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  • 2015-2019  (23)
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  • 1
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    Natural variability or anthropogenically-induced variation? Insights from 15 years of multidisciplinary observations at the arctic marine LTER site HAUSGARTEN (2016)
    Elsevier
    In:  Ecological Indicators, 65 . pp. 89-102.
    Details
    Publication Date: 2019-02-01
    Description: Time-series studies of arctic marine ecosystems are rare. This is not surprising since polar regions are largely only accessible by means of expensive modern infrastructure and instrumentation. In 1999, the Alfred Wegener Institute, Helmholtz-Centre for Polar and Marine Research (AWI) established the LTER (Long-Term Ecological Research) observatory HAUSGARTEN crossing the Fram Strait at about 79° N. Multidisciplinary investigations covering all parts of the open-ocean ecosystem are carried out at a total of 21 permanent sampling sites in water depths ranging between 250 and 5500 m. From the outset, repeated sampling in the water column and at the deep seafloor during regular expeditions in summer months was complemented by continuous year-round sampling and sensing using autonomous instruments in anchored devices (i.e., moorings and free-falling systems). The central HAUSGARTEN station at 2500 m water depth in the eastern Fram Strait serves as an experimental area for unique biological in situ experiments at the seafloor, simulating various scenarios in changing environmental settings. Long-term ecological research at the HAUSGARTEN observatory revealed a number of interesting temporal trends in numerous biological variables from the pelagic system to the deep seafloor. Contrary to common intuition, the entire ecosystem responded exceptionally fast to environmental changes in the upper water column. Major variations were associated with a Warm-Water-Anomaly evident in surface waters in eastern parts of the Fram Strait between 2005 and 2008. However, even after 15 years of intense time-series work at HAUSGARTEN, we cannot yet predict with complete certainty whether these trends indicate lasting alterations due to anthropologically-induced global environmental changes of the system, or whether they reflect natural variability on multiyear time-scales, for example, in relation to decadal oscillatory atmospheric processes.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.ecolind.2015.10.001
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    (Fig. 6a) Oxygen profiles from in situ measurements below the carcasses and in control sediments at station ATL05/06-2 at 2500 m water depth (2017)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Keywords: ATL05; ATL05/06-2; DEPTH, sediment/rock; FRAM; FRontiers in Arctic marine Monitoring; Hausgarten; L Atalante; Long-term Investigation at AWI-Hausgarten off Svalbard; Oxygen; VICTOR; Victor/D3; Victor6000 ROV
    Type: Dataset
    Format: text/tab-separated-values, 965 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    (Fig. 6b) Oxygen profiles from in situ measurements below the carcasses and in control sediments at station ATL05/03-2 at 5000 m water depth (2017)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Keywords: ATL05; ATL05/03-2; DEPTH, sediment/rock; FRAM; FRontiers in Arctic marine Monitoring; Hausgarten; L Atalante; Long-term Investigation at AWI-Hausgarten off Svalbard; Molloy Deep; Oxygen; VICTOR; Victor/D2; Victor6000 ROV
    Type: Dataset
    Format: text/tab-separated-values, 1399 data points
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    DATA PANGAEA
  • 4
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    (Table 1) Environmental, bacterial, and meiofaunal data in surface sediments at various positions around the carcasses and adjacent control sediments (2017)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Keywords: ATL05; ATL05/03-2_PUC-1; ATL05/03-2_PUC-11; ATL05/03-2_PUC-19-1; ATL05/03-2_PUC-24; ATL05/03-2_PUC-3; ATL05/03-2_PUC-6; ATL05/03-2_PUC-7; ATL05/03-2_PUC-8; ATL05/03-2_PUC-9; ATL05/03-2_PUC-9-1; ATL05/06-2_PUC-1; ATL05/06-2_PUC-10; ATL05/06-2_PUC-11; ATL05/06-2_PUC-2; ATL05/06-2_PUC-3; ATL05/06-2_PUC-4; ATL05/06-2_PUC-6; ATL05/06-2_PUC-7; ATL05/06-2_PUC-8; ATL05/06-2_PUC-9; ATL05/D2/1; ATL05/D3/1; Bacteria, abundance; Bacteria, biomass as carbon; Biomass per bacterial cell; Chlorophyll a; Chloroplastic pigment equivalents per volume; Date/Time of event; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Esterase activity per sediment volume; Event label; FRAM; FRontiers in Arctic marine Monitoring; Hausgarten; L Atalante; Latitude of event; Longitude of event; Long-term Investigation at AWI-Hausgarten off Svalbard; Meiofauna, other; Metazoa; Molloy Deep; Nematoda; Phaeopigments; Phospholipids; PUC; Push corer; Sample position
