Seawater carbonate chemistry and growth of tropical marine macroalgae, supplement to: Ho, Maureen; Carpenter, Robert C (2017): Differential growth responses to water flow and reduced pH in tropical marine macroalgae. Journal of Experimental Marine Biology and Ecology, 491, 58-65

• Main Authors: Ho, Maureen, Carpenter, Robert C
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2017
• Subjects: Amansia rhodantha; Benthos; Chromista; Coast and continental shelf; Containers and aquaria 20-1000 L or < 1 m**2; Dictyota bartayresiana; Growth/Morphology; Laboratory experiment; Lobophora variegata; Macroalgae; Ochrophyta; Other; Rhodophyta; Single species; South Pacific; Tropical; Type; Species; Registration number of species; Uniform resource locator/link to reference; Treatment; Identification; Growth rate; Temperature, water; Salinity; pH; pH, standard error; 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; Alkalinity, total; Alkalinity, total, standard error; Bicarbonate ion; Bicarbonate ion, standard error; Carbon dioxide; Carbon dioxide, standard error; Carbonate system computation flag; Fugacity of carbon dioxide water at sea surface temperature wet air; Carbonate ion; Carbon, inorganic, dissolved; Aragonite saturation state; Calcite saturation state; Potentiometric; Calculated using seacarb; Potentiometric titration; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.908485; https://doi.pangaea.de/10.1594/PANGAEA.908485

The physical environment plays a key role in facilitating the transfer of nutrients and dissolved gases to marine organisms and can alter the rate of delivery of dissolved inorganic carbon. For non-calcifying macroalgae, water motion can influence the physiological and ecological responses to various environmental changes such as ocean acidification (OA). We tested the effects of lowered pH under three different flow speeds on three dominant non-calcifying macroalgal species differing in their carbon-use and are commonly found in the back reefs of Moorea, French Polynesia. Relative growth rates (RGR) of two phaeophytes, Dictyota bartayresiana and Lobophora variegata (HCO3− users), and a rhodophyte, Amansia rhodantha (CO2 user) were measured to examine how the combined effects of OA and flow can affect algal growth. Growth rates were affected independently by pCO2 and flow treatments but there was no significant interactive effect. Additionally, growth rates among species varied within the different flow regimes. Of the three species, L. variegata had the overall greatest increase in RGR across all three flow speeds while A. rhodantha exhibited the greatest negative impact under elevated pCO2 at 0.1 cm/s. These differential responses among algal species demonstrate the importance of flow when examining responses to a changing environment, and if the responses of macroalgae differ based on their carbon-use strategies, it may provide advantages to some macroalgal species in a future, more acidic ocean. : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2019) 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 by seacarb is 2019-11-08.