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  • GEOMAR Catalogue / E-Books  (2)
  • Data  (22)
  • 2005-2009  (17)
  • 2000-2004  (7)
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  • 1
    In: Faszination Meeresforschung, Bremen : Hauschild, 2006, (2006), Seite 414-417, 3897573105
    In: 9783897573109
    In: year:2006
    In: pages:414-417
    Type of Medium: Article
    Language: German
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  • 2
    Keywords: Hochschulschrift ; Aufsatzsammlung ; Arktis ; Baltikum Nord ; Packeis ; Ökosystem
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (286 Seiten = 16 MB) , Illustrationen, Graphen, Karten
    Edition: Online-Ausgabe
    DDC: 577.73202
    Language: English
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  • 3
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    PANGAEA
    In:  Supplement to: Werner, Iris; Ikävalko, Johanna; Schünemann, Henrike (2007): Sea-ice algae in Arctic pack ice during late winter. Polar Biology, 30(11), 1493-1504, https://doi.org/10.1007/s00300-007-0310-2
    Publication Date: 2023-10-28
    Description: Pack ice around Svalbard was sampled during the expedition ARK XIX/1 of RV "Polarstern" (March-April 2003) in order to determine environmental conditions, species composition and abundances of sea-ice algae and heterotrophic protists during late winter. As compared to other seasons, species diversity of algae (total 40 taxa) was not low, but abundances (5,000-448,000 cells/l) were lower by one to two orders of magnitude. Layers of high algal abundances were observed both at the bottom and in the ice interior. Inorganic nutrient concentrations (NO2, NO3, PO4, Si(OH)4) within the ice were mostly higher than during other seasons, and enriched compared to seawater by enrichment indices of 1.6-24.6 (corrected for losses through the desalination process). Thus, the survival of algae in Arctic pack ice was not limited by nutrients at the beginning of the productive season. Based on less-detailed physical data, light was considered as the most probable factor controlling the onset of the spring ice-algal bloom in the lower part of the ice, while low temperatures and salinities inhibit algal growth in the upper part of the ice at the end of the winter. Incorporation of ice algae probably took place during the entire freezing period. Possible overwintering strategies during the dark period, such as facultative heterotrophy, energy reserves, and resting spores are discussed.
    Keywords: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; SPP1158
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
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    PANGAEA
    In:  Supplement to: Werner, Iris; Auel, Holger (2007): Environmental conditions and overwintering strategies of planktonic metazoans in and below coastal fast ice in the Gulf of Finland (Baltic Sea). Sarsia, 89(2), 102-116, https://doi.org/10.1080/00364820410003504
    Publication Date: 2023-10-28
    Description: A field study was conducted in Santala Bay with weekly samplings during February and March 2000. Ice thickness was 20-28 cm, snow cover 0-1 cm. The under‐ice water column was stratified with a cold (-0.3 - 0.2°C) and less saline (S = 2.1-4.9) interface layer. Concentrations of particulate organic carbon (0.5–5.8 mg POC/l) and algal pigments (0.3-18.2 µg chlorophyll a/l) were higher in the ice than in the water (0.2-0.5 mg POC/l, 1.6–7.1 µg chlorophyll a/l) and peaked mostly in the bottom part of the ice. The thin ice and almost lacking snow cover had favoured an early ice‐algal and phytoplankton bloom. The diversity of metazoans was low, with six species in the ice and eight species in the under‐ice water. The rotifer Synchaeta cf. littoralis dominated both in ice and water, with maximum abundances of 230 individuals/l in the bottom part of the ice. Rotifer eggs were also observed in the ice. Baltic sea ice seems to be a suitable habitat for rotifers. Nauplii and copepodids of the calanoid Acartia longiremis in the under‐ice water showed some herbivorous feeding (〈0.1-0.23 ng gut pigment/individual), but analysis of fatty acids, fatty alcohols and biomarker ratios indicated a more omnivorous/carnivorous diet. Despite low temperatures, this copepod showed growth and development below the ice, doubling in numbers (mainly CI, CII) from 118 to 230 individuals m during the third week of March.
