OFOS photographic survey transects characteristics, megabenthic communities characteristics, seafloor algae coverage and environmental conditions during POLARSTERN cruise PS80 (ARK-XXVII/3, IceArc) ...

• Main Authors: Rybakova, Elena, Kremenetskaia, Antonina, Vedenin, Andrey, Boetius, Antje, Gebruk, Andrey V
• Format: Dataset
• Language: English
• Published: PANGAEA 2018
• Subjects: Event label; Date/Time of event; Date/Time of event 2; Latitude of event; Latitude of event 2; Longitude of event; Longitude of event 2; Elevation of event; Elevation of event 2; Ice-station; Number of photos; Area; Length of transect; Megafauna abundance; Megafauna, standard deviation; Megafauna, biomass, wet mass; Algal cover; Ocean Floor Observation System; ARK-XXVII/3; Polarstern; amundsen basin; Nansen Basin
• Online Access: https://dx.doi.org/10.1594/pangaea.896626; https://doi.pangaea.de/10.1594/PANGAEA.896626

A photographic survey was carried out during the expedition ARK-XXVII/3 to the Nansen and Amundsen basins. The seafloor was photographed using a towed Ocean Floor Observation System (OFOS). Nine transects were performed: four in the Nansen Basin between 83-84°N and 18-110°E at depths 3571-4066 m, and five in the Amundsen Basin between 83-89°N and 56-131°E at depths 4041-4384 m. All images were analysed and stored using the image analysis program and database BIIGLE (www.BIIGLE.de). The laser points were used for calculation of the seafloor surface area on images. Visible megafauna was counted and identified to the lowest possible taxonomic level. The number of different taxa on each image was converted to individuals per m² (density). Total megafauna density (±standard deviation) was calculated for each transect. The mean taxa biomass per m² and the total megafauna biomass per m² were roughly estimated for each transect. The mean biomass (preserved wet weight) was calculated based on the wet weight of ...