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  • 1
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    Summertime plankton ecology in Fram Strait - a compilation of long- and short-term observations (2015)
    Norwegian Polar Institute
    In:  Polar Research, 34 (23349).
    Details
    Publication Date: 2019-07-10
    Description: Between Greenland and Spitsbergen, Fram Strait is a region where cold ice-covered Polar Water exits the Arctic Ocean with the East Greenland Current (EGC) and warm Atlantic Water enters the Arctic Ocean with the West Spitsbergen Current (WSC). In this compilation, we present two different data sets from plankton ecological observations in Fram Strait: (1) long-term measurements of satellite-derived (1998–2012) and in situ chlorophyll a (chl a) measurements (mainly summer cruises, 1991–2012) plus protist compositions (a station in WSC, eight summer cruises, 1998–2011); and (2) short-term measurements of a multidisciplinary approach that includes traditional plankton investigations, remote sensing, zooplankton, microbiological and molecular studies, and biogeochemical analyses carried out during two expeditions in June/July in the years 2010 and 2011. Both summer satellite-derived and in situ chl a concentrations showed slight trends towards higher values in the WSC since 1998 and 1991, respectively. In contrast, no trends were visible in the EGC. The protist composition in the WSC showed differences for the summer months: a dominance of diatoms was replaced by a dominance of Phaeocystis pouchetii and other small pico- and nanoplankton species. The observed differences in eastern Fram Strait were partially due to a warm anomaly in the WSC. Although changes associated with warmer water temperatures were observed, further long-term investigations are needed to distinguish between natural variability and climate change in Fram Strait. Results of two summer studies in 2010 and 2011 revealed the variability in plankton ecology in Fram Strait.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3402/polar.v34.23349
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Shift in Particulate matter flux in the Eastern Fram Straint - Rresults from a long-term sediment trap study at the LTER site Hausgarten since 2000 (2015)
    In:  [Talk] In: ASLO Aquatic Sciences Meeting 2015, 22.-27.02.2015, Granada, Spain .
    Details
    Publication Date: 2020-11-02
    Description: The composition of particles obtained by annually moored sediment traps have been analysed at the Long-Term Ecological Research (LTER) site HAUSGARTEN in Fram Strait (79?/4?E) since 2000. The open ocean observatory is seasonally covered by sea ice and is influenced by the inflow of relatively warm Atlantic Waters at the surface. Exceptionally warm Atlantic Water with temperatures of 〉3?C entered Fram Strait during 2006/7. We present data on the export of total particulate matter (TPM), particulate organic carbon and nitrogen (POC/PON), biogenic particulate silica (bPSi), calcium carbonate (CaCO3), and protist composition achieved during 2000-2011. Annual fluxes showed greatest variation (3-5 folds) for TPM and CaCO3 flux and a drastic decrease in bPSi, a proxy for diatoms, after 2004. Variations in the flux of CaCO3 and its increase during and after the warming event in 2006/7 could be attributed to an increase of pteropods, namely the boreal species Limacina retroversa. Pteropod carbonate (aragonite) dominated with up to ~80% in the total CaCO3 flux, which is also reflected in the POC/PIC ratio indicating repercussions on the biological carbon pump.
