Decreased light availability can amplify negative impacts of ocean acidification on calcifying coral reef organisms
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2015
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| _version_ | 1867170985081307136 |
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| author | Vogel, Nikolas Meyer, Friedrich Wilhelm Wild, Christian Uthicke, Sven |
| author_facet | Vogel, Nikolas Meyer, Friedrich Wilhelm Wild, Christian Uthicke, Sven |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Coral reef organisms are increasingly and simultaneously affected by global and local stressors such as ocean acidification (OA) and reduced light availability. However, knowledge of the interplay between OA and light availability is scarce. We exposed 2 calcifying coral reef species (the scleractinian coral Acropora millepora and the green alga Halimeda opuntia) to combinations of ambient and increased pCO2 (427 and 1073 µatm, respectively), and 2 light intensities (35 and 150 µmol photons/m**2/s) for 16 d. We evaluated the individual and combined effects of these 2 stressors on weight increase, calcification rates, O2 fluxes and chlorophyll a content for the species investigated. Weight increase of A. millepora was significantly reduced by OA (48%) and low light intensity (96%) compared to controls. While OA did not affect coral calcification in the light, it decreased calcification in the dark by 155%, leading to dissolution of the skeleton. H. opuntia weight increase was not affected by OA, but decreased (40%) at low light. OA did not affect algae calcification in the light, but decreased calcification in the dark by 164%, leading to dissolution. Low light significantly reduced gross photosynthesis (56 and 57%), net photosynthesis (62 and 60%) and respiration (43 and 48%) of A. millepora and H. opuntia, respectively. In contrast to A. millepora, H. opuntia significantly increased chlorophyll content by 15% over the course of the experiment. No interactive effects of OA and low light intensity were found on any response variable for either organism. However, A. millepora exhibited additive effects of OA and low light, while H. opuntia was only affected by low light. Thus, this study suggests that negative effects of low light and OA are additive on corals, which may have implications for management of river discharge into coastal coral reefs. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_846877 |
| institution | PANGAEA |
| language | en |
| publishDate | 2015 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Decreased light availability can amplify negative impacts of ocean acidification on calcifying coral reef organisms Vogel, Nikolas Meyer, Friedrich Wilhelm Wild, Christian Uthicke, Sven Acropora millepora; Alkalinity, total; Alkalinity, total, standard deviation; Animalia; Aragonite saturation state; Aragonite saturation state, standard deviation; Benthic animals; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (<20 L); Calcification/Dissolution; Calcification rate of calcium carbonate; Calcite saturation state; Calculated using CO2calc; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Chlorophyll a; Chlorophyta; Cnidaria; Coast and continental shelf; Event label; EXP; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gross photosynthesis rate, oxygen; Growth/Morphology; Growth rate; Halimeda opuntia; Identification; Irradiance; Laboratory experiment; Light; Macroalgae; Net photosynthesis rate, oxygen; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Orpheus_Island_OA; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelorus_Island; pH, NBS scale; pH, standard deviation; pH, total scale; Plantae; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Respiration; Respiration rate, oxygen; Salinity; Single species; South Pacific; Species; Temperature, water; Temperature, water, standard deviation; Treatment; Tropical Coral reef organisms are increasingly and simultaneously affected by global and local stressors such as ocean acidification (OA) and reduced light availability. However, knowledge of the interplay between OA and light availability is scarce. We exposed 2 calcifying coral reef species (the scleractinian coral Acropora millepora and the green alga Halimeda opuntia) to combinations of ambient and increased pCO2 (427 and 1073 µatm, respectively), and 2 light intensities (35 and 150 µmol photons/m**2/s) for 16 d. We evaluated the individual and combined effects of these 2 stressors on weight increase, calcification rates, O2 fluxes and chlorophyll a content for the species investigated. Weight increase of A. millepora was significantly reduced by OA (48%) and low light intensity (96%) compared to controls. While OA did not affect coral calcification in the light, it decreased calcification in the dark by 155%, leading to dissolution of the skeleton. H. opuntia weight increase was not affected by OA, but decreased (40%) at low light. OA did not affect algae calcification in the light, but decreased calcification in the dark by 164%, leading to dissolution. Low light significantly reduced gross photosynthesis (56 and 57%), net photosynthesis (62 and 60%) and respiration (43 and 48%) of A. millepora and H. opuntia, respectively. In contrast to A. millepora, H. opuntia significantly increased chlorophyll content by 15% over the course of the experiment. No interactive effects of OA and low light intensity were found on any response variable for either organism. However, A. millepora exhibited additive effects of OA and low light, while H. opuntia was only affected by low light. Thus, this study suggests that negative effects of low light and OA are additive on corals, which may have implications for management of river discharge into coastal coral reefs. |
| title | Decreased light availability can amplify negative impacts of ocean acidification on calcifying coral reef organisms |
| topic | Acropora millepora; Alkalinity, total; Alkalinity, total, standard deviation; Animalia; Aragonite saturation state; Aragonite saturation state, standard deviation; Benthic animals; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (<20 L); Calcification/Dissolution; Calcification rate of calcium carbonate; Calcite saturation state; Calculated using CO2calc; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Chlorophyll a; Chlorophyta; Cnidaria; Coast and continental shelf; Event label; EXP; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gross photosynthesis rate, oxygen; Growth/Morphology; Growth rate; Halimeda opuntia; Identification; Irradiance; Laboratory experiment; Light; Macroalgae; Net photosynthesis rate, oxygen; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Orpheus_Island_OA; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelorus_Island; pH, NBS scale; pH, standard deviation; pH, total scale; Plantae; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Respiration; Respiration rate, oxygen; Salinity; Single species; South Pacific; Species; Temperature, water; Temperature, water, standard deviation; Treatment; Tropical |
| url | https://doi.org/10.1594/PANGAEA.846877 |