Responses of seaweeds that use CO2 as their sole inorganic carbon source to ocean acidification: differential effects of fluctuating pH but little benefit of CO2 enrichment
Abstract Laboratory studies that test the responses of coastal organisms to ocean acidification (OA) typically use constant pH regimes which do not reflect coastal systems, such as seaweed beds, where pH fluctuates on diel cycles. Seaweeds that use CO2 as their sole inorganic carbon source (non-carb...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsz070 http://academic.oup.com/icesjms/article-pdf/76/6/1860/31247241/fsz070.pdf |
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croxfordunivpr:10.1093/icesjms/fsz070 2024-09-15T18:27:54+00:00 Responses of seaweeds that use CO2 as their sole inorganic carbon source to ocean acidification: differential effects of fluctuating pH but little benefit of CO2 enrichment Britton, Damon Mundy, Craig N McGraw, Christina M Revill, Andrew T Hurd, Catriona L Norkko, Joanna University of Tasmania 2019 http://dx.doi.org/10.1093/icesjms/fsz070 http://academic.oup.com/icesjms/article-pdf/76/6/1860/31247241/fsz070.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model ICES Journal of Marine Science volume 76, issue 6, page 1860-1870 ISSN 1054-3139 1095-9289 journal-article 2019 croxfordunivpr https://doi.org/10.1093/icesjms/fsz070 2024-08-19T04:22:56Z Abstract Laboratory studies that test the responses of coastal organisms to ocean acidification (OA) typically use constant pH regimes which do not reflect coastal systems, such as seaweed beds, where pH fluctuates on diel cycles. Seaweeds that use CO2 as their sole inorganic carbon source (non-carbon dioxide concentrating mechanism species) are predicted to benefit from OA as concentrations of dissolved CO2 increase, yet this prediction has rarely been tested, and no studies have tested the effect of pH fluctuations on non-CCM seaweeds. We conducted a laboratory experiment in which two ecologically dominant non-CCM red seaweeds (Callophyllis lambertii and Plocamium dilatatum) were exposed to four pH treatments: two static, pHT 8.0 and 7.7 and two fluctuating, pHT 8.0 ± 0.3 and 7.7 ± 0.3. Fluctuating pH reduced growth and net photosynthesis in C. lambertii, while P. dilatatum was unaffected. OA did not benefit P. dilatatum, while C. lambertii displayed elevated net photosynthetic rates. We provide evidence that carbon uptake strategy alone cannot be used as a predictor of seaweed responses to OA and highlight the importance of species-specific sensitivity to [H+]. We also emphasize the importance of including realistic pH fluctuations in experimental studies on coastal organisms. Article in Journal/Newspaper Ocean acidification Oxford University Press ICES Journal of Marine Science 76 6 1860 1870 |
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Oxford University Press |
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croxfordunivpr |
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English |
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Abstract Laboratory studies that test the responses of coastal organisms to ocean acidification (OA) typically use constant pH regimes which do not reflect coastal systems, such as seaweed beds, where pH fluctuates on diel cycles. Seaweeds that use CO2 as their sole inorganic carbon source (non-carbon dioxide concentrating mechanism species) are predicted to benefit from OA as concentrations of dissolved CO2 increase, yet this prediction has rarely been tested, and no studies have tested the effect of pH fluctuations on non-CCM seaweeds. We conducted a laboratory experiment in which two ecologically dominant non-CCM red seaweeds (Callophyllis lambertii and Plocamium dilatatum) were exposed to four pH treatments: two static, pHT 8.0 and 7.7 and two fluctuating, pHT 8.0 ± 0.3 and 7.7 ± 0.3. Fluctuating pH reduced growth and net photosynthesis in C. lambertii, while P. dilatatum was unaffected. OA did not benefit P. dilatatum, while C. lambertii displayed elevated net photosynthetic rates. We provide evidence that carbon uptake strategy alone cannot be used as a predictor of seaweed responses to OA and highlight the importance of species-specific sensitivity to [H+]. We also emphasize the importance of including realistic pH fluctuations in experimental studies on coastal organisms. |
author2 |
Norkko, Joanna University of Tasmania |
format |
Article in Journal/Newspaper |
author |
Britton, Damon Mundy, Craig N McGraw, Christina M Revill, Andrew T Hurd, Catriona L |
spellingShingle |
Britton, Damon Mundy, Craig N McGraw, Christina M Revill, Andrew T Hurd, Catriona L Responses of seaweeds that use CO2 as their sole inorganic carbon source to ocean acidification: differential effects of fluctuating pH but little benefit of CO2 enrichment |
author_facet |
Britton, Damon Mundy, Craig N McGraw, Christina M Revill, Andrew T Hurd, Catriona L |
author_sort |
Britton, Damon |
title |
Responses of seaweeds that use CO2 as their sole inorganic carbon source to ocean acidification: differential effects of fluctuating pH but little benefit of CO2 enrichment |
title_short |
Responses of seaweeds that use CO2 as their sole inorganic carbon source to ocean acidification: differential effects of fluctuating pH but little benefit of CO2 enrichment |
title_full |
Responses of seaweeds that use CO2 as their sole inorganic carbon source to ocean acidification: differential effects of fluctuating pH but little benefit of CO2 enrichment |
title_fullStr |
Responses of seaweeds that use CO2 as their sole inorganic carbon source to ocean acidification: differential effects of fluctuating pH but little benefit of CO2 enrichment |
title_full_unstemmed |
Responses of seaweeds that use CO2 as their sole inorganic carbon source to ocean acidification: differential effects of fluctuating pH but little benefit of CO2 enrichment |
title_sort |
responses of seaweeds that use co2 as their sole inorganic carbon source to ocean acidification: differential effects of fluctuating ph but little benefit of co2 enrichment |
publisher |
Oxford University Press (OUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1093/icesjms/fsz070 http://academic.oup.com/icesjms/article-pdf/76/6/1860/31247241/fsz070.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
ICES Journal of Marine Science volume 76, issue 6, page 1860-1870 ISSN 1054-3139 1095-9289 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/icesjms/fsz070 |
container_title |
ICES Journal of Marine Science |
container_volume |
76 |
container_issue |
6 |
container_start_page |
1860 |
op_container_end_page |
1870 |
_version_ |
1810469189338529792 |