Calcification and organic productivity at the world's southernmost coral reef

Davis, Kay L.; McMahon, Ashly; Correa, Rogger E.; Santos, Isaac R.

doi:10.1016/j.marchem.2020.103870

Cited by 7 publications

(8 citation statements)

References 89 publications

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“…The temperature effect on G net was scale-dependent. Although our model indicated no overarching influence of temperature on global G net rates, individual reefs had greater G net with higher water temperatures and in warmer seasons 20,71 (Figs. 2, 3).…”

Section: Discussionmentioning

confidence: 78%

“…However, wave heights or energy are challenging to measure and are rarely reported. Residence time could have a significant influence on G net at a local scale 37,78,83 , but is not a relevant factor in all methodologies 32 , is associated with large errors 16,20,84 , and is rarely reported in a unit pertinent to our study. Therefore, residence times were not included in our metaanalysis.…”

Section: Discussionmentioning

confidence: 84%

“…Although >50% of all coral reefs exist in the 0-15°l atitude range 47 , only 20% of ecosystem calcification estimates occurred in low-latitude reefs near the equator. Mid-latitude reefs (15-28°) represented 72% of studied reefs, whereas high-latitude reefs (28-32.5°N and S), which constitute only 1.5% of reefs globally, but are hotspots of change 20,48,49 , were the focus of 8% of ecosystem metabolism studies (Fig. 1, Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

“…G net is the net balance between calcification and dissolution, which quantifies the productivity of all calcifiers within an ecosystem. Changing rates of G net and P net can indicate growth 9 , degradation [16][17][18] or phase shifting 16,19,20 . Higher rates of G net tend to indicate reefs with higher coral cover 9,21,22 , and ecosystems which have not been impacted by significant stressors [23][24][25][26] , whereas declining and net-dissolving calcification rates indicate stressed corals 16,18,27 or ecosystems which have little to no live corals 25,28 .…”

mentioning

confidence: 99%

“…The percent change in G net is calculated as the warmer temperature G net divided by the cooler temperature G net . Because major local stress events or reef degradation can mask the temperature-G net relationship20 , data from reefs classified as degraded were not included. This prevents confounding effects of growing local-scale impacts on a global-scale interpretation.…”

mentioning

confidence: 99%

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Global coral reef ecosystems exhibit declining calcification and increasing primary productivity

Davis

Colefax²,

Tucker

et al. 2021

Commun Earth Environ

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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 (x̄ = 1.8 ± 0.7 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.

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Section: Discussionmentioning

confidence: 78%