    Type: Dataset
    Format: text/tab-separated-values, 280 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Results from an in situ experiment at the deep-sea observatory HAUSGARTEN (2017)
    PANGAEA
    In:  Supplement to: Soltwedel, Thomas; Guilini, Katja; Sauter, Eberhard-Jürgen; Schewe, Ingo; Hasemann, Christiane (2017): Local effects of large food-falls on nematode diversity at an arctic deep-sea site:Results from an in situ experiment at the deep-sea observatory HAUSGARTEN. Journal of Experimental Marine Biology and Ecology, https://doi.org/10.1016/j.jembe.2017.03.002
    Details
    Publication Date: 2023-05-12
    Description: To study the response of the smaller benthic biota to larger food-falls and their possible effects on the biodiversity at the deep seafloor, we deployed the halves of a sagittally bisected porpoise (1.3 m in length; each half approximately 18 kg) at 2500 m and 5400 m water depth at the LTER (Long-Term Ecological Research) observatory HAUSGARTEN in the eastern Fram Strait. The sampling of sediments beneath the carcass halves and at different distances (0, 20, 40 cm) from these artificial food-falls was carried out by means of push-corers handled by a Remotely Operated Vehicle five weeks after the food deployment. The samples provided empirical evidence for a quick response by sediment-inhabiting bacteria and metazoan meiofauna to the carcasses at both water depths. Compared to control sediments, the substantial pulse of organic matter also led to generally increased meiofauna/nematode densities around the artificial food-falls. The comparison of nematode communities in sediments affected by the carcasses with those in background control sediments exhibited shifts in the structural composition and the associated trophic and functional diversity of the nematode fauna. Our results confirmed that the impact of large food-falls on the deep benthic community largely depends on environmental factors (water depth, alternative food sources) as well as the background species composition, i.e., the structure of the prevailing meiofauna/nematode assemblages and the composition of the necrophagous community present in the wider area.
    Keywords: FRAM; FRontiers in Arctic marine Monitoring; Hausgarten; Long-term Investigation at AWI-Hausgarten off Svalbard
    Type: Dataset
    Format: application/zip, 7 datasets
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    DATA PANGAEA
  • 6
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    Macrofauna abundance and biomass at the LTER observatory HAUSGARTEN in 2016 (2019)
    PANGAEA
    In:  Supplement to: Käß, Melissa; Vedenin, Andrey; Hasemann, Christiane; Brandt, Angelika; Soltwedel, Thomas (2019): Community structure of macrofauna in the deep Fram Strait: A comparison between two bathymetric gradients in ice-covered and ice-free areas. Deep Sea Research Part I: Oceanographic Research Papers, 103102, https://doi.org/10.1016/j.dsr.2019.103102
    Details
    Publication Date: 2023-02-23
    Description: Macrofauna data was collected using a box corer (0.25m² sampling area). The sampled sediment from each box corer was divided into eight subsamples (pseudoreplicates). The uppermost 12 cm of these subsamples were analyzed. Each subsample was processed through a 500-µm mesh size sieve. After sieving, residuals were fixed with 100% ethanol and stored at room temperature. Macrofaunal organisms were identified to the lowest possible taxonomical level. Whenever identification to species level was not possible, the sample was identified to the next identifiable taxonomical category and assigned a putative species name (e.g., 'Hesionidae genus sp. 1', 'Hesionidae genus sp. 2'). Posterior fragments, exuviae, xenobionts, meiofauna taxa (Nematoda, Ostracoda, Harpacticoida) and empty tubes were excluded from the analysis. Biomass (blotted wet weight, ww) was determined by weighing each specimen. Shelled organisms, such as mollusks, were weight in their shells.
