Spatiotemporal drivers of hydrochemical ecosystem calcification and organic productivity: The meta-data

Date 2021-04-08
Temporal extent 1970-01-01 -2020-04-01
Author(s) Davis KayORCID1, Colefax AndrewORCID2, Tucker JamesORCID1, Kelaher BrendanORCID1, Santos Isaac3
Affiliation(s) 1 : National Marine Science Centre, School of Environment, Science and Engineering, Southern Cross University, PO Box 4321, Coffs Harbour, NSW 2450, Australia
2 : Sci-eye, PO Box 4202, Goonellabah, NSW 2480, Australia
3 : Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden
DOI 10.17882/80022
Publisher SEANOE
Keyword(s) alkalinity, bleaching, climate change, dissolved inorganic carbon, metabolism, ocean acidification, coral reef, meta analysis

Long-term coral reef resilience to multiple stressors depends on their ability to maintain positive calcification rates. Estimates of coral ecosystem calcification and organic productivity provide insight into the environmental drivers and temporal changes in reef condition. Here, we analyse global spatiotemporal trends and drivers of coral reef calcification using a meta-analysis of ecosystem-scale case studies. A linear mixed-effects regression model was used to test whether ecosystem-scale calcification is related to seasonality, methodology, calcifier cover, year, depth, wave action, latitude, duration of data collection, coral reef state, Ωar, temperature, and organic productivity. Global ecosystem calcification estimated from changes in seawater carbonate chemistry was driven primarily by depth and benthic calcifier cover. Current and future declines in coral cover will significantly affect the global reef carbonate budget, even before considering the effects of sub-lethal stressors on calcification rates. Repeatedly-studied reefs exhibited declining calcification of 4.3% ± 1.9% per year (1.8 ± 0.5 mmol m-2 d-1 yr-1), and increasing organic productivity at 3.0 ± 0.8 mmol m-2 d-1 per year since 1970. Therefore, coral reef ecosystems are experiencing a shift in their essential metabolic processes of calcification and photosynthesis and could become net dissolving worldwide around 2054.

Licence CC-BY
Utilisation Studies were excluded if diel-integrated Gnet rates, or the information necessary to calculate these, were not available, or if major external carbon sources such as river or groundwater inputs were documented at the time of sampling. Calculation of metabolic rates and auxiliary information occurred where sufficient information was given in the text, supporting information, or where original data was provided by the corresponding author (Supplementary Data 1). Studies were collected for analysis until April 2020. Seven studies were not included due to lack of data, with no response to our request for information from the corresponding author. Four studies were not included due to the invalidation of sampling methodology assumptions (i.e., the introduction of unaccounted for carbon into the system).
Acknowledgments We thank Drs Ashly McMahon, Emily Shaw, Tom DeCarlo and Steve Doo for supplying raw data for metabolic and auxiliary calculations. This project was supported by The Australian Research Council and the Australian Academy of Sciences.
File Size Format Processing Access
Meta-data used in the meta-analysis "Global coral reef ecosystems exhibit declining calcification and increasing primary productivity" 51 KB XLS, XLSX Processed data Open access
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How to cite 

Davis Kay, Colefax Andrew, Tucker James, Kelaher Brendan, Santos Isaac (2021). Spatiotemporal drivers of hydrochemical ecosystem calcification and organic productivity: The meta-data. SEANOE.

In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :

Davis, K. L., Colefax, A. P., Tucker, J. P., Kelaher, B. P., Santos, I. R. (2020). Global coral reef ecosystems exhibit declining calcification and increasing organic productivity. Nature Communications Earth and Environment. In Press.