Seawater carbonate chemistry and raw data of percent cover of benthic species obtained from field surveys

• Main Authors: Teixidó, Núria, Carlot, Jérémy, Alliouane, Samir, Ballesteros, Enric, De Vittor, Cinzia, Gambi, Maria Cristina, Gattuso, Jean-Pierre, Kroeker, Kristy J, Micheli, Fiorenza, Mirasole, Alice, Parravacini, Valeriano, Villéger, Sébastien
• Format: Dataset
• Language: English
• Published: PANGAEA 2024
• Subjects: a1a_amb; a1b_amb; a2a_amb; a2b_amb; a3a_amb; a3b_amb; a4a_amb; a4b_amb; Alkalinity; total; standard deviation; Aragonite saturation state; Benthos; Bicarbonate ion; Calcite saturation state; Calculated using seacarb; Calculated using seacarb after Nisumaa et al. (2010); Carbon; inorganic; dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; CO2 vent; Coast and continental shelf; Community composition and diversity; Condition; Coverage; Entire community; Event label; Field observation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Mediterranean Sea; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Ocean acidification
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.964979; https://doi.org/10.1594/PANGAEA.964979

Percent cover of 215 benthic species was quantified using two approaches with scuba diving: i) visual census techniques in Shallow Reef (benthic surveys were performed from 0.5 to 3 m depth) and Reef habitats (benthic surveys at ~10 m depth) dominated by algae and ii) photographic surveys in Caves (benthic surveys at ~3 m depth) and Deep Reef habitats (benthic surveys at ~ 40 m depth) dominated by sessile invertebrate animals. For visual censuses, 12 quadrats (25x25 cm) were haphazardly placed at Vent 1 and Vent 3 and the two corresponding ambient pH sites (n = 3 sites per habitat, n = 36 quadrats for Shallow Reefs and Reefs, respectively). For photographic surveys, 48–54 and 24 photoquadrats (25x25 cm) were taken at Vent 2 and Vent 4 and the two corresponding reference sites with ambient pH for each habitat (n = 3 sites per habitat, n = 144 photographic quadrats for Caves and n = 72 photographic quadrats for Deep Reefs, respectively). Both types of quadrats (visual censuses in the field and photographs in the lab) were divided into a grid of 25 squares (5 cm x 5 cm each). Percentage cover was quantified by counting the number of squares filled in the grid by the species and expressing the final values as relative percentages.