Growth rates of the cold-water coral Desmophyllum dianthus during an ex-situ experiment in the Azores


We conducted a medium-term (4 months) multiple stressor experiment with the cold-water coral Desmophyllum dianthus under future environmental conditions (IPCC RCP 8.5 scenarios for 2100), and sediment plumes generated during the potential extraction of seafloor massive sulphides. The experiment followed a two-step approach, where during the first 3 months, corals were exposed to four different treatments combining predicted scenarios of ocean acidification (pCO2/pH) and food availability. Two levels of pCO2 conditions were considered: natural habitat present day conditions (~500 µatm, 720 m depth) and IPCC RCP8.5 scenario (1000 µatm; IPCC, 2019), corresponding to pHT values of 7.93 and 7.66, respectively. In addition, two food availability regimes were recreated: high frequency of feeding (food delivered twice a day / 7 days a week) and low frequency of feeding (food delivered every other day). There were six replicate 13 L aquaria per treatment (4 D. dianthus per aquaria) at a temperature of 10.5 ± 0.1 ºC. During the fourth month of the experiment, suspended polymetallic sulphide particles generated during potential mining activities were added to half of the aquaria under the climate change scenarios at a concentration of 10 mg/l, making 8 treatments in a fully crossed experimental design for the 3 factors tested (OA, food, mining particles). Growth rates were measured using the buoyant weighing technique (Jokiel et al. 1978), using a balance (Mettler-Toledo ME204T) with a precision of 0.1 mg. Corals were weighed twice during the experiment: 1-2 weeks after the start of the experiment and just before the second phase of the experiment with PMS addition, which corresponded to a time interval of 63-71 days.

Metadata Access
Creator Carreiro-Silva, Marina ORCID logo; Godinho, Antonio; Sire de Vilar, Anaïs ORCID logo; Arzeni, Beatriz; Edery, Gal-la; Caetano, Miguel ORCID logo; Raimundo, Joana ORCID logo; Martins, Ines ORCID logo
Publisher PANGAEA
Publication Year 2024
Funding Reference Fundação para a Ciência e Tecnologia Crossref Funder ID CCCIND/03346/2020 Stimulus of Scientific Employment; Fundação para a Ciência e Tecnologia Crossref Funder ID PTDC/CTA-AMB/7948/2020 DeepRisk; Horizon 2020 Crossref Funder ID 818123 Integrated Assessment of Atlantic Marine Ecosystems in Space and Time
Rights Creative Commons Attribution 4.0 International; Data access is restricted (moratorium, sensitive data, license constraints);
OpenAccess false
Resource Type Dataset
Format text/tab-separated-values
Size 1056 data points
Discipline Earth System Research
Spatial Coverage (-28.633W, 38.448S, -28.594E, 38.533N); Azores
Temporal Coverage Begin 2021-05-15T00:00:00Z
Temporal Coverage End 2022-06-21T00:00:00Z