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  • 2005-2009  (17)
Document type
Keywords
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Language
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Year
  • 1
    Article
    Article
    Wer schreibt,.... : das wissenschaftliche Manuskript (2006)
    Bremen : Hauschild
    Associated volumes
    Details Availability
    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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    GEOMAR CATALOGUE
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  • 2
    Online Resource
    Online Resource
    Seasonal dynamics, cryo-pelagic interactions, and metabolic rates of Arctic and Baltic pack-ice and under-ice fauna (2005)
    Kiel
    Details Availability
    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
    URL: https://oceanrep.geomar.de/id/eprint/59326/
    DDC: 577.73202
    Language: English
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  • 3
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    Sea-ice communities - life in a cool environment (2009)
    Wirtschaftsverlag NW
    In:  In: Biological studies in Polar Oceans - an expedition to the life in icy waters. , ed. by Hempel, G. Wirtschaftsverlag NW, Bremerhaven, pp. 55-61. ISBN 978-3-86509-865-8
    Details
    Publication Date: 2019-09-23
    Type: Book chapter , PeerReviewed
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    OceanRep: Book chapter
  • 4
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    Seasonal dynamics, cryo-pelagic interactions, and metabolic rates of Arctic and Baltic pack-ice and under-ice fauna (2005)
    Details
    Publication Date: 2023-11-07
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 5
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    Osmotic and ionic regulation in response to salinity variations and cold resistance in the Arctic under-ice amphipod Apherusa glacialis (2009)
    Springer
    In:  Polar Biology, 32 . pp. 393-398.
    Details
    Publication Date: 2019-07-31
    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.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00300-008-0531-z
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Sympagic occurrence of Eusirid and Lysianassoid amphipods under Antarctic pack ice (2008)
    In:  EPIC3Deep Sea Research Part II: Topical Studies in Oceanography, 55(8-9), pp. 1015-1023, ISSN: 0967-0645
    Details
    Publication Date: 2019-07-17
    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.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 7
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    (Table 2) Microalgal taxa and heterotrophic protists found in Arctic pack ice at ice stations during POLARSTERN cruise ARK-XIX/1 to the western Barents Sea and north of Svalbard (2007)
    PANGAEA
    Details
    Publication Date: 2023-07-09
    Keywords: Amphidinium sp.; Amphiprora sp.; Arctic Ocean; ARK-XIX/1; Attheya septentrionalis; Bacillaria paxillifer; Barents Sea; Bleakeleya cf. notata; Bodo sp.; cf. Haslea wawrikae; Chaetoceros sp.; Chlamydomonas sp.; Chlorophyceae indeterminata; Choanoflagellates indeterminata; Chrysochromulina sp.; Chrysolykos sp.; Chrysophyta cysts; Ciliates indeterminata; Coccolithophorida indeterminata; Cryothecomonas armigera; Cryptomonas spp.; Cryptophyceae indeterminata; Cylindrotheca closterium; Date/Time of event; Diatoms, centrales indeterminata; Diatoms, naviculoid indeterminata; Diatoms, resting spores, indeterminata; Dinobryon faculiferum; Dinoflagellate cyst indeterminata; Dinophyceae indeterminata; Diploneis sp.; Elevation of event; Event label; Fragilariopsis cf. oceanica; Fragilariopsis spp.; Gomphonema sp.; Goniomonas sp.; Gymnodiniales indeterminata; Gyrosigma sp.; ICE; Ice station; Katodinium sp.; Korshikoviella sp.; Latitude of event; Licmophora sp.; Lioloma sp.; Longitude of event; Mantoniella cf. squamata; MULT; Multiple investigations; Nanoflagellates indeterminata; Navicula pelagica; Navicula spp.; Nephroselmis sp.; Nitzschia frigida; Nitzschia longissima; Nitzschia spp.; Number; Paraphysomonas spp.; Parmales indeterminata; Phaeocystis pouchetii; Polarstern; Polytoma papillata; Prasinophyceae indeterminata; Prorocentrum cf. compressum; Protaspis sp.; PS64; PS64/028-1; PS64/039-1; PS64/070-6; PS64/111-3; Pseudo-nitzschia seriata; Pseudo-nitzschia spp.; Pseudo-nitzschia subcurvata; Pyramimonas spp.; Sampling date; Synedropsis hyperborea; Telonema subtile; Thalassiosira sp.; Thaumatomastix spp.
    Type: Dataset
    Format: text/tab-separated-values, 317 data points
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    DATA PANGAEA
  • 8
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    (Table 3) Abundances of under-ice fauna (〉50 µm) during POLARSTERN cruise ARK-XIX/1 to the Storfjord area in 2003 (2005)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: Acartia longiremis, c4; Acartia longiremis, c5; Acartia longiremis, female; Anonyx sarsi; ARK-XIX/1; Barents Sea; Bivalvia, larvae; Calanus finmarchicus, c3; Calanus finmarchicus, c4; Calanus finmarchicus, c5; Calanus finmarchicus, female; Chaetognatha indeterminata; Cirripedia, larvae; Clione limacina; Copepoda indeterminata; Counted from video footage; Cyclopina sp.; Date/Time of event; Decapoda, larvae; DEPTH, water; Eggs indeterminata; Event label; Foraminifera; Halectinosoma finmarchicum; Harpacticoida indeterminata; ICE; Ice station; Latitude of event; Limacina helicina; Longitude of event; Microsetella norvegica; MULT; Multiple investigations; Nematoda; Number; Oithona similis; Oncaea borealis; Polarstern; Polychaeta, larvae; PS64; PS64/028-1; PS64/039-1; PS64/070-6; Pseudocalanus minutus, c1; Pseudocalanus minutus, c2; Pseudocalanus minutus, c3; Pseudocalanus minutus, c4; Pseudocalanus minutus, c5; Pseudocalanus minutus, female; Themisto sp., juvenile; Tisbe spp.; Turbellaria
    Type: Dataset
    Format: text/tab-separated-values, 210 data points
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    DATA PANGAEA
  • 9
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    Photosynthetically active radiation and microalgae and protist occurrence at ice stations of POLARSTERN cruise ARK-XIX/1 (2007)
    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
    Details
    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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  • 10
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    Water chemistry, and abundance and carbon biomass of under-ice fauna during POLARSTERN cruise ARK-XIX/1 to the Storfjord area in 2003 (2005)
    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
    Details
    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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    DATA PANGAEA
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