Concentration boundary layers and 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 nearshoremacroalgal 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 conc...
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ftunivtasecite:oai:ecite.utas.edu.au:91461 2023-05-15T17:50:47+02:00 Concentration boundary layers and complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae Cornwall, CE Hepburn, CD Pilditch, CA Hurd, CL 2013 application/pdf https://doi.org/10.4319/lo.2013.58.1.0121 http://ecite.utas.edu.au/91461 en eng Amer Soc Limnology Oceanography http://ecite.utas.edu.au/91461/1/Cornwall et al 2013a.pdf http://dx.doi.org/10.4319/lo.2013.58.1.0121 Cornwall, CE and Hepburn, CD and Pilditch, CA and Hurd, CL, Concentration boundary layers and complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae, Limnology and Oceanography, 58, (1) pp. 121-130. ISSN 0024-3590 (2013) [Refereed Article] http://ecite.utas.edu.au/91461 Environmental Sciences Ecological Applications Ecological Impacts of Climate Change Refereed Article PeerReviewed 2013 ftunivtasecite https://doi.org/10.4319/lo.2013.58.1.0121 2019-12-13T21:54:38Z Metabolic processes have the potential to modulate the effects of ocean acidification (OA) in nearshoremacroalgal 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 withinand immediately above their canopies. In a unidirectional flume, we tested the effect of water velocity (00.1 m s -1 ), bulk seawater pH (ambient pH 8.05, and pH 7.65), and irradiance (photosynthetically saturating lightand 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 to7.908.00 in the light. Although these manipulations were short term, this indicates a potential daytime bufferingcapacity that could alleviate the effects of OA. Photosynthetic activity also increased O 2 concentrations at thesurface of the CCA. However, this moderating capacity was flow dependent; the CBL thickness decreased froman 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 occurredin the dark, with respiration causing pH and O 2 concentrations to decrease at the CCA surface. At all flowvelocities the CBL thicknesses (up to 68 mm) were much greater than those previously published, indicating thatthe presence of canopies can alter the CBL substantially. In situ, the height of macroalgal canopies can be anorder of magnitude larger than those used here, indicating that the degree of buffering to OA will be contextdependent. Article in Journal/Newspaper Ocean acidification eCite UTAS (University of Tasmania) Limnology and Oceanography 58 1 121 130 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Environmental Sciences Ecological Applications Ecological Impacts of Climate Change |
spellingShingle |
Environmental Sciences Ecological Applications Ecological Impacts of Climate Change Cornwall, CE Hepburn, CD Pilditch, CA Hurd, CL Concentration boundary layers and complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae |
topic_facet |
Environmental Sciences Ecological Applications Ecological Impacts of Climate Change |
description |
Metabolic processes have the potential to modulate the effects of ocean acidification (OA) in nearshoremacroalgal 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 withinand immediately above their canopies. In a unidirectional flume, we tested the effect of water velocity (00.1 m s -1 ), bulk seawater pH (ambient pH 8.05, and pH 7.65), and irradiance (photosynthetically saturating lightand 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 to7.908.00 in the light. Although these manipulations were short term, this indicates a potential daytime bufferingcapacity that could alleviate the effects of OA. Photosynthetic activity also increased O 2 concentrations at thesurface of the CCA. However, this moderating capacity was flow dependent; the CBL thickness decreased froman 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 occurredin the dark, with respiration causing pH and O 2 concentrations to decrease at the CCA surface. At all flowvelocities the CBL thicknesses (up to 68 mm) were much greater than those previously published, indicating thatthe presence of canopies can alter the CBL substantially. In situ, the height of macroalgal canopies can be anorder of magnitude larger than those used here, indicating that the degree of buffering to OA will be contextdependent. |
format |
Article in Journal/Newspaper |
author |
Cornwall, CE Hepburn, CD Pilditch, CA Hurd, CL |
author_facet |
Cornwall, CE Hepburn, CD Pilditch, CA Hurd, CL |
author_sort |
Cornwall, CE |
title |
Concentration boundary layers and complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae |
title_short |
Concentration boundary layers and complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae |
title_full |
Concentration boundary layers and complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae |
title_fullStr |
Concentration boundary layers and complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae |
title_full_unstemmed |
Concentration boundary layers and complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae |
title_sort |
concentration boundary layers and complex assemblages of macroalgae: implications for the effects of ocean acidification on understory coralline algae |
publisher |
Amer Soc Limnology Oceanography |
publishDate |
2013 |
url |
https://doi.org/10.4319/lo.2013.58.1.0121 http://ecite.utas.edu.au/91461 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
http://ecite.utas.edu.au/91461/1/Cornwall et al 2013a.pdf http://dx.doi.org/10.4319/lo.2013.58.1.0121 Cornwall, CE and Hepburn, CD and Pilditch, CA and Hurd, CL, Concentration boundary layers and complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algae, Limnology and Oceanography, 58, (1) pp. 121-130. ISSN 0024-3590 (2013) [Refereed Article] http://ecite.utas.edu.au/91461 |
op_doi |
https://doi.org/10.4319/lo.2013.58.1.0121 |
container_title |
Limnology and Oceanography |
container_volume |
58 |
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1 |
container_start_page |
121 |
op_container_end_page |
130 |
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1766157681655021568 |