Seawater carbonate chemistry and biodiversity of coral reef cryptobiota ...

• Main Authors: Timmers, Molly A, Jury, Christopher P, Vicente, Jan, Bahr, Keisha D, Webb, M, Toonen, Robert J
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Benthos; Coast and continental shelf; Community composition and diversity; Containers and aquaria 20-1000 L or < 1 m**2; Entire community; Laboratory experiment; North Pacific; Rocky-shore community; Temperature; Tropical; Type; Treatment; Identification; Number of sequences; Operational taxonomic unit; Species richness; Phylum; Reads; Abundance; Proportion; Salinity; Salinity, standard deviation; Temperature, water; Temperature, water, standard deviation; pH; pH, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Partial pressure of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide, standard deviation; Aragonite saturation state; Aragonite saturation state, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Fugacity of carbon dioxide water at sea surface temperature wet air; Fugacity of carbon dioxide in seawater, standard deviation; Bicarbonate ion; Bicarbonate ion, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Calcite saturation state; Calcite saturation state, standard deviation; Spectrophotometric; Potentiometric titration; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. 2010; Calculated using seacarb after Orr et al. 2018; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.942812; https://doi.pangaea.de/10.1594/PANGAEA.942812

Ocean-warming and acidification are predicted to reduce coral reef biodiversity, but the combined effects of these stressors on overall biodiversity are largely unmeasured. Here, we examined the individual and combined effects of elevated temperature (+2 °C) and reduced pH (−0.2 units) on the biodiversity of coral reef communities that developed on standardized sampling units over a 2-y mesocosm experiment. Biodiversity and species composition were measured using amplicon sequencing libraries targeting the cytochrome oxidase I (COI) barcoding gene. Ocean-warming significantly increased species richness relative to present-day control conditions, whereas acidification significantly reduced richness. Contrary to expectations, species richness in the combined future ocean treatment with both warming and acidification was not significantly different from the present-day control treatment. Rather than the predicted collapse of biodiversity under the dual stressors, we find significant changes in the relative ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2021) 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 2022-03-30. ...