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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2016
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| Online Access: | https://doi.org/10.1594/PANGAEA.862529 |
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| _version_ | 1867170991695724544 |
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| author | Cox, T Erin Gazeau, Frédéric Alliouane, Samir Hendriks, Iris Mahacek, Paul Le Fur, Arnaud Gattuso, Jean-Pierre |
| author_facet | Cox, T Erin Gazeau, Frédéric Alliouane, Samir Hendriks, Iris Mahacek, Paul Le Fur, Arnaud Gattuso, Jean-Pierre |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Seagrass is expected to benefit from increased carbon availability under future ocean acidification. This hypothesis has been little tested by in situ manipulation. To test for ocean acidification effects on seagrass meadows under controlled CO2/pH conditions, we used a Free Ocean Carbon Dioxide Enrichment (FOCE) system which allows for the manipulation of pH as continuous offset from ambient. It was deployed in a Posidonia oceanica meadow at 11 m depth in the Northwestern Mediterranean Sea. It consisted of two benthic enclosures, an experimental and a control unit both 1.7 m**3, and an additional reference plot in the ambient environment (2 m**2) to account for structural artifacts. The meadow was monitored from April to November 2014. The pH of the experimental enclosure was lowered by 0.26 pH units for the second half of the 8-month study. The greatest magnitude of change in P. oceanica leaf biometrics, photosynthesis, and leaf growth accompanied seasonal changes recorded in the environment and values were similar between the two enclosures. Leaf thickness may change in response to lower pH but this requires further testing. Results are congruent with other short-term and natural studies that have investigated the response of P. oceanica over a wide range of pH. They suggest any benefit from ocean acidification, over the next century (at a pH of 7.7 on the total scale), on Posidonia physiology and growth may be minimal and difficult to detect without increased replication or longer experimental duration. The limited stimulation, which did not surpass any enclosure or seasonal effect, casts doubts on speculations that elevated CO2 would confer resistance to thermal stress and increase the buffering capacity of meadows. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_862529 |
| institution | PANGAEA |
| language | en |
| publishDate | 2016 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Effects of in situ CO2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica Cox, T Erin Gazeau, Frédéric Alliouane, Samir Hendriks, Iris Mahacek, Paul Le Fur, Arnaud Gattuso, Jean-Pierre Alkalinity, total; Aragonite saturation state; Aragonite saturation state, standard deviation; Benthos; Bicarbonate ion; Biomass, wet mass, standard deviation; Biomass, wet mass per area; Biomass/Abundance/Elemental composition; Calcite saturation state; Calcite saturation state, standard deviation; Calculated using seacarb; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Color description; Compensation point; Compensation point, standard deviation; Coverage; Coverage, standard deviation; Date; Electron transport rate, relative; Electron transport rate, relative, standard deviation; EXP; Experiment; Field experiment; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Height; Height, standard deviation; Initial slope of rapid light curve; Initial slope of rapid light curve, standard deviation; Irradiance; Irradiance, standard deviation; Leaf area; Leaf area, standard deviation; Leaf density per shoot; Leaf length; Leaf length, standard deviation; Leaf production; Leaf production, standard deviation; Leaf toughness; Leaf toughness, standard deviation; Light saturation; Light saturation, standard deviation; Maximal electron transport rate, relative; Maximal electron transport rate, relative, standard deviation; Maximum gross photosynthesis rate, oxygen, per chlorophyll a; Maximum gross photosynthesis rate, oxygen, per chlorophyll a, standard deviation; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Median absolute deviation; Mediterranean Sea; Mesocosm or benthocosm; Month; Net oxygen, flux per chlorophyll a; Number; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Oxygen; Oxygen, flux, standard deviation; Oxygen, standard deviation; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Peyssonnelia sp.; pH, standard deviation; pH, total scale; pH change; Plantae; Plastochrone interval; Plastochrone interval, standard deviation; Posidonia oceanica; Potentiometric titration; Primary production/Photosynthesis; Registration number of species; Respiration; Respiration rate, oxygen, per