Azores Deep-sea Research — Dataset 10.1594/PANGAEA.966836

Tissue loss of the cold-water octocoral Dentomuricea aff. meteor during an ex-situ experiment simulating deep-sea mining sediment plumes in the Azores

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Abstract

We report the results of an aquaria-based experiment testing the effects of simulated sediment plumes generated during mining activities for the extraction of ferromanganese nodules in the Clarion-Clipperton Fracture Zone (CCFZ), northeastern equatorial Pacific Ocean, and seafloor massive sulfides from a hydrothermal vent field in the Azores, northeast Atlantic, on the physiology of the cold-water octocoral Dentomuricea aff. meteor. Coral fragments were exposed to five experimental treatments for a period of four weeks at the DeepSeaLab aquaria facilities (Okeanos-University of the Azores): (1) suspended plumes of abyssal sediments from nodule fields at a concentration of 10 mg/l (2) suspended plumes of abyssal sediments from nodule fields at a concentration of 50 mg/l; (3) hydrothermal polymetallic sulphide particles at a concentration of 10 mg/l; (4) hydrothermal polymetallic sulphide particles at a concentration of 50 mg/l; and (5) a control treatment with no sediment addition. The surface area of the coral tissue lost during the experiment was quantified using photographs of the coral fragments and ImageJ software. Measurements were made every week for a period of 4 weeks.

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Sediment Coral Geology Oceanography Abyssal zone Abyssal plain Hydrothermal circulation Seafloor spreading Ferromanganese Seabed Ridge Period (music) Geochemistry Deep sea Water column Hydrothermal vent Bay Nodule (geology) Hydrostatic pressure Environmental science Total organic carbon Extraction (chemistry) Intertidal zone Dredging Pacific ocean Sapropel Cnidaria Mid-Atlantic Ridge Meteor (satellite) Coelenterata Mediterranean sea Aquatic science Mineralogy Hydrology (agriculture) Irish sea Sulfide Fracture (geology) Volcanogenic massive sulfide ore deposit Pollution Seawater

Tissue loss of the cold-water octocoral Dentomuricea aff. meteor during an ex-situ experiment simulating deep-sea mining sediment plumes in the Azores

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