Publication Date:
2024-03-15
Description:
Ocean acidification is a growing threat to coral growth and the accretion of coral reef ecosystems. Corals inhabiting environments that already endure extreme diel pCO2 fluctuations, however, may represent acidification-resilient populations capable of persisting on future reefs. Here, we examined the impact of pCO2 variability on the reef-building coral Pocillopora damicornis originating from reefs with contrasting environmental histories (variable reef flat versus stable reef slope) following reciprocal exposure to stable (218 ± 9) or variable (911 ± 31) diel pCO2 amplitude (μtam) in aquaria over eight weeks. Endosymbiont density, photosynthesis and net calcification rates differed between origins but not treatment, whereas primary calcification (extension) was affected by both origin and acclimatization to novel pCO2 conditions. At the cellular level, corals from the variable reef flat exhibited less intracellular pH (pHi) acidosis and faster pHi recovery rates in response to experimental acidification stress (pH 7.40) than corals originating from the stable reef slope, suggesting environmental memory gained from lifelong exposure to pCO2 variability led to an improved ability to regulate acid–base homeostasis. These results highlight the role of cellular processes in maintaining acidification resilience and suggest that prior exposure to pCO2 variability may promote more acidification-resilient coral populations in a changing climate.
Keywords:
Alkalinity, total; Alkalinity, total, standard error; Animalia; Aragonite saturation state; Aragonite saturation state, standard error; Benthic animals; Benthos; Bicarbonate ion; Biomass/Abundance/Elemental composition; Calcification/Dissolution; Calcification rate; Calcification rate, standard deviation; Calcification rate, standard error; Calcite saturation state; Calcium carbonate; Calcium carbonate, standard deviation; Calcium carbonate, standard error; Calculated using seacarb; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chlorophyll a; Chlorophyll a, standard deviation; Chlorophyll a, standard error; Cnidaria; Coast and continental shelf; Containers and aquaria (20-1000 L or 〈 1 m**2); Density, standard deviation; EXP; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard deviation; Growth rate, standard error; Heron_Island_Research_Station; Laboratory experiment; Net photosynthesis rate, oxygen; Net photosynthesis rate, oxygen, standard error; Net photosynthesis rate, standard deviation; OA-ICC; Ocean Acidification International Coordination Centre; Origin; Other; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard error; pH; pH, standard error; Pocillopora damicornis; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Proteins, standard deviation; Proteins, standard error; Proteins per surface area; Ratio; Ratio, standard deviation; Ratio, standard error; Replicates; Respiration; Respiration rate, oxygen; Respiration rate, oxygen, standard deviation; Respiration rate, oxygen, standard error; Salinity; Single species; South Pacific; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Symbiont cell density; Symbiont cell density, standard error; Temperature, water; Temperature, water, standard error; Treatment; Tropical; Type
Type:
Dataset
Format:
text/tab-separated-values, 328 data points
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