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dc.contributor.authorCornwall, Christopher E.
dc.contributor.authorHepburn, Christopher D.
dc.contributor.authorPilditch, Conrad A.
dc.contributor.authorHurd, Catriona L.
dc.date.accessioned2013-01-20T21:13:51Z
dc.date.available2013-01-20T21:13:51Z
dc.date.issued2012
dc.identifier.citationCornwall, 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.en_NZ
dc.identifier.issn0024-3590
dc.identifier.urihttps://hdl.handle.net/10289/7080
dc.description.abstractMetabolic 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.en_NZ
dc.language.isoen
dc.publisherAssociation for the Sciences of Limnology and Oceanographyen_NZ
dc.relation.urihttp://www.aslo.org/lo/en_NZ
dc.titleConcentration boundary layers around complex assemblages of macroalgae: Implications for the effects of ocean acidification on understory coralline algaeen_NZ
dc.typeJournal Articleen_NZ
dc.identifier.doi10.4319/lo.2013.58.1.0121en_NZ
dc.relation.isPartOfLimnology and Oceanographyen_NZ
pubs.begin-page121en_NZ
pubs.elements-id38110
pubs.end-page130en_NZ
pubs.issue1en_NZ
pubs.volume58en_NZ


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