Concentration boundary layers around complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae
Metabolic processes have the potential to modulate the effects of ocean acidification (OA) in nearshore macroalgal beds. We investigated whether natural mixed assemblages of the articulate coralline macroalga Arthrocardia corymbosa and understory crustose coralline algae (CCA) altered pH and O 2 con...
Published in: | Limnology and Oceanography |
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crwiley:10.4319/lo.2013.58.1.0121 2024-09-15T18:28:00+00:00 Concentration boundary layers around complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae Cornwall, Christopher E. Hepburn, Christopher D. Pilditch, Conrad A. Hurd, Catriona L. 2012 http://dx.doi.org/10.4319/lo.2013.58.1.0121 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2013.58.1.0121 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2013.58.1.0121 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 58, issue 1, page 121-130 ISSN 0024-3590 1939-5590 journal-article 2012 crwiley https://doi.org/10.4319/lo.2013.58.1.0121 2024-07-25T04:20:48Z Metabolic processes have the potential to modulate the effects of ocean acidification (OA) in nearshore macroalgal beds. We investigated whether natural mixed assemblages of the articulate coralline macroalga Arthrocardia corymbosa and understory crustose coralline algae (CCA) altered pH and O 2 concentrations within and immediately above their canopies. In a unidirectional flume, we tested the effect of water velocity (0–0.1 m s −1 ), bulk seawater pH (ambient pH 8.05, and pH 7.65), and irradiance (photosynthetically saturating light and darkness) on pH and O 2 concentration gradients, and the derived concentration boundary layer (CBL) thickness. At bulk seawater pH 7.65 and slow velocities (0 and 0.015 m s −1 ), pH at the CCA surface increased to 7.90–8.00 in the light. Although these manipulations were short term, this indicates a potential daytime buffering capacity that could alleviate the effects of OA. Photosynthetic activity also increased O 2 concentrations at the surface of the CCA. However, this moderating capacity was flow dependent; the CBL thickness decreased from an average of 26.8 mm from the CCA surface at 0.015 m s −1 to 4.1 mm at 0.04 m s −1 . The reverse trends occurred in the dark, with respiration causing pH and O 2 concentrations to decrease at the CCA surface. At all flow velocities the CBL thicknesses (up to 68 mm) were much greater than those previously published, indicating that the presence of canopies can alter the CBL substantially. In situ, the height of macroalgal canopies can be an order of magnitude larger than those used here, indicating that the degree of buffering to OA will be context dependent. Article in Journal/Newspaper Ocean acidification Wiley Online Library Limnology and Oceanography 58 1 121 130 |
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Wiley Online Library |
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English |
description |
Metabolic processes have the potential to modulate the effects of ocean acidification (OA) in nearshore macroalgal beds. We investigated whether natural mixed assemblages of the articulate coralline macroalga Arthrocardia corymbosa and understory crustose coralline algae (CCA) altered pH and O 2 concentrations within and immediately above their canopies. In a unidirectional flume, we tested the effect of water velocity (0–0.1 m s −1 ), bulk seawater pH (ambient pH 8.05, and pH 7.65), and irradiance (photosynthetically saturating light and darkness) on pH and O 2 concentration gradients, and the derived concentration boundary layer (CBL) thickness. At bulk seawater pH 7.65 and slow velocities (0 and 0.015 m s −1 ), pH at the CCA surface increased to 7.90–8.00 in the light. Although these manipulations were short term, this indicates a potential daytime buffering capacity that could alleviate the effects of OA. Photosynthetic activity also increased O 2 concentrations at the surface of the CCA. However, this moderating capacity was flow dependent; the CBL thickness decreased from an average of 26.8 mm from the CCA surface at 0.015 m s −1 to 4.1 mm at 0.04 m s −1 . The reverse trends occurred in the dark, with respiration causing pH and O 2 concentrations to decrease at the CCA surface. At all flow velocities the CBL thicknesses (up to 68 mm) were much greater than those previously published, indicating that the presence of canopies can alter the CBL substantially. In situ, the height of macroalgal canopies can be an order of magnitude larger than those used here, indicating that the degree of buffering to OA will be context dependent. |
format |
Article in Journal/Newspaper |
author |
Cornwall, Christopher E. Hepburn, Christopher D. Pilditch, Conrad A. Hurd, Catriona L. |
spellingShingle |
Cornwall, Christopher E. Hepburn, Christopher D. Pilditch, Conrad A. Hurd, Catriona L. Concentration boundary layers around complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae |
author_facet |
Cornwall, Christopher E. Hepburn, Christopher D. Pilditch, Conrad A. Hurd, Catriona L. |
author_sort |
Cornwall, Christopher E. |
title |
Concentration boundary layers around complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae |
title_short |
Concentration boundary layers around complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae |
title_full |
Concentration boundary layers around complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae |
title_fullStr |
Concentration boundary layers around complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae |
title_full_unstemmed |
Concentration boundary layers around complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae |
title_sort |
concentration boundary layers around complex assemblages of macroalgae: implications for the effects of ocean acidification on understory coralline algae |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.4319/lo.2013.58.1.0121 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2013.58.1.0121 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2013.58.1.0121 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Limnology and Oceanography volume 58, issue 1, page 121-130 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2013.58.1.0121 |
container_title |
Limnology and Oceanography |
container_volume |
58 |
container_issue |
1 |
container_start_page |
121 |
op_container_end_page |
130 |
_version_ |
1810469308665430016 |