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| Main Authors: | , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2023
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| Online Access: | https://doi.org/10.1594/PANGAEA.961060 |
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| _version_ | 1867168222943379456 |
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| author | Mason, Robert A B Wall, Christopher B Cunning, Ross Dove, Sophie Gates, Ruth D |
| author_facet | Mason, Robert A B Wall, Christopher B Cunning, Ross Dove, Sophie Gates, Ruth D |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The absorbtion of human-emitted CO2 by the oceans (elevated PCO2) is projected to alter the physiological performance of coral reef organisms by perturbing seawater chemistry (i.e. ocean acidification). Simultaneously, greenhouse gas emissions are driving ocean warming and changes in irradiance (through turbidity and cloud cover), which have the potential to influence the effects of ocean acidification on coral reefs. Here, we explored whether physiological impacts of elevated PCO2 on a coral–algal symbiosis (Pocillopora acuta–Symbiodiniaceae) are mediated by light and/or temperature levels. In a 39 day experiment, elevated PCO2 (962 versus 431 µatm PCO2) had an interactive effect with midday light availability (400 versus 800 µmol photons m−2 s−1) and temperature (25 versus 29°C) on areal gross and net photosynthesis, for which a decline at 29°C was ameliorated under simultaneous high-PCO2 and high-light conditions. Light-enhanced dark respiration increased under elevated PCO2 and/or elevated temperature. Symbiont to host cell ratio and chlorophyll a per symbiont increased at elevated temperature, whilst symbiont areal density decreased. The ability of moderately strong light in the presence of elevated PCO2 to alleviate the temperature-induced decrease in photosynthesis suggests that higher substrate availability facilitates a greater ability for photochemical quenching, partially offsetting the impacts of high temperature on the photosynthetic apparatus. Future environmental changes that result in moderate increases in light levels could therefore assist the P. acuta holobiont to cope with the 'one–two punch' of rising temperatures in the presence of an acidifying ocean. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_961060 |
| institution | PANGAEA |
| language | en |
| publishDate | 2023 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Seawater carbonate chemistry and the net photosynthesis， gross photosynthesis and respiration in Pocillopora acuta Mason, Robert A B Wall, Christopher B Cunning, Ross Dove, Sophie Gates, Ruth D Alkalinity, total; Animalia; Aragonite saturation state; Benthic animals; Benthos; Bicarbonate ion; Biomass/Abundance/Elemental composition; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell density; Chlorophyll a; Chlorophyll a per cell; Cnidaria; Coast and continental shelf; Colony number/ID; Containers and aquaria (20-1000 L or < 1 m**2); Coral; Date; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gross photosynthesis rate, oxygen; Identification; Laboratory experiment; Light; Net photosynthesis rate, oxygen; North Pacific; Number of cells; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Order; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, total scale; Pocillopora acuta; Primary production/Photosynthesis; Respiration; Respiration rate, oxygen; Salinity; Single species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Surface area; Temperature; Temperature, water; Treatment; Tropical; Type of study; Volume The absorbtion of human-emitted CO2 by the oceans (elevated PCO2) is projected to alter the physiological performance of coral reef organisms by perturbing seawater chemistry (i.e. ocean acidification). Simultaneously, greenhouse gas emissions are driving ocean warming and changes in irradiance (through turbidity and cloud cover), which have the potential to influence the effects of ocean acidification on coral reefs. Here, we explored whether physiological impacts of elevated PCO2 on a coral–algal symbiosis (Pocillopora acuta–Symbiodiniaceae) are mediated by light and/or temperature levels. In a 39 day experiment, elevated PCO2 (962 versus 431 µatm PCO2) had an interactive effect with midday light availability (400 versus 800 µmol photons m−2 s−1) and temperature (25 versus 29°C) on areal gross and net photosynthesis, for which a decline at 29°C was ameliorated under simultaneous high-PCO2 and high-light conditions. Light-enhanced dark respiration increased under elevated PCO2 and/or elevated temperature. Symbiont to host cell ratio and chlorophyll a per symbiont increased at elevated temperature, whilst symbiont areal density decreased. The ability of moderately strong light in the presence of elevated PCO2 to alleviate the temperature-induced decrease in photosynthesis suggests that higher substrate availability facilitates a greater ability for photochemical quenching, partially offsetting the impacts of high temperature on the photosynthetic apparatus. Future environmental changes that result in moderate increases in light levels could therefore assist the P. acuta holobiont to cope with the 'one–two punch' of rising temperatures in the presence of an acidifying ocean. |
| title | Seawater carbonate chemistry and the net photosynthesis， gross photosynthesis and respiration in Pocillopora acuta |
| topic | Alkalinity, total; Animalia; Aragonite saturation state; Benthic animals; Benthos; Bicarbonate ion; Biomass/Abundance/Elemental composition; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell density; Chlorophyll a; Chlorophyll a per cell; Cnidaria; Coast and continental shelf; Colony number/ID; Containers and aquaria (20-1000 L or < 1 m**2); Coral; Date; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gross photosynthesis rate, oxygen; Identification; Laboratory experiment; Light; Net photosynthesis rate, oxygen; North Pacific; Number of cells; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Order; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, total scale; Pocillopora acuta; Primary production/Photosynthesis; Respiration; Respiration rate, oxygen; Salinity; Single species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Surface area; Temperature; Temperature, water; Treatment; Tropical; Type of study; Volume |
| url | https://doi.org/10.1594/PANGAEA.961060 |