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 O₂ conc...
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ftunivwaikato:oai:researchcommons.waikato.ac.nz:10289/7080 2024-01-21T10:09:14+01:00 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 https://hdl.handle.net/10289/7080 https://doi.org/10.4319/lo.2013.58.1.0121 en eng Association for the Sciences of Limnology and Oceanography http://www.aslo.org/lo/ Limnology and Oceanography Cornwall, C.E., Hepburn, C.D., Pilditch, C.A. & Hurd, C.L. (2013). Concentration boundary layers around complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae. Limnology and Oceanography, 58(1), 121-130. 0024-3590 https://hdl.handle.net/10289/7080 doi:10.4319/lo.2013.58.1.0121 Journal Article 2012 ftunivwaikato https://doi.org/10.4319/lo.2013.58.1.0121 2023-12-26T18:25:26Z 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 O₂ concentrations within and immediately above their canopies. In a unidirectional flume, we tested the effect of water velocity (0-0.1 ms⁻¹), bulk seawater pH (ambient pH 8.05, and pH 7.65), and irradiance (photosynthetically saturating light and darkness) on pH and O₂ concentration gradients, and the derived concentration boundary layer (CBL) thickness. At bulk seawater pH 7.65 and slow velocities (0 and 0.015 ms⁻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 O2 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 ms⁻¹ to 4.1 mm at 0.04 ms⁻¹. The reverse trends occurred in the dark, with respiration causing pH and O2 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 The University of Waikato: Research Commons Limnology and Oceanography 58 1 121 130 |
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Open Polar |
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The University of Waikato: Research Commons |
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ftunivwaikato |
language |
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 O₂ concentrations within and immediately above their canopies. In a unidirectional flume, we tested the effect of water velocity (0-0.1 ms⁻¹), bulk seawater pH (ambient pH 8.05, and pH 7.65), and irradiance (photosynthetically saturating light and darkness) on pH and O₂ concentration gradients, and the derived concentration boundary layer (CBL) thickness. At bulk seawater pH 7.65 and slow velocities (0 and 0.015 ms⁻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 O2 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 ms⁻¹ to 4.1 mm at 0.04 ms⁻¹. The reverse trends occurred in the dark, with respiration causing pH and O2 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 |
Association for the Sciences of Limnology and Oceanography |
publishDate |
2012 |
url |
https://hdl.handle.net/10289/7080 https://doi.org/10.4319/lo.2013.58.1.0121 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
http://www.aslo.org/lo/ Limnology and Oceanography Cornwall, C.E., Hepburn, C.D., Pilditch, C.A. & Hurd, C.L. (2013). Concentration boundary layers around complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae. Limnology and Oceanography, 58(1), 121-130. 0024-3590 https://hdl.handle.net/10289/7080 doi:10.4319/lo.2013.58.1.0121 |
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 |
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1788700189332078592 |