Incorporating benthic community changes into hydrochemical-based projections of coral reef calcium carbonate production under ocean acidification

Shaw, Emily C., Hamylton, Sarah M. and Phinn, Stuart R. (2016) Incorporating benthic community changes into hydrochemical-based projections of coral reef calcium carbonate production under ocean acidification. Coral Reefs, 35 2: 739-750. doi:10.1007/s00338-016-1407-2


Author Shaw, Emily C.
Hamylton, Sarah M.
Phinn, Stuart R.
Title Incorporating benthic community changes into hydrochemical-based projections of coral reef calcium carbonate production under ocean acidification
Journal name Coral Reefs   Check publisher's open access policy
ISSN 0722-4028
1432-0975
Publication date 2016-06-01
Year available 2016
Sub-type Article (original research)
DOI 10.1007/s00338-016-1407-2
Open Access Status Not Open Access
Volume 35
Issue 2
Start page 739
End page 750
Total pages 12
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2017
Language eng
Formatted abstract
The existence of coral reefs is dependent on the production and maintenance of calcium carbonate (CaCO3) framework that is produced through calcification. The net production of CaCO3 will likely decline in the future, from both declining net calcification rates (decreasing calcification and increasing dissolution) and shifts in benthic community composition from calcifying organisms to non-calcifying organisms. Here, we present a framework for hydrochemical studies that allows both declining net calcification rates and changes in benthic community composition to be incorporated into projections of coral reef CaCO3 production. The framework involves upscaling net calcification rates for each benthic community type using mapped proportional cover of the benthic communities. This upscaling process was applied to the reef flats at One Tree and Lady Elliot reefs (Great Barrier Reef) and Shiraho Reef (Okinawa), and compared to existing data. Future CaCO3 budgets were projected for Lady Elliot Reef, predicting a decline of 53 % from the present value by end-century (800 ppm CO2) without any changes to benthic community composition. A further 5.7 % decline in net CaCO3 production is expected for each 10 % decline in calcifier cover, and net dissolution is predicted by end-century if calcifier cover drops below 18 % of the present extent. These results show the combined negative effect of both declining net calcification rates and changing benthic community composition on reefs and the importance of considering both processes for determining future reef CaCO3 production.
Keyword Calcium carbonate
Ocean acidification
Coral reefs
Calcification
Remote sensing
Pacific
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
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