Effects of in situ CO2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica ...

• Main Authors: Cox, T Erin, Gazeau, Frédéric, Alliouane, Samir, Hendriks, Iris, Mahacek, Paul, Le Fur, Arnaud, Gattuso, Jean-Pierre
• Format: Dataset
• Language: English
• Published: PANGAEA 2016
• Subjects: Benthos; Biomass/Abundance/Elemental composition; Coast and continental shelf; Field experiment; Growth/Morphology; Mediterranean Sea; Mesocosm or benthocosm; Peyssonnelia sp.; Plantae; Posidonia oceanica; Primary production/Photosynthesis; Respiration; Seagrass; Single species; Temperate; Tracheophyta; Type; Species; Registration number of species; Uniform resource locator/link to reference; Figure; Treatment; Shoot density; Shoot density, standard deviation; Color description; Date; Number; Month; Coverage; Coverage, standard deviation; Height; Height, standard deviation; Leaf length; Leaf length, standard deviation; Leaf density per shoot; Leaf area; Leaf area, standard deviation; Thickness; Thickness, standard deviation; Leaf toughness; Leaf toughness, standard deviation; Irradiance; Electron transport rate, relative; Electron transport rate, relative, standard deviation; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Initial slope of rapid light curve; Initial slope of rapid light curve, standard deviation; Maximal electron transport rate, relative; Maximal electron transport rate, relative, standard deviation; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.862529; https://doi.pangaea.de/10.1594/PANGAEA.862529

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 ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2015) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation is 2016-07-01. ...