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Lorenz, Andrea (2005): Properties of foraminifera from Denmark Strait. PANGAEA, https://doi.org/10.1594/PANGAEA.706910, Supplement to: Lorenz, A (2005): Variability of benthic foraminifera north and south of the Denmark Strait. PhD Thesis, Mathematisch-Naturwissenschaftliche Fakultät der Christian-Albrechts-Universität zu Kiel, Germany, 139 pp, urn:nbn:de:gbv:8-diss-16462

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Abstract:
The Denmark Strait is a key area for the exchange of water masses and functions as a deep-water gateway between the Nordic Seas and the North Atlantic. Thus it constitutes an important part of the global thermohaline circulation (THC). The gateway aperture is influenced by eustatically and isostatically controlled changes of the Denmark Strait sill and by alteration in density contrasts between the water masses in North and South. In order to determine the faunal exchange through the changing aperture, benthic foraminiferal assemblages were analysed. Eight surface sediment samples were taken along the East Greenland continental margin during the RV Polarstern cruise ARK-XVIII/1 in July 2002 by means of a multicorer and a box corer respectively. Faunal assemblages of living (stained) and dead benthic foraminifera north and south of the Denmark Strait (980-2564 m water depth) were compared with each other. Northern and southern stations exhibit clear differences in abundances, diversities, number of species, and species composition. Due to strong bottom currents and low carbonate dissolution rates, high abundances with predominating calcareous species of dead and evidently allochthonous foraminifera were recorded south of the sill. Rather low abundances of dead autochthonous foraminiferal assemblages, containing mainly agglutinated species, were found north of the sill because of weak bottom currents and high carbonate dissolution rates. Southern stations showed a large portion of epibenthic species living as suspension feeders. In contrast endobenthic species living as substrate feeders dominated northern stations, pointing to lateral advection of food particles in South and sedimentation of food particles in North. Morphomertic measurements were performed on the high abundant foraminifer Cibicidoides wuellerstorfi. In order to supplement the data of the surface sediment samples and obtain morphometric data of glacial specimens, two long sediment cores were investigated as well. These cores were taken during the RV Polarstern cruise ARK-XVIII/1 north of the Denmark Strait and the RV Poseidon cruise PO210/2 in August 1995 south of the sill. Northern glacial samples contained no C. wuellerstorfi. The morphometric investigations included counting of chambers within the last whorl, determination of the maximum test diameter, identification of the coiling direction, measurement of the proloculus (initial chamber) diameter, and weighing of individual tests. It was statistically significant that chamber numbers decreased form glacial over northern to southern stations. Maximum diameters, percentages of coiling direction, proloculus diameters, and weight of single tests showed no differences. Evidences of a faunal exchange over the sill lead to the conclusion that C. wuellerstorfi from both sides of the sill response to diverse environmental conditions and develop two different ecophenotyes rather than genotypes. For C. wuellerstorfi the Denmark Strait is more likely a migration passage than a barrier.
Coverage:
Median Latitude: 66.070526 * Median Longitude: -28.884105 * South-bound Latitude: 61.525800 * West-bound Longitude: -39.373800 * North-bound Latitude: 71.502600 * East-bound Longitude: -16.837200
Date/Time Start: 1995-08-18T00:00:00 * Date/Time End: 2002-07-08T13:44:00
Event(s):
GIK23519-5 * Latitude: 64.797333 * Longitude: -29.595833 * Date/Time: 1995-08-18T00:00:00 * Elevation: -1893.0 m * Recovery: 6.55 m * Location: Greenland Sea * Campaign: POS210/2 * Basis: Poseidon * Method/Device: Gravity corer (Kiel type) (SL)
PS62/002-3 * Latitude: 61.794700 * Longitude: -39.373800 * Date/Time: 2002-07-01T17:41:00 * Elevation: -1928.0 m * Recovery: 0.28 m * Location: Greenland Sea * Campaign: ARK-XVIII/1 (PS62) * Basis: Polarstern * Method/Device: Giant box corer (GKG) * Comment: 1 core section: 0-0.28 m
PS62/004-2 * Latitude: 61.525800 * Longitude: -38.123200 * Date/Time: 2002-07-02T07:42:00 * Elevation: -2564.0 m * Location: Greenland Sea * Campaign: ARK-XVIII/1 (PS62) * Basis: Polarstern * Method/Device: MultiCorer (MUC)
Size:
27 datasets

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Datasets listed in this publication series