chlorophyll a; Respiration rate, oxygen, standard deviation; Salinity; Salinity, standard deviation; Sample amount; Seagrass; Shoot density; Shoot density, standard deviation; Single species; Species; Spectrophotometric; Temperate; Temperature, water; Temperature, water, standard deviation; Thickness; Thickness, standard deviation; Time in days; Tracheophyta; Treatment; Type; Uniform resource locator/link to reference; Villefranche_eFOCE Seagrass is expected to benefit from increased carbon availability under future ocean acidification. This hypothesis has been little tested by in situ manipulation. To test for ocean acidification effects on seagrass meadows under controlled CO2/pH conditions, we used a Free Ocean Carbon Dioxide Enrichment (FOCE) system which allows for the manipulation of pH as continuous offset from ambient. It was deployed in a Posidonia oceanica meadow at 11 m depth in the Northwestern Mediterranean Sea. It consisted of two benthic enclosures, an experimental and a control unit both 1.7 m**3, and an additional reference plot in the ambient environment (2 m**2) to account for structural artifacts. The meadow was monitored from April to November 2014. The pH of the experimental enclosure was lowered by 0.26 pH units for the second half of the 8-month study. The greatest magnitude of change in P. oceanica leaf biometrics, photosynthesis, and leaf growth accompanied seasonal changes recorded in the environment and values were similar between the two enclosures. Leaf thickness may change in response to lower pH but this requires further testing. Results are congruent with other short-term and natural studies that have investigated the response of P. oceanica over a wide range of pH. They suggest any benefit from ocean acidification, over the next century (at a pH of 7.7 on the total scale), on Posidonia physiology and growth may be minimal and difficult to detect without increased replication or longer experimental duration. The limited stimulation, which did not surpass any enclosure or seasonal effect, casts doubts on speculations that elevated CO2 would confer resistance to thermal stress and increase the buffering capacity of meadows. |
| title | Effects of in situ CO2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica |
| topic | Alkalinity, total; Aragonite saturation state; Aragonite saturation state, standard deviation; Benthos; Bicarbonate ion; Biomass, wet mass, standard deviation; Biomass, wet mass per area; Biomass/Abundance/Elemental composition; Calcite saturation state; Calcite saturation state, standard deviation; Calculated using seacarb; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Color description; Compensation point; Compensation point, standard deviation; Coverage; Coverage, standard deviation; Date; Electron transport rate, relative; Electron transport rate, relative, standard deviation; EXP; Experiment; Field experiment; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Height; Height, standard deviation; Initial slope of rapid light curve; Initial slope of rapid light curve, standard deviation; Irradiance; Irradiance, standard deviation; Leaf area; Leaf area, standard deviation; Leaf density per shoot; Leaf length; Leaf length, standard deviation; Leaf production; Leaf production, standard deviation; Leaf toughness; Leaf toughness, standard deviation; Light saturation; Light saturation, standard deviation; Maximal electron transport rate, relative; Maximal electron transport rate, relative, standard deviation; Maximum gross photosynthesis rate, oxygen, per chlorophyll a; Maximum gross photosynthesis rate, oxygen, per chlorophyll a, standard deviation; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Median absolute deviation; Mediterranean Sea; Mesocosm or benthocosm; Month; Net oxygen, flux per chlorophyll a; Number; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Oxygen; Oxygen, flux, standard deviation; Oxygen, standard deviation; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Peyssonnelia sp.; pH, standard deviation; pH, total scale; pH change; Plantae; Plastochrone interval; Plastochrone interval, standard deviation; Posidonia oceanica; Potentiometric titration; Primary production/Photosynthesis; Registration number of species; Respiration; Respiration rate, oxygen, per chlorophyll a; Respiration rate, oxygen, standard deviation; Salinity; Salinity, standard deviation; Sample amount; Seagrass; Shoot density; Shoot density, standard deviation; Single species; Species; Spectrophotometric; Temperate; Temperature, water; Temperature, water, standard deviation; Thickness; Thickness, standard deviation; Time in days; Tracheophyta; Treatment; Type; Uniform resource locator/link to reference; Villefranche_eFOCE |
| url | https://doi.org/10.1594/PANGAEA.862529 |