Data Description

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Soltwedel, T et al. (2003): Sea-bed photographs (benthos) from the AWI-Hausgarten area along OFOS profile PS62/191-1. doi:10.1594/PANGAEA.227671,
Supplement to: Soltwedel, Thomas; von Juterzenka, Karen; Premke, Karin; Klages, Michael (2003): What a lucky shot ! Photographic evidence for a medium-sized natural food-fall at the deep seafloor (Heureuse surprise! Évidence photographique de la présence d'un cadavre d'animal nectonique de taille moyenne sur le plancher océanique). Oceanologica Acta, 26(5-6), 623-628, doi:10.1016/S0399-1784(03)00060-4
Although the use of deep-sea imagery considerably increased during the last decades, reports on nekton falls to the deep seafloor are very scarce. Whereas there are a few reports describing the finding of whale carcasses in the deep north-eastern and south-eastern Pacific, descriptions of invertebrate or vertebrate food-falls at centimetre to metre scale are extremely rare. After 4 years of extensive work at a deep-sea long-term station in northern polar regions (AWI-"Hausgarten"), including large-scale visual observations with various camera systems covering some 10 000 m2 of seafloor at water depths between 1250 and 5600 m, this paper describes the first observation of a fish carcass at about 1280 m water depth, west off Svålbard. The fish skeleton had a total length of 36 cm and an approximated biomass of 0.5 kg wet weight. On the basis of in situ experiments, we estimated a very short residence time of this particular carcass of about 7 h at the bottom. The fast response of the motile deep-sea scavenger community to such events and the rapid utilisation of this kind of organic carbon supply might partly explain the extreme rarity of such an observation.
Archive of Underwater Imaging (AUI) *
Median Latitude: 79.131000 * Median Longitude: 5.000000 * South-bound Latitude: 79.129000 * West-bound Longitude: 5.000000 * North-bound Latitude: 79.133000 * East-bound Longitude: 5.000000
Date/Time Start: 2002-08-10T00:00:00 * Date/Time End: 2002-08-10T20:39:00
Minimum Elevation: -1265.0 m * Maximum Elevation: -1265.0 m
PS62/191-1 * * Latitude Start: 79.133000 * Longitude Start: 5.000000 * Latitude End: 79.129000 * Longitude End: 5.000000 * Date/Time Start: 2002-08-10T20:39:00 * Date/Time End: 2002-08-10T00:00:00 * Elevation: -1265.0 m * Location: Fram Strait * * Campaign: ARK-XVIII/1 (PS62) * * Basis: Polarstern * * Device: Ocean Floor Observation System (OFOS) *
Cable-operated drifting camera frame Ocean Floor Observation system (OFOS). System details: Still camera 35 mm (Benthos), Kodak Ectachrome 100 Asa colour slide film, B/w video camera (DeepSea Power & Light), two flashes (600W/s), Distance of laser points: 0.5 m
Deployment details: Drift velocity: approx. 0.5 knots, Distance to seafloor: approx. 1.5 m

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