    Keywords: Finland; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; Santala; SEAICEC; Sea ice corer; SPP1158
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 5
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    PANGAEA
    In:  Supplement to: Werner, Iris (2005): Living conditions, abundance and biomass of under-ice fauna in the Storfjord area (western Barents Sea, Arctic) in late winter (March 2003). Polar Biology, 28(4), 311-318, https://doi.org/10.1007/s00300-004-0678-1
    Publication Date: 2023-10-28
    Description: The under-ice habitat and fauna were studied during a typical winter situation at three stations in the western Barents Sea. Dense pack ice (7-10/10) prevailed and ice thickness ranged over 〈0.1-1.6 m covered by 〈0.1-0.6 m of snow. Air temperatures ranged between -1.8 and -27.5°C. The ice undersides were level, white and smooth. Temperature and salinity profiles in the under-ice water (0-5 m depth) were not stratified (T=-1.9 to -2.0°C and S=34.2-34.7). Concentrations of inorganic nutrients were high and concentrations of algal pigments were very low (0.02 µg chlorophyll a/l), indicating the state of biological winter. Contents of particulate organic carbon and nitrogen ranged over 84.2-241.3 and 5.3-16.4 µg/l, respectively, the C/N ratio over 11.2-15.5 pointing to the dominance of detritus in the under-ice water. Abundances of amphipods at the ice underside were lower than in other seasons: 0-1.8 ind/m**2 for Apherusa glacialis, 0-0.7 ind/m**2 for Onisimus spp., and 0-0.8 ind/m**2 for Gammarus wilkitzkii. A total of 22 metazoan taxa were found in the under-ice water, with copepods as the most diverse and numerous group. Total abundances ranged over 181-2,487 ind/m**3 (biomass: 70-2,439 µg C/m**3), showing lower values than in spring, summer and autumn. The dominant species was the calanoid copepod Pseudocalanus minutus (34-1,485 ind/m**3), contributing 19-65% to total abundances, followed by copepod nauplii (85-548 ind/m**3) and the cyclopoid copepod Oithona similis (44-262 ind/m**3). Sympagic (ice-associated) organisms occurred only rarely in the under-ice water layer.
    Keywords: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; SPP1158
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 6
    Publication Date: 2024-04-24
    Keywords: 9,12-Hexadecadienoic acid of total fatty acids; all-cis-11,14-Eicosadienoic acid of total fatty acids; all-cis-4,7,10,13,16,19-Docosahexaenoic acid of total fatty acids; all-cis-5,8,11,14,17-Eicosapentaenoic acid of total fatty acids; all-cis-5,8,11,14-Eicosatetraenoic acid of total fatty acids; all-cis-6,9,12,15-Octadecatetraenoic acid of total fatty acids; all-cis-6,9,12-Octadecatrienoic acid of total fatty acids; all-cis-7,10,13,16,19-Docosapentaenoic acid of total fatty acids; all-cis-9,12,15-Octadecatrienoic acid of total fatty acids; all-cis-9,12-Octadecadienoic acid of total fatty acids; cis-11-Icosenoic acid of total fatty acids; cis-11-Octadecenoic acid of total fatty acids (IUPAC: Octadec-11-enoic acid); cis-9-Hexadecenoic acid of total fatty acids (IUPAC: (9Z)-hexadec-9-enoic acid); cis-9-Octadecenoic acid of total fatty acids (IUPAC: Octadec-9-enoic acid); DATE/TIME; Docosenol of total fatty alcohols; Eicosenol of total fatty alcohols; Fatty acids, standard deviation; Fatty alcohols, standard deviation; Finland; Hexadecanoic acid of total fatty acids; Hexadecanol of total fatty alcohols; Number; Octadecanoic acid of total fatty acids; Octadecanol of total fatty alcohols; Pentadecanoic acid of total fatty acids; Ratio; Santala; SEAICEC; Sea ice corer; Species; Stage; Tetracosenoic acid 24:1(n-11) of total fatty acids; Tetradecanoic acid of total fatty acids; Tetradecanol of total alcohols
    Type: Dataset
    Format: text/tab-separated-values, 414 data points
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  • 7
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    PANGAEA
