Please use this identifier to cite or link to this item:
|Scopus||Web of Science®||Altmetric|
|Title:||Dolomite-rich coralline algae in reefs resist dissolution in acidified conditions|
|Citation:||Nature Climate Change, 2013; 3(3):268-272|
|Publisher:||Nature Publishing Group|
|M. C. Nash, B. N. Opdyke, U. Troitzsch, B. D. Russell,W. H. Adey, A. Kato, G. Diaz-Pulido, C. Brent, M. Gardner, J. Prichard and D. I. Kline|
|Abstract:||Coral reef ecosystems develop best in high-flow environments but their fragile frameworks are also vulnerable to high wave energy. Wave-resistant algal rims, predominantly made up of the crustose coralline algae (CCA) Porolithon onkodes and P. pachydermum¹,², are therefore critical structural elements for the survival of many shallow coral reefs. Concerns are growing about the susceptibility of CCA to ocean acidification because CCA Mg-calcite skeletons are more susceptible to dissolution under low pH conditions than coral aragonite skeletons³. However, the recent discovery⁴ of dolomite (Mg₀.₅ Ca₀.₅ (CO₃)), a stable carbonate⁵, in P. onkodes cells necessitates a reappraisal of the impacts of ocean acidification on these CCA. Here we show, using a dissolution experiment, that dried dolomite-rich CCA have 6-10 times lower rates of dissolution than predominantly Mg-calcite CCA in both high-CO₂ (∼ 700 ppm) and control (∼ 380 ppm) environments, respectively. We reveal this stabilizing mechanism to be a combination of reduced porosity due to dolomite infilling and selective dissolution of other carbonate minerals. Physical break-up proceeds by dissolution of Mg-calcite walls until the dolomitized cell eventually drops out intact. Dolomite-rich CCA frameworks are common in shallow coral reefs globally and our results suggest that it is likely that they will continue to provide protection and stability for coral reef frameworks as CO₂ rises.|
|Rights:||© 2013 Macmillan Publishers Limited.|
|Appears in Collections:||Earth and Environmental Sciences publications|
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.