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| Main Authors: | , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2018
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.924886 |
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| _version_ | 1867171023324971008 |
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| author | Johnson, Maggie Dorothy Carpenter, Robert C |
| author_facet | Johnson, Maggie Dorothy Carpenter, Robert C |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Ocean acidification (OA) and nutrient enrichment threaten the persistence of near shore ecosystems, yet little is known about their combined effects on marine organisms. Here, we show that a threefold increase in nitrogen concentrations, simulating enrichment due to coastal eutrophication or consumer excretions, offset the direct negative effects of near-future OA on calcification and photophysiology of the reef-building crustose coralline alga, Porolithon onkodes. Projected near-future pCO2 levels (approx. 850 µatm) decreased calcification by 30% relative to ambient conditions. Conversely, nitrogen enrichment (nitrate + nitrite and ammonium) increased calcification by 90–130% in ambient and high pCO2 treatments, respectively. pCO2 and nitrogen enrichment interactively affected instantaneous photophysiology, with highest relative electron transport rates under high pCO2 and high nitrogen. Nitrogen enrichment alone increased concentrations of the photosynthetic pigments chlorophyll a, phycocyanin and phycoerythrin by approximately 80–450%, regardless of pCO2. These results demonstrate that nutrient enrichment can mediate direct organismal responses to OA. In natural systems, however, such direct benefits may be counteracted by simultaneous increases in negative indirect effects, such as heightened competition. Experiments exploring the effects of multiple stressors are increasingly becoming important for improving our ability to understand the ramifications of local and global change stressors in near shore ecosystems. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_924886 |
| institution | PANGAEA |
| language | en |
| publishDate | 2018 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Seawater carbonate chemistry and net calcification, relative electron transport rates and photosynthetic pigments of Porolithon onkodes Johnson, Maggie Dorothy Carpenter, Robert C Alkalinity, total; Alkalinity, total, standard error; Ammonium; Ammonium, standard error; Animalia; Aragonite saturation state; Benthic animals; Benthos; Bicarbonate ion; Calcification/Dissolution; Calcification rate; Calcite saturation state; Calcite saturation state, standard error; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chlorophyll a; Cnidaria; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Electron transport rate, relative; EXP; Experiment; Flow rate; Flow rate, standard error; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Identification; Irradiance; Irradiance, standard error; Laboratory experiment; Macro-nutrients; Moorea_north_shore; Nitrate and Nitrite; Nitrate and Nitrite, standard error; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; 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, standard error; pH, total scale; Phycocyanin; Phycoerythrin; Porolithon onkodes; Primary production/Photosynthesis; Registration number of species; Salinity; Salinity, standard error; Single species; South Pacific; Species; Temperature, water; Temperature, water, standard error; Treatment; Tropical; Type; Uniform resource locator/link to reference Ocean acidification (OA) and nutrient enrichment threaten the persistence of near shore ecosystems, yet little is known about their combined effects on marine organisms. Here, we show that a threefold increase in nitrogen concentrations, simulating enrichment due to coastal eutrophication or consumer excretions, offset the direct negative effects of near-future OA on calcification and photophysiology of the reef-building crustose coralline alga, Porolithon onkodes. Projected near-future pCO2 levels (approx. 850 µatm) decreased calcification by 30% relative to ambient conditions. Conversely, nitrogen enrichment (nitrate + nitrite and ammonium) increased calcification by 90–130% in ambient and high pCO2 treatments, respectively. pCO2 and nitrogen enrichment interactively affected instantaneous photophysiology, with highest relative electron transport rates under high pCO2 and high nitrogen. Nitrogen enrichment alone increased concentrations of the photosynthetic pigments chlorophyll a, phycocyanin and phycoerythrin by approximately 80–450%, regardless of pCO2. These results demonstrate that nutrient enrichment can mediate direct organismal responses to OA. In natural systems, however, such direct benefits may be counteracted by simultaneous increases in negative indirect effects, such as heightened competition. Experiments exploring the effects of multiple stressors are increasingly becoming important for improving our ability to understand the ramifications of local and global change stressors in near shore ecosystems. |
| title | Seawater carbonate chemistry and net calcification, relative electron transport rates and photosynthetic pigments of Porolithon onkodes |
| topic | Alkalinity, total; Alkalinity, total, standard error; Ammonium; Ammonium, standard error; Animalia; Aragonite saturation state; Benthic animals; Benthos; Bicarbonate ion; Calcification/Dissolution; Calcification rate; Calcite saturation state; Calcite saturation state, standard error; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chlorophyll a; Cnidaria; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Electron transport rate, relative; EXP; Experiment; Flow rate; Flow rate, standard error; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Identification; Irradiance; Irradiance, standard error; Laboratory experiment; Macro-nutrients; Moorea_north_shore; Nitrate and Nitrite; Nitrate and Nitrite, standard error; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; 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, standard error; pH, total scale; Phycocyanin; Phycoerythrin; Porolithon onkodes; Primary production/Photosynthesis; Registration number of species; Salinity; Salinity, standard error; Single species; South Pacific; Species; Temperature, water; Temperature, water, standard error; Treatment; Tropical; Type; Uniform resource locator/link to reference |
| url | https://doi.org/10.1594/PANGAEA.924886 |