  1. Lorenz, A; Spindler, M (2005): Distribution of dead foraminifers in surface sediment of the Denmark Strait. https://doi.org/10.1594/PANGAEA.323542
  2. Lorenz, A; Spindler, M (2005): Distribution of living foraminifers in surface sediments of the Denmark Strait. https://doi.org/10.1594/PANGAEA.323617
  3. Lorenz, A; Spindler, M (2005): Morphometry of Cibicidoides wuellerstorfi from sediment core GIK23519-5. https://doi.org/10.1594/PANGAEA.316060
  4. Lorenz, A; Spindler, M (2005): Properties of C. wuellerstorfi at sediment core GIK23519-5. https://doi.org/10.1594/PANGAEA.315965
  5. Lorenz, A; Spindler, M (2005): Properties of benthic foraminifera Cibicidoides wuellerstorfi from sediment core PS62/002-3. https://doi.org/10.1594/PANGAEA.316008
  6. Lorenz, A; Spindler, M (2005): Properties of benthic foraminifera Cibicidoides wuellerstorfi from sediment core PS62/004-2. https://doi.org/10.1594/PANGAEA.316018
  7. Lorenz, A; Spindler, M (2005): Properties of benthic foraminifera Cibicidoides wuellerstorfi from sediment core PS62/010-2. https://doi.org/10.1594/PANGAEA.316011
  8. Lorenz, A; Spindler, M (2005): Properties of benthic foraminifera Cibicidoides wuellerstorfi from sediment core PS62/012-2. https://doi.org/10.1594/PANGAEA.316012
  9. Lorenz, A; Spindler, M (2005): Properties of benthic foraminifera Cibicidoides wuellerstorfi from sediment core PS62/017-1. https://doi.org/10.1594/PANGAEA.316013
  10. Lorenz, A; Spindler, M (2005): Properties of benthic foraminifera Cibicidoides wuellerstorfi from sediment core PS62/020-1. https://doi.org/10.1594/PANGAEA.316014
  11. Lorenz, A; Spindler, M (2005): Properties of benthic foraminifera Cibicidoides wuellerstorfi from sediment core PS62/021-1. https://doi.org/10.1594/PANGAEA.316017
  12. Lorenz, A; Spindler, M (2005): Properties of proloculus data of sediment core PS62/002-3. https://doi.org/10.1594/PANGAEA.316066
  13. Lorenz, A; Spindler, M (2005): Properties of proloculus data of sediment core PS62/004-2. https://doi.org/10.1594/PANGAEA.316067
  14. Lorenz, A; Spindler, M (2005): Properties of proloculus data of sediment core PS62/010-2. https://doi.org/10.1594/PANGAEA.316061
  15. Lorenz, A; Spindler, M (2005): Properties of proloculus data of sediment core PS62/012-2. https://doi.org/10.1594/PANGAEA.316062
  16. Lorenz, A; Spindler, M (2005): Properties of proloculus data of sediment core PS62/017-1. https://doi.org/10.1594/PANGAEA.316063
  17. Lorenz, A; Spindler, M (2005): Properties of proloculus data of sediment core PS62/020-1. https://doi.org/10.1594/PANGAEA.316064
  18. Lorenz, A; Spindler, M (2005): Properties of proloculus data of sediment core PS62/021-1. https://doi.org/10.1594/PANGAEA.316065
  19. Lorenz, A; Spindler, M (2005): Sediment parameter of cores north from the Denmark Strait. https://doi.org/10.1594/PANGAEA.316116
  20. Lorenz, A; Spindler, M (2005): Weight of C. wuellerstorfi tests according to other properties at sediment core GIK23519-5. https://doi.org/10.1594/PANGAEA.315955
  21. Lorenz, A; Spindler, M (2005): Weight of C. wuellerstorfi tests according to other properties at sediment core PS62/002-3. https://doi.org/10.1594/PANGAEA.315956
  22. Lorenz, A; Spindler, M (2005): Weight of C. wuellerstorfi tests according to other properties at sediment core PS62/004-2. https://doi.org/10.1594/PANGAEA.315958
  23. Lorenz, A; Spindler, M (2005): Weight of C. wuellerstorfi tests according to other properties at sediment core PS62/010-2. https://doi.org/10.1594/PANGAEA.315959
  24. Lorenz, A; Spindler, M (2005): Weight of C. wuellerstorfi tests according to other properties at sediment core PS62/012-2. https://doi.org/10.1594/PANGAEA.315957
  25. Lorenz, A; Spindler, M (2005): Weight of C. wuellerstorfi tests according to other properties at sediment core PS62/017-1. https://doi.org/10.1594/PANGAEA.315960
  26. Lorenz, A; Spindler, M (2005): Weight of C. wuellerstorfi tests according to other properties at sediment core PS62/020-1. https://doi.org/10.1594/PANGAEA.315961
  27. Lorenz, A; Spindler, M (2005): Weight of C. wuellerstorfi tests according to other properties at sediment core PS62/021-1. https://doi.org/10.1594/PANGAEA.315962