Publication Date:
2024-03-15
Description:
Anthropogenic CO2 is causing warming and ocean acidification. Coral reefs are being severely impacted, yet confusion lingers regarding how reefs will respond to these stressors over this century. Since the 1982-1983 El Niño-Southern Oscillation warming event, the persistence of reefs around the Galápagos Islands has differed across an acidification gradient. Reefs disappeared where pH〈8.0 and aragonite saturation state (Omega arag)〈=3 and have not recovered, whereas one reef has persisted where pH〉8.0 and Omega arag〉3. Where upwelling is greatest, calcification by massive Porites is higher than predicted by a published relationship with temperature despite high CO2, possibly due to elevated nutrients. However, skeletal P/Ca, a proxy for phosphate exposure, negatively correlates with density (R=-0.822, p〈0.0001). We propose that elevated nutrients have the potential to exacerbate acidification by depressing coral skeletal densities and further increasing bioerosion already accelerated by low pH.
Keywords:
Alkalinity, total; Aragonite saturation state; Benthos; Bicarbonate ion; Biomass/Abundance/Elemental composition; Calcification/Dissolution; Calcification rate; Calcification rate, standard error; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Coulometric titration; Date/time end; Date/time start; Density; Density, standard error; DEPTH, water; Depth, water, standard error; Entire community; Extension rate; Extension rate, standard error; Field observation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Phosphorus/Calcium ratio; Phosphorus/Calcium ratio, standard error; Potentiometric titration; Replicates; Rocky-shore community; Salinity; Site; South Pacific; Table; Temperature; Temperature, water; Tropical
Type:
Dataset
Format:
text/tab-separated-values, 260 data points
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