Seawater carbonate chemistry and ecophysiology of brown macroalga Fucus vesiculosus L.
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2023
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| _version_ | 1867168222210424832 |
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| author | Takolander, Antti Cabeza, Mar Leskinen, Elina |
| author_facet | Takolander, Antti Cabeza, Mar Leskinen, Elina |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Stochastic upwelling of seawater in the Baltic Sea from the deep, anoxic bottoms may bring low-pH water rich in CO2 close to the surface. Such events may become more frequent with climate change and ongoing ocean acidification (OA). Photoautotrophs, such as macroalgae, which are important foundation species, have been proposed to benefit from increased carbon availability due to reduced energetic cost in carbon acquisition. However, the exact effects of CO2 fertilization may depend on the ambient light environment, as photosynthesis rates depend on available irradiance. In this experimental study, interacting effects of CO2 addition and irradiance on the habitat-forming macroalga Fucus vesiculosus were investigated during two seasons – winter and summer – in the northern Baltic Sea. Growth rates remained unaffected by CO2 or irradiance during both seasons, suggesting that direct effects of elevated CO2 on mature F. vesiculosus are small. Increases in CO2 affected algal elemental ratios by increasing carbon and decreasing nitrogen content, with resulting changes in the C:N ratio, but only in winter. In summer, chlorophyll a content increased under low irradiance. Increases in CO2 caused a decline in light-harvesting efficiency (decrease in Fv/Fm and α) under high irradiance in summer, and conversely increased α under low irradiance. High irradiance caused increases in the maximum relative electron transport rate (rETRmax) in summer, but not in winter. Differences between winter and summer indicate that F. vesiculosus responses to CO2 and irradiance are season-specific. Increases in carbon content during winter could indicate slightly positive effects of CO2 addition in the long run if the extra carbon gained may be capitalized in growth. The results of this study suggest that increases in CO2, either through upwelling or OA, may have positive effects on F. vesiculosus, but these effects are probably small. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_959648 |
| institution | PANGAEA |
| language | en |
| publishDate | 2023 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Seawater carbonate chemistry and ecophysiology of brown macroalga Fucus vesiculosus L. Takolander, Antti Cabeza, Mar Leskinen, Elina Alkalinity, total; Alkalinity, total, standard deviation; Ammonium; Ammonium, standard deviation; Aragonite saturation state; Baltic Sea; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbon, total; Carbon/Nitrogen ratio; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Chlorophyll a per unit wet mass; Chromista; Coast and continental shelf; Electron transport rate efficiency; Fucus vesiculosus; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Identification; Irradiance; Laboratory experiment; Light; Light saturation; Macroalgae; Maximal electron transport rate; Maximum photochemical quantum yield of photosystem II; Nitrate and Nitrite; Nitrate and Nitrite, standard deviation; Nitrogen, total; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Ochrophyta; ORDINAL NUMBER; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, NBS scale; pH, standard deviation; pH, total scale; Phosphate; Phosphate, standard deviation; Primary production/Photosynthesis; Salinity; Salinity, standard deviation; Sample ID; Season; Single species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Temperate; Temperature, water; Temperature, water, standard deviation; Treatment; Type of study Stochastic upwelling of seawater in the Baltic Sea from the deep, anoxic bottoms may bring low-pH water rich in CO2 close to the surface. Such events may become more frequent with climate change and ongoing ocean acidification (OA). Photoautotrophs, such as macroalgae, which are important foundation species, have been proposed to benefit from increased carbon availability due to reduced energetic cost in carbon acquisition. However, the exact effects of CO2 fertilization may depend on the ambient light environment, as photosynthesis rates depend on available irradiance. In this experimental study, interacting effects of CO2 addition and irradiance on the habitat-forming macroalga Fucus vesiculosus were investigated during two seasons – winter and summer – in the northern Baltic Sea. Growth rates remained unaffected by CO2 or irradiance during both seasons, suggesting that direct effects of elevated CO2 on mature F. vesiculosus are small. Increases in CO2 affected algal elemental ratios by increasing carbon and decreasing nitrogen content, with resulting changes in the C:N ratio, but only in winter. In summer, chlorophyll a content increased under low irradiance. Increases in CO2 caused a decline in light-harvesting efficiency (decrease in Fv/Fm and α) under high irradiance in summer, and conversely increased α under low irradiance. High irradiance caused increases in the maximum relative electron transport rate (rETRmax) in summer, but not in winter. Differences between winter and summer indicate that F. vesiculosus responses to CO2 and irradiance are season-specific. Increases in carbon content during winter could indicate slightly positive effects of CO2 addition in the long run if the extra carbon gained may be capitalized in growth. The results of this study suggest that increases in CO2, either through upwelling or OA, may have positive effects on F. vesiculosus, but these effects are probably small. |
| title | Seawater carbonate chemistry and ecophysiology of brown macroalga Fucus vesiculosus L. |
| topic | Alkalinity, total; Alkalinity, total, standard deviation; Ammonium; Ammonium, standard deviation; Aragonite saturation state; Baltic Sea; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbon, total; Carbon/Nitrogen ratio; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Chlorophyll a per unit wet mass; Chromista; Coast and continental shelf; Electron transport rate efficiency; Fucus vesiculosus; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Identification; Irradiance; Laboratory experiment; Light; Light saturation; Macroalgae; Maximal electron transport rate; Maximum photochemical quantum yield of photosystem II; Nitrate and Nitrite; Nitrate and Nitrite, standard deviation; Nitrogen, total; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Ochrophyta; ORDINAL NUMBER; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, NBS scale; pH, standard deviation; pH, total scale; Phosphate; Phosphate, standard deviation; Primary production/Photosynthesis; Salinity; Salinity, standard deviation; Sample ID; Season; Single species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Temperate; Temperature, water; Temperature, water, standard deviation; Treatment; Type of study |
| url | https://doi.org/10.1594/PANGAEA.959648 |