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 3
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    Chlorophyll a measured on water bottle samples during POLARSTERN cruise ARK-XXVI/1 (2015)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Keywords: ARK-XXVI/1; AWI_BioOce; Biological Oceanography @ AWI; Chlorophyll a; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Latitude of event; Longitude of event; North Greenland Sea; Norwegian Sea; Polarstern; PS78; PS78/003-1; PS78/009-1; PS78/014-1; PS78/019-6; PS78/022-1; PS78/025-6; PS78/030-1; PS78/031-1; PS78/034-1; PS78/035-1; PS78/037-1; PS78/039-1; PS78/041-1; PS78/044-1; PS78/047-1; PS78/050-1; PS78/054-1; PS78/061-1; PS78/063-1; PS78/066-1; PS78/069-1; PS78/071-1; PS78/073-1; PS78/075-1; PS78/078-1; PS78/089-1; PS78/112-1; PS78/127-2
    Type: Dataset
    Format: text/tab-separated-values, 168 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Flux of organisms at AWI HAUSGARTEN from mooring Fevi16 (2016)
    PANGAEA
    Details
    Publication Date: 2023-03-25
    Keywords: Appendicularia, fecal pellet carbon, flux; Appendicularia, fecal pellet volume; ARK-XXII/1c; Coccolithophoridae cell, flux; Copepoda, fecal pellet carbon, flux; Copepoda, fecal pellet volume; DATE/TIME; DEPTH, water; Diatoms, empty, valve, flux; Diatoms, full, valve, flux; Diatoms, total, valve, flux; Duration, number of days; Fecal pellet carbon, flux; FEVI16; Flagellates, flux; Mooring (long time); MOORY; North Greenland Sea; Polarstern; PS70; PS70/218-1, HGIV; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 570 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Flux of organisms at AWI HAUSGARTEN from mooring Lander-2007 (2016)
    PANGAEA
    Details
    Publication Date: 2023-03-25
    Keywords: Appendicularia, fecal pellet carbon, flux; Appendicularia, fecal pellet volume; ARK-XXII/1c; Coccolithophoridae cell, flux; Copepoda, fecal pellet carbon, flux; Copepoda, fecal pellet volume; DATE/TIME; DEPTH, water; Diatoms, empty, valve, flux; Diatoms, full, valve, flux; Diatoms, total, valve, flux; Duration, number of days; Fecal pellet carbon, flux; Lander-2007; Mooring (long time); MOORY; North Greenland Sea; Polarstern; PS70; PS70/223-1; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 116 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Flux of biomarkers and organisms at AWI HAUSGARTEN from two moorings (2016)
    PANGAEA
    In:  Supplement to: Lalande, Catherine; Nöthig, Eva-Maria; Bauerfeind, Eduard; Hardge, Kristin; Beszczynska-Möller, Agnieszka; Fahl, Kirsten (2016): Lateral supply and downward export of particulate matter from upper waters to the seafloor in the deep eastern Fram Strait. Deep Sea Research Part I: Oceanographic Research Papers, 114, 78-89, https://doi.org/10.1016/j.dsr.2016.04.014
    Details
    Publication Date: 2023-01-13
    Description: Time-series sediment traps were deployed at 4 depths in the eastern Fram Strait from July 2007 to June 2008 to investigate variations in the magnitude and composition of the sinking particulate matter from upper waters to the seafloor. Sediment traps were deployed at 196 m in the Atlantic Water layer, at 1296 and 2364 m in the intermediate and deep waters, and at 2430 m on a benthic lander in the near-bottom layer. Fluxes of total particulate matter, particulate organic carbon, particulate organic nitrogen, biogenic matter, lithogenic matter, biogenic particulate silica, calcium carbonate, dominant phytoplankton cells, and zooplankton fecal pellets increased with depth, indicating the importance of lateral advection on fluxes in the deep Fram Strait. The lateral supply of particulate matter was further supported by the constant fluxes of biomarkers such as brassicasterol, alkenones, campesterol, beta-sitosterol, and IP25 at all depths sampled. However, enhanced fluxes of diatoms and appendicularian fecal pellets from the upper waters to the seafloor in the presence of ice during spring indicated the rapid export (15-35 days) of locally-produced large particles that likely contributed most of the food supply to the benthic communities. These results show that lateral supply and downward fluxes are both important processes influencing the transport of particulate matter to the seafloor in the deep eastern Fram Strait, and that particulate matter size dictates the prevailing sinking process.
