Flow and coral morphology control coral surface pH: Implications for the effects of ocean acidification
The future impact of ocean acidification (OA) on corals is disputed in part because mathematical models used to predict these impacts do not seem to capture, or offer a framework to adequately explain, the substantial variability in acidification effects observed in empirical studies. The build-up o...
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ftdoajarticles:oai:doaj.org/article:87888e78bb9943d081c93e899409e6eb 2023-05-15T17:49:48+02:00 Flow and coral morphology control coral surface pH: Implications for the effects of ocean acidification Neil C. S. Chan Daniel eWangpraseurt Michael eKühl Sean eConnolly 2016-02-01T00:00:00Z https://doi.org/10.3389/fmars.2016.00010 https://doaj.org/article/87888e78bb9943d081c93e899409e6eb EN eng Frontiers Media S.A. http://journal.frontiersin.org/Journal/10.3389/fmars.2016.00010/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2016.00010 https://doaj.org/article/87888e78bb9943d081c93e899409e6eb Frontiers in Marine Science, Vol 3 (2016) Climate Change pH ocean acidification CO2 coral reefs Coral calcification Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2016 ftdoajarticles https://doi.org/10.3389/fmars.2016.00010 2022-12-31T06:22:34Z The future impact of ocean acidification (OA) on corals is disputed in part because mathematical models used to predict these impacts do not seem to capture, or offer a framework to adequately explain, the substantial variability in acidification effects observed in empirical studies. The build-up of a diffusive boundary layer (DBL), wherein solute transport is controlled by diffusion, can lead to pronounced differences between the bulk seawater pH, and the actual pH experienced by the organism, a factor rarely considered in mathematical modelling of ocean acidification effects on corals. In the present study, we developed a simple diffusion-reaction-uptake model that was experimentally parameterized based on direct microsensor measurements of coral tissue pH and O2 within the DBL of a branching and a massive coral. The model accurately predicts tissue surface pH for different coral morphologies and under different flow velocities as a function of ambient pH. We show that, for all cases, tissue surface pH is elevated at lower flows, and thus thicker DBLs. The relative effects of OA on coral surface pH was controlled by flow and we show that under low flow velocities tissue surface pH under OA conditions (pHSWS = 7.8) can be equal to the pH under normal conditions (pHSWS = 8.2). We conclude that OA effects on corals in nature will be complex as the degree to which they are controlled by flow appears to be species specific. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 3 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Climate Change pH ocean acidification CO2 coral reefs Coral calcification Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
Climate Change pH ocean acidification CO2 coral reefs Coral calcification Science Q General. Including nature conservation geographical distribution QH1-199.5 Neil C. S. Chan Daniel eWangpraseurt Michael eKühl Sean eConnolly Flow and coral morphology control coral surface pH: Implications for the effects of ocean acidification |
topic_facet |
Climate Change pH ocean acidification CO2 coral reefs Coral calcification Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
The future impact of ocean acidification (OA) on corals is disputed in part because mathematical models used to predict these impacts do not seem to capture, or offer a framework to adequately explain, the substantial variability in acidification effects observed in empirical studies. The build-up of a diffusive boundary layer (DBL), wherein solute transport is controlled by diffusion, can lead to pronounced differences between the bulk seawater pH, and the actual pH experienced by the organism, a factor rarely considered in mathematical modelling of ocean acidification effects on corals. In the present study, we developed a simple diffusion-reaction-uptake model that was experimentally parameterized based on direct microsensor measurements of coral tissue pH and O2 within the DBL of a branching and a massive coral. The model accurately predicts tissue surface pH for different coral morphologies and under different flow velocities as a function of ambient pH. We show that, for all cases, tissue surface pH is elevated at lower flows, and thus thicker DBLs. The relative effects of OA on coral surface pH was controlled by flow and we show that under low flow velocities tissue surface pH under OA conditions (pHSWS = 7.8) can be equal to the pH under normal conditions (pHSWS = 8.2). We conclude that OA effects on corals in nature will be complex as the degree to which they are controlled by flow appears to be species specific. |
format |
Article in Journal/Newspaper |
author |
Neil C. S. Chan Daniel eWangpraseurt Michael eKühl Sean eConnolly |
author_facet |
Neil C. S. Chan Daniel eWangpraseurt Michael eKühl Sean eConnolly |
author_sort |
Neil C. S. Chan |
title |
Flow and coral morphology control coral surface pH: Implications for the effects of ocean acidification |
title_short |
Flow and coral morphology control coral surface pH: Implications for the effects of ocean acidification |
title_full |
Flow and coral morphology control coral surface pH: Implications for the effects of ocean acidification |
title_fullStr |
Flow and coral morphology control coral surface pH: Implications for the effects of ocean acidification |
title_full_unstemmed |
Flow and coral morphology control coral surface pH: Implications for the effects of ocean acidification |
title_sort |
flow and coral morphology control coral surface ph: implications for the effects of ocean acidification |
publisher |
Frontiers Media S.A. |
publishDate |
2016 |
url |
https://doi.org/10.3389/fmars.2016.00010 https://doaj.org/article/87888e78bb9943d081c93e899409e6eb |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Frontiers in Marine Science, Vol 3 (2016) |
op_relation |
http://journal.frontiersin.org/Journal/10.3389/fmars.2016.00010/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2016.00010 https://doaj.org/article/87888e78bb9943d081c93e899409e6eb |
op_doi |
https://doi.org/10.3389/fmars.2016.00010 |
container_title |
Frontiers in Marine Science |
container_volume |
3 |
_version_ |
1766156261944983552 |