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Schewe, Ingo; Soltwedel, Thomas (2003): Effects of varying food-availability on ecology and distribution of smallest benthic organisms in sediments of the arctic Fram Strait during POLARSTERN cruise ARK-XV/2. PANGAEA,, Supplement to: Schewe, I; Soltwedel, T (2003): Benthic response to ice-edge-induced particle flux in the Arctic Ocean. Polar Biology, 26(9), 610-620,

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With the aims of investigating the response of the smallest benthic biota to a strong ice-edge-related input of phytodetritus, and of registering supposed lateral transportation processes of phytodetrital matter with northerly direction under the ice, we analysed a number of abiotic and biotic parameters in surface sediments from the northern Fram Strait. Two transects of 14 stations in total were made. One transect, crossing the Fram Strait from the east to the west, followed mainly the ice edge. The second transect extended latitudinally in a northerly direction, starting in ice-free areas, passing the ice edge, and ending in heavy ice-covered areas, approximately 100 nm north of the ice edge. Stations along this transect were sampled at almost constant water depths to avoid depth-related influences in our investigations. Results showed the expected high phytodetritus concentrations in the ice-edge vicinity. Concentrations of sediment-bound plant pigments were approximately 5 times higher than in ice-covered areas, indicating a very strong phytodetritus input. With increasing distance from the highly productive areas at the ice edge, we found significantly decreasing concentrations of phytodetrital input to the seafloor in a northerly direction. Within the foraminiferans, generic diversity was clearly reduced in the area of strong phytodetritus deposition. Along the latitudinal transect, out of the direct ice-edge influence, foraminiferal diversities slowly increased within increasing distance from the ice edge. The integration of results from earlier foraminiferal investigations, from stations further to the north, indicates a once more decreasing diversity with continually decreasing food supply.
Median Latitude: 80.509922 * Median Longitude: 1.486825 * South-bound Latitude: 79.868333 * West-bound Longitude: -5.123333 * North-bound Latitude: 81.440667 * East-bound Longitude: 5.998333
Date/Time Start: 1999-07-27T00:32:00 * Date/Time End: 1999-08-31T04:21:00
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 0.045 m
PS55/077-3 * Latitude: 80.150000 * Longitude: 3.816667 * Date/Time: 1999-07-27T00:32:00 * Elevation: -1475.0 m * Recovery: 0.35 m * Location: Fram Strait * Campaign: ARK-XV/2 (PS55) * Basis: Polarstern * Device: MultiCorer (MUC)
PS55/079-3 * Latitude: 80.148333 * Longitude: 1.970000 * Date/Time: 1999-07-27T12:22:00 * Elevation: -2156.0 m * Location: Fram Strait * Campaign: ARK-XV/2 (PS55) * Basis: Polarstern * Device: MultiCorer (MUC) * Comment: MUC am Grund
PS55/080-3 * Latitude: 80.125000 * Longitude: 1.091667 * Date/Time: 1999-07-27T17:18:00 * Elevation: -2878.0 m * Location: Fram Strait * Campaign: ARK-XV/2 (PS55) * Basis: Polarstern * Device: MultiCorer (MUC) * Comment: MUC im Grund 2816 m
Depth, sediment = habitat depth
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepthmGeocode
6Chlorophyll aChl aµg/cm3Schewe, Ingo
7PhaeopigmentsPheopµg/cm3Schewe, Ingo
8PhospholipidsPhoslipnmol/mlSchewe, Ingo
9Adenylates, totalAdenylatespmol/cm3Schewe, Ingo
10Esterase activity per sediment volumeFDAnmol/ml/hSchewe, Ingo
11Meiofauna, abundanceMeiof#/10 cm2Schewe, Ingo
12NematodaNematoda#/m2Schewe, Ingo
13Meiofauna, abundance of harpacticoidaMeiof harpact ab#/m2Schewe, Ingo
14Meiofauna, abundance of metazoaMeiof metaz abund#/m2Schewe, Ingo
15Meiofauna, abundance of foraminiferaMeiof foram ab#/m2Schewe, Ingo
16Bacteria, abundanceBact abund109 #/cm3Schewe, Ingo
17Bacteria, biomass as carbonBact Cµg/cm3Schewe, Ingo
18Bacteria, heterotrophic, cell biovolumeHBA cell volµm3Schewe, Ingo
19PhospholipidsPhoslipnmol/mlSchewe, IngoPhotometry (Boetius & Lochte, 1994)
20Esterase activity per sediment volumeFDAnmol/ml/hSchewe, IngoIncubation
21Bacteria, abundanceBact abund109 #/cm3Schewe, IngoEpifluorescence microscopy (Boetius et al. 2000)
22Bacteria, biomass as carbonBact Cµg/cm3Schewe, IngoCarbon biomass estimation (unspec.)
800 data points

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