Seawater carbonate chemistry and total alkalinity incubation data, Oxygen evolution data and wet and buoyant weight measurements of macroalgae

• Main Authors: Bell, Lauren E, Gómez, J B, Donham, E M, Steller, Diana L, Gabrielson, P W, Kroeker, Kristy J
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: Alkalinity; total; standard deviation; standard error; Aragonite saturation state; Benthos; Bicarbonate ion; Bossiella orbigniana; Buoyant mass; Calcification/Dissolution; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon; inorganic; dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Comment; Containers and aquaria (20-1000 L or < 1 m**2); Crusticorallina adhaerens; Crusticorallina muricata; Crusticorallina painei; Date/time end; Date/time start; EXP; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Identification; Irradiance; Laboratory experiment; Light; Macroalgae; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Other; Oxygen evolution; Partial pressure of carbon dioxide; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pacific; Ocean acidification
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.944715; https://doi.org/10.1594/PANGAEA.944715

The emergent responses of vulnerable species to global change can vary depending on the relative quality of resources available to support their productivity under increased stress, as well as the biotic interactions with other species that may alter their access to these resources. This research tested how seawater pCO2 may interact with seasonal light availability to affect the photosynthesis and calcification of high-latitude coralline algae, and whether the responses of these calcified macroalgae are modified by physical association with a non-calcified seaweed. Through an in situ approach, our study first investigated how current seasonal environmental variation affects the growth of the understory coralline algae Crusticorallina spp. and Bossiella orbigniana in Southeast Alaska's kelp forests. We then experimentally manipulated pH to simulate end-of-century acidification scenarios, light regime to simulate seasonal light availability at the benthos, and pairings of coralline algal species with and without a fleshy red alga to examine the interactive effects of these variables on coralline productivity and calcification. Our results indicate that: 1) coralline species may face net dissolution under projected future winter pH and carbonate saturation state conditions, 2) differences in seasonal light availability in productive, high-latitude waters may not be distinct enough to modify coralline algal net calcification, and 3) association with a non-calcified red alga does not alter the response of these coralline algal species to ocean acidification scenarios. This research highlights the necessity of incorporating locally informed scenarios of environmental variability and community interactions when predicting species' vulnerability to global change.