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Diurnal fluctuations in seawater pH influence the response of a calcifying macroalga to ocean acidification
Citation
Cornwall, CE and Hepburn, CD and McGraw, CM and Currie, KI and Pilditch, CA and Hunter, KA and Boyd, PW and Hurd, CL, Diurnal fluctuations in seawater pH influence the response of a calcifying macroalga to ocean acidification, Proceedings of the Royal Society B, 280 Article 20132201. ISSN 1471-2954 (2013) [Refereed Article]
Copyright Statement
Copyright 2013 The Author(s) Published by the Royal Society. All rights reserved
DOI: doi:10.1098/rspb.2013.2201
Abstract
Coastal 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 macro- alga, 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 d13C increased at lower mean pH. Including environmental hetero-
geneity in experimental design will assist with a more accurate assessment
of the responses of calcifiers to OA.
Item Details
Item Type: | Refereed Article |
---|---|
Keywords: | ocean acidification |
Research Division: | Environmental Sciences |
Research Group: | Climate change impacts and adaptation |
Research Field: | Ecological impacts of climate change and ecological adaptation |
Objective Division: | Environmental Policy, Climate Change and Natural Hazards |
Objective Group: | Adaptation to climate change |
Objective Field: | Ecosystem adaptation to climate change |
UTAS Author: | Cornwall, CE (Dr Chris Cornwall) |
UTAS Author: | Boyd, PW (Professor Philip Boyd) |
UTAS Author: | Hurd, CL (Professor Catriona Hurd) |
ID Code: | 89038 |
Year Published: | 2013 |
Web of Science® Times Cited: | 107 |
Deposited By: | IMAS Research and Education Centre |
Deposited On: | 2014-02-24 |
Last Modified: | 2014-06-12 |
Downloads: | 0 |
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