Responses of three tropical seagrass species to CO2 enrichment ...

• Main Authors: Ow, Yan X, Collier, C J, Uthicke, Sven
• Format: Dataset
• Language: English
• Published: PANGAEA 2015
• Subjects: Benthos; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria <20 L; Charophyta; Coast and continental shelf; Cymodocea serrulata; Growth/Morphology; Halodule uninervis; Laboratory experiment; Plantae; Primary production/Photosynthesis; Respiration; Seagrass; Single species; South Pacific; Thalassia hemprichii; Tracheophyta; Tropical; Type; pH; Partial pressure of carbon dioxide water at sea surface temperature wet air; Temperature, water; Sample amount; Species; Registration number of species; Uniform resource locator/link to reference; Identification; Replicate; Respiration rate, oxygen; Net photosynthesis rate, oxygen; Photosynthetic efficiency; Irradiance; Light saturation; Maximum potential capacity of photosynthesis, oxygen; Gross photosynthesis/respiration ratio; Chlorophyll a; Chlorophyll b; Growth rate; Specific leaf area; Carbohydrates, solube, in tissue; Starch; Carbohydrates, non structural; Salinity; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard error; Alkalinity, total; Alkalinity, total, standard error; Ammonium; Ammonium, standard error; Phosphate; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.859062; https://doi.pangaea.de/10.1594/PANGAEA.859062

Increased atmospheric carbon dioxide leads to ocean acidification and carbon dioxide (CO2) enrichment of seawater. Given the important ecological functions of seagrass meadows, understanding their responses to CO2 will be critical for the management of coastal ecosystems. This study examined the physiological responses of three tropical seagrasses to a range of seawater pCO2 levels in a laboratory. Cymodocea serrulata, Halodule uninervis and Thalassia hemprichii were exposed to four different pCO2 treatments (442-1204 µatm) for 2 weeks, approximating the range of end-of-century emission scenarios. Photosynthetic responses were quantified using optode-based oxygen flux measurements. Across all three species, net productivity and energetic surplus (PG:R) significantly increased with a rise in pCO2 (linear models, P < 0.05). Photosynthesis-irradiance curve-derived photosynthetic parameters-maximum photosynthetic rates (P max) and efficiency (alpha) also increased as pCO2 increased (linear models, P < ... : 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 2016-03-18. ...