    In:  Supplement to: Krapp, Rupert H; Berge, Jørgen; Flores, Hauke; Gulliksen, Bjørn; Werner, Iris (2008): Sympagic occurrence of Eusirid and Lysianassoid amphipods under Antarctic pack ice. Deep Sea Research Part II: Topical Studies in Oceanography, 55(8-9), 1015-1023, https://doi.org/10.1016/j.dsr2.2007.12.018
    Publication Date: 2024-06-25
    Description: During three Antarctic expeditions (2004, ANT XXI-4 and XXII-2; 2006, ANT XXIII-6) with the German research icebreaker R/V Polarstern, six different amphipod species were recorded under the pack ice of the Weddell Sea and the Lazarev Sea. These cruises covered Austral autumn (April), summer (December) and winter (August) situations, respectively. Five of the amphipod species recorded here belong to the family Eusiridae (Eusirus antarcticus, E. laticarpus, E. microps, E. perdentatus and E. tridentatus), while the last belongs to the Lysianassidea, genus Cheirimedon (cf. femoratus). Sampling was performed by a specially designed under-ice trawl in the Lazarev Sea, whereas in the Weddell Sea sampling was done by scuba divers and deployment of baited traps. In the Weddell Sea, individuals of E. antarcticus and E. tridentatus were repeatedly observed in situ during under-ice dives, and single individuals were even found in the infiltration layer. Also in aquarium observations, individuals of E. antarcticus and E. tridentatus attached themselves readily to sea ice. Feeding experiments on E. antarcticus and E. tridentatus indicated a carnivorous diet. Individuals of the Lysianassoid Cheirimedon were only collected in baited traps there. Repeated conventional zooplankton hauls performed in parallel to this study did not record any of these amphipods from the water column. In the Lazarev Sea, E. microps, E. perdentatus and E. laticarpus were regularly found in under-ice trawls. We discuss the origin and possible sympagic life style of these amphipods.
    Keywords: ANT-XXI/4; ANT-XXII/2; ANT-XXII/2_drift-04; ANT-XXII/2_drift-06; ANT-XXII/2_drift-14; ANT-XXII/2_drift-18; ANT-XXII/2_drift-21; ANT-XXII/2_drift-35; ANT-XXII/2_TRAPBP; ANT-XXIII/6; AWI; Cheirimedon cf. femoratus; Date/Time of event; ELEVATION; Elevation 2; Eusirus antarcticus; Eusirus laticarpus; Eusirus microps; Eusirus perdentatus; Eusirus tridentatus; Event label; ICE; Ice station; Ice thickness; LATITUDE; Latitude 2; LONGITUDE; Longitude 2; Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS65; PS65/625-1; PS67 ISPOL; PS69; PS69/486-6; PS69/488-4; PS69/494-1; PS69/498-47; PS69/498-48; PS69/509-8; PS69/512-1; PS69/516-9; PS69/518-10; SPP1158; SUIT; Surface and under ice trawl; Trap, baited; TRAPB; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 130 data points
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  • 8
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    PANGAEA
    In:  Supplement to: Kiko, Rainer; Werner, Iris; Wittmann, Astrid (2008): Osmotic and ionic regulation in response to salinity variations and cold resistance in the Arctic under-ice amphipod Apherusa glacialis. Polar Biology, 32(3), 393-398, https://doi.org/10.1007/s00300-008-0531-z
    Publication Date: 2024-06-25
    Description: Amphipods living at the underside of Arctic sea ice are exposed to varying salinities due to freezing and melting, and have to cope with the resulting osmotic stress. Extracellular osmotic and ionic regulation at different salinities, thermal hysteresis, and supercooling points (SCPs) were studied in the under-ice amphipod Apherusa glacialis. The species is euryhaline, capable to regulate hyperosmotically at salinities S(R) 〈 30 g/kg, and osmoconforms at salinities S(R) 〉= 30 g/kg. Hyperosmotic regulation is an adaptation to thrive in low-salinity meltwater below the ice. Conforming to the ambient salinity during freezing reduces the risk of internal ice formation. Thermal hysteresis was not observed in the haemolymph of A. glacialis. The SCP of the species was -7.8 ± 1.9°C. Several ions were specifically downregulated ([Mg2+], [SO4]2-), or upregulated ([K+], [Ca2+]) in comparison to the medium. Strong downregulation of [Mg2+], is probably necessary to avoid an anaesthetic effect at low temperatures.
