. E. Figueroa, F. L. |
author_facet |
Celis Plá, P. S. Hall Spencer, J. M. Horta, P. A. MILAZZO, Marco Korbee, N. Cornwall, C. E. Figueroa, F. L. |
author_sort |
Celis Plá, P. S. |
title |
Macroalgal responses to ocean acidification depend on nutrient and light levels. Frontiers in Marine Science |
title_short |
Macroalgal responses to ocean acidification depend on nutrient and light levels. Frontiers in Marine Science |
title_full |
Macroalgal responses to ocean acidification depend on nutrient and light levels. Frontiers in Marine Science |
title_fullStr |
Macroalgal responses to ocean acidification depend on nutrient and light levels. Frontiers in Marine Science |
title_full_unstemmed |
Macroalgal responses to ocean acidification depend on nutrient and light levels. Frontiers in Marine Science |
title_sort |
macroalgal responses to ocean acidification depend on nutrient and light levels. frontiers in marine science |
publishDate |
2015 |
url |
http://hdl.handle.net/10447/231153 https://doi.org/10.3389/fmars.2015.00026 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000485324300029 volume:2 issue:26 numberofpages:12 journal:FRONTIERS IN MARINE SCIENCE http://hdl.handle.net/10447/231153 doi:10.3389/fmars.2015.00026 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85008689741 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/fmars.2015.00026 |
container_title |
Frontiers in Marine Science |
container_volume |
2 |
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1790605995348590592 |