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Chlorophyll a in Arctic Ocean, Fram Strait, and Greenland Sea, 1991-2012 (2015)
    PANGAEA
    In:  Supplement to: Nöthig, Eva-Maria; Bracher, Astrid; Engel, Anja; Metfies, Katja; Niehoff, Barbara; Peeken, Ilka; Bauerfeind, Eduard; Cherkasheva, Alexandra; Gäbler-Schwarz, Stefanie; Hardge, Kristin; Kilias, Estelle; Kraft, Angelina; Mebrahtom Kidane, Yohannes; Lalande, Catherine; Piontek, Judith; Thomisch, Karolin; Wurst, Mascha (2015): Summertime plankton ecology in Fram Strait—a compilation of long- and short-term observations. Polar Research, 34, 18 pp, https://doi.org/10.3402/polar.v34.23349
    Details
    Publication Date: 2023-06-21
    Description: Between Greenland and Spitsbergen, Fram Strait is a region where cold ice-covered Polar Water exits the Arctic Ocean with the East Greenland Current (EGC) and warm Atlantic Water enters the Arctic Ocean with the West Spitsbergen Current (WSC). In this compilation, we present two different data sets from plankton ecological observations in Fram Strait: (1) long-term measurements of satellite-derived (1998-2012) and in situ chlorophyll a (chl a) measurements (mainly summer cruises, 1991-2012) plus protist compositions (a station in WSC, eight summer cruises, 1998-2011); and (2) short-term measurements of a multidisciplinary approach that includes traditional plankton investigations, remote sensing, zooplankton, microbiological and molecular studies, and biogeochemical analyses carried out during two expeditions in June/July in the years 2010 and 2011. Both summer satellite-derived and in situ chl a concentrations showed slight trends towards higher values in the WSC since 1998 and 1991, respectively. In contrast, no trends were visible in the EGC. The protist composition in the WSC showed differences for the summer months: a dominance of diatoms was replaced by a dominance of Phaeocystis pouchetii and other small pico- and nanoplankton species. The observed differences in eastern Fram Strait were partially due to a warm anomaly in the WSC. Although changes associated with warmer water temperatures were observed, further long-term investigations are needed to distinguish between natural variability and climate change in Fram Strait. Results of two summer studies in 2010 and 2011 revealed the variability in plankton ecology in Fram Strait.
    Keywords: AWI_BioOce; Biological Oceanography @ AWI
    Type: Dataset
    Format: application/zip, 24 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Flux of biomarkers at AWI HAUSGARTEN from mooring Fevi16 (2016)
    PANGAEA
    Details
    Publication Date: 2023-11-30
    Keywords: 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, flux; 24-Ethylcholest-5-en-3beta-ol, flux; 24-Methylcholest-5-en-3beta-ol, flux; 24-Methylcholesta-5,22E-dien-3beta-ol, flux; Alkenone, flux; ARK-XXII/1c; Calculated; DATE/TIME; DEPTH, water; Duration, number of days; FEVI16; Mooring (long time); MOORY; North Greenland Sea; Polarstern; PS70; PS70/218-1, HGIV; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 399 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Flux of biomarkers at AWI HAUSGARTEN from mooring Lander-2007 (2016)
    PANGAEA
    Details
    Publication Date: 2023-11-30
    Keywords: 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, flux; 24-Ethylcholest-5-en-3beta-ol, flux; 24-Methylcholest-5-en-3beta-ol, flux; 24-Methylcholesta-5,22E-dien-3beta-ol, flux; Alkenone, flux; ARK-XXII/1c; Calculated; DATE/TIME; DEPTH, water; Duration, number of days; Lander-2007; Mooring (long time); MOORY; North Greenland Sea; Polarstern; PS70; PS70/223-1; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 84 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Impact of sequence processing and taxonomic classification approaches on eukaryotic community structure from environmental samples with emphasis on diatoms (2018)
    In:  EPIC3Molecular Ecology Resources, 18(2), pp. 204-216
    Details
    Publication Date: 2018-06-01
    Description: Next‐generation sequencing is a common method for analysing microbial community diversity and composition. Configuring an appropriate sequence processing strategy within the variety of tools and methods is a nontrivial task and can considerably influence the resulting community characteristics. We analysed the V4 region of 18S rRNA gene sequences of marine samples by 454‐pyrosequencing. Along this process, we generated several data sets with QIIME, mothur, and a custom‐made pipeline based on DNAStar and the phylogenetic tree‐based PhyloAssigner. For all processing strategies, default parameter settings and punctual variations were used. Our results revealed strong differences in total number of operational taxonomic units (OTUs), indicating that sequence preprocessing and clustering had a major impact on protist diversity estimates. However, diversity estimates of the abundant biosphere (abundance of ≥1%) were reproducible for all conducted processing pipeline versions. A qualitative comparison of diatom genera emphasized strong differences between the pipelines in which phylogenetic placement of sequences came closest to light microscopy‐based diatom identification. We conclude that diversity studies using different sequence processing strategies are comparable if the focus is on higher taxonomic levels, and if abundance thresholds are used to filter out OTUs of the rare biosphere.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
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