    Keywords: Arctic Ocean; ARK-XXII/2; Calcium ion; Chloride ion; Experimental treatment; Haemolymph, calcium ion; Haemolymph, chloride ion; Haemolymph, magnesium ion; Haemolymph, potassium ion; Haemolymph, sodium ion; Haemolymph, sulfate ion; ICE; Ice station; Magnesium ion; Polarstern; Potassium ion; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS70/328-1; PS70 SPACE DAMOCLES; Sample type; Sodium ion; SPP1158; Sulfate ion; Sum
    Type: Dataset
    Format: text/tab-separated-values, 110 data points
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  • 9
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    PANGAEA
    In:  Supplement to: Kiko, Rainer; Michels, Jan; Mizdalski, Elke; Schnack-Schiel, Sigrid B; Werner, Iris (2008): Living conditions, abundance and composition of the metazoan fauna in surface and sub-ice layers in pack ice of the western Weddell Sea during late spring. Deep Sea Research Part II: Topical Studies in Oceanography, 55(8-9), 1000-1014, https://doi.org/10.1016/j.dsr2.2007.12.012
    Publication Date: 2024-06-25
    Description: The surface and sub-ice layer habitats and their metazoan fauna were studied on a drifting pack-ice floe in the western Weddell Sea from 29 November 2004 to 1 January 2005 during the "Ice Station POLarstern" (ISPOL). Flooding of the floe occurred at some places, and the establishment of surface layers with a brownish colour due to growing algae was observed at several sampling sites. The average surface-layer temperature, brine salinity and brine volume were -1.4 °C, 25.3 and 54%, respectively. The temperature-salinity relationship in the surface layer was seldom at equilibrium conditions. Chlorophyll a (Chl a) concentrations in the brine varied between 1.0 and 53.5 µg /L. Surface-layer thickness, salinity, Chl a concentration and copepod abundances were generally higher at the edge of the floe than in the inner part. The sympagic copepod species Drescheriella glacialis/racovitzai and Stephos longipes, with abundances ranging between 0 and 3830 ind/L (median: 2 ind/L) and 0 and 1293 ind/L (median: 4 ind/L), respectively, were the dominant members of the surface-layer meiofauna. Their populations consisted mainly of adults and early naupliar stages, which points to an active reproduction of these species within the surface layer. Other taxa found in the surface layer were undetermined turbellarians, the gastropod Tergipes antarcticus, and, for the first time, the ctenophore Callianira antarctica, and the amphipods Eusirus antarcticus and Eusirus tridentatus. During the course of our study, slight melting at the ice underside took place, releasing sympagic organisms to the water column. Chl a concentrations in the sub-ice water layer were very low (0.1-0.5 µg /L), except for 25 December when the Chl a concentration at 0 m depth increased to 2.3 µg /L. The most dominant sympagic copepod species found in the sub-ice layer was Ectinosoma sp., with abundances ranging between 1 and 599 ind/m**3 (median: 25 ind/m**3). Other sympagic copepod species occurring regularly in this habitat were D. glacialis/racovitzai, Diarthrodes cf. lilacinus, Idomene antarctica and S. longipes. All of these sympagic species were generally found in higher abundances at 0 m depth underneath the ice than at 5 m depth, in contrast to pelagic copepod species that occurred more frequently at 5 m depth. Niche separation and probable life-cycle strategies of dominant sympagic metazoans are discussed.
    Keywords: ANT-XXII/2; AWI; ICE; Ice station; Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS67/006-1; PS67 ISPOL; SPP1158; Weddell Sea
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 10
    Publication Date: 2024-06-25
    Keywords: ARK-X/1; ARK-X/1_ice_obs; ARK-XI/1; ARK-XI/1_ice_obs; ARK-XI/2; ARK-XI/2_ice_obs; DATE/TIME; Day of the year; East Siberian Sea; Estimated; Event label; Global Environmental Change: The Northern North Atlantic; Ice, sediment content; Ice coverage; Ice floe size; ICESUR; Ice survey; LATITUDE; LONGITUDE; Melt pond coverage on sea ice; Polarstern; PS31; PS36; PS37; Quaternary Environment of the Eurasian North; QUEEN; Ridges, sea ice; Sea ice thickness; SFB313
    Type: Dataset
    Format: text/tab-separated-values, 236 data points
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