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dc.contributor.authorCornwall, Christopher E.
dc.contributor.authorHepburn, Christopher D.
dc.contributor.authorMcGraw, Christina M.
dc.contributor.authorCurrie, Kim I.
dc.contributor.authorPilditch, Conrad A.
dc.contributor.authorHunter, Keith A.
dc.contributor.authorBoyd, Philip W.
dc.contributor.authorHurd, Catriona L.
dc.identifier.citationCornwall, C. E., Hepburn, C. D., McGraw, C. M., Currie, K. I., Pilditch, C. A., …, Hurd, C. L. (2013). Diurnal fluctuations in seawater pH influence the response of a calcifying macroalga to ocean acidification. Proceedings of the Royal Society B: Biological Sciences, 280, no. 1772.en_NZ
dc.description.abstractCoastal ecosystems that are characterized by kelp forests encounter daily pH fluctuations, driven by photosynthesis and respiration, which are larger than pH changes owing to ocean acidification (OA) projected for surface ocean waters by 2100. We investigated whether mimicry of biologically mediated diurnal shifts in pH—based for the first time on pH time-series measurements within a kelp forest—would offset or amplify the negative effects of OA on calcifiers. In a 40-day laboratory experiment, the calcifying coralline macroalga, Arthrocardia corymbosa, was exposed to two mean pH treatments (8.05 or 7.65). For each mean, two experimental pH manipulations were applied. In one treatment, pH was held constant. In the second treatment, pH was manipulated around the mean (as a step-function), 0.4 pH units higher during daylight and 0.4 units lower during darkness to approximate diurnal fluctuations in a kelp forest. In all cases, growth rates were lower at a reduced mean pH, and fluctuations in pH acted additively to further reduce growth. Photosynthesis, recruitment and elemental composition did not change with pH, but δ¹³C increased at lower mean pH. Including environmental heterogeneity in experimental design will assist with a more accurate assessment of the responses of calcifiers to OA.en_NZ
dc.publisherRoyal Society Publishingen_NZ
dc.relation.ispartofProceedings of the Royal Society B: Biological Sciences
dc.subjectocean acidificationen_NZ
dc.subjectnatural pH fluctuationsen_NZ
dc.subjectcoralline macroalgaeen_NZ
dc.subjectenvironmental heterogeneityen_NZ
dc.subjecttemperate rocky reefsen_NZ
dc.titleDiurnal fluctuations in seawater pH influence the response of a calcifying macroalga to ocean acidificationen_NZ
dc.typeJournal Articleen_NZ
dc.relation.isPartOfProceedings of the Royal Society – Series B Biological Sciencesen_NZ

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