    Keywords: ARK-XXX/1.2; Biomass, wet mass; Character; EG_IV; ELEVATION; Event label; Family; Genus; Giant box corer; GKG; HG_IV; LATITUDE; LONGITUDE; North Greenland Sea; Phylum; Polarstern; PS99/042-14; PS99/048-13; PS99/049-3; PS99/050-3; PS99/051-8; PS99/062-2; PS99/066-4; PS99/069-6; PS99.2; Replicate; Species; Station label
    Type: Dataset
    Format: text/tab-separated-values, 14989 data points
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    DATA PANGAEA
  • 7
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    Total oxygen fluxes, and diatom density, diatom biomass and diversity of the diatom community in spring 2016 and environmental photosynthetically active radiation from 2015 and 2016 from three stations in Potter Cove, Antarctica (2018)
    PANGAEA
    In:  Supplement to: Hoffmann, Ralf; Al-Handal, Adil Yousif; Wulff, Angela; Deregibus, Dolores; Zacher, Katharina; Quartino, Maria Liliana; Wenzhöfer, Frank; Braeckman, Ulrike (2019): Implications of Glacial Melt-Related Processes on the Potential Primary Production of a Microphytobenthic Community in Potter Cove (Antarctica). Frontiers in Marine Science, 6, https://doi.org/10.3389/fmars.2019.00655
    Details
    Publication Date: 2023-02-23
    Description: The Antarctic Peninsula experiences a fast retreat of glaciers, which correlates with an increased release of particles and related increased sedimentation and thus, a decrease in the available light for benthic primary production. We investigated how changes in the general sedimentation and shading patterns affect the primary production by benthic microalgae, the microphytobenthos. In order to determine potential net primary production and respiration of the microphytobenthic community, sediment cores from locations exposed to different sedimentation rates and shading were exposed to photosynthetic active radiation (PAR, 400–700 nm) of 0–70 µmol photons m-2 s-1. Total oxygen fluxes and microphytobenthic diatom community structure, density, and biomass were determined. Our study revealed that the net primary production of the microphytobenthos decreased with increasing sedimentation and shading, while the microphytobenthic diatom density and composition remained similar. By comparing our experimental results with in situ measured PAR intensities, we furthermore assessed the microphytobenthic primary production as an important carbon source within Potter Cove's benthic ecosystem. We propose that the microphytobenthic contribution to the total primary production may drop drastically due to Antarctic glacial retreat and correlated sedimentation and shading, with yet unknown consequences for the benthic heterotrophic community, its structure, and diversity.
    Type: Dataset
    Format: application/zip, 7 datasets
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    DATA PANGAEA
  • 8
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    Density, biomass and diversity of the diatom community at Faro, Creek and Isla D in Potter Cove (King George Island) in November and December 2016 (2018)
    PANGAEA
    Details
    Publication Date: 2023-07-09
    Keywords: Achnanthes bongrain; Achnanthes bongrain, biomass as carbon; Actinocyclus actinochilus; Actinocyclus actinochilus, biomass as carbon; Amphora gourdonii; Amphora gourdonii, biomass as carbon; Amphora holsatica; Amphora holsatica, biomass as carbon; Amphora marina; Amphora marina, biomass as carbon; Amphora sp.; Amphora sp., biomass as carbon; Asteromphalus parvulus; Asteromphalus parvulus, biomass as carbon; Biremis sp.; Biremis sp., biomass as carbon; Cocconeis costata; Cocconeis costata, biomass as carbon; Cocconeis imperatrix; Cocconeis imperatrix, biomass as carbon; Cocconeis matsii; Cocconeis matsii, biomass as carbon; Cocconeis orbicularis; Cocconeis orbicularis, biomass as carbon; Cocconeis pottercovei; Cocconeis pottercovei, biomass as carbon; Cocconeis schuettii; Cocconeis schuettii, biomass as carbon; Corethron pennatum; Corethron pennatum, biomass as carbon; DATE/TIME; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Diploneis smithii; Diploneis smithii, biomass as carbon; DIVER; Elevation of event; Elevation of event 2; Entomoneis gigantea; Entomoneis gigantea, biomass as carbon; Entomoneis kjellmanii; Entomoneis kjellmanii, biomass as carbon; Entomoneis paludosa; Entomoneis paludosa, biomass as carbon; Entopyla ocellata; Entopyla ocellata, biomass as carbon; Event label; Fragilariopsis cylindrus; Fragilariopsis cylindrus, biomass as carbon; Gyrosigma arcuatum; Gyrosigma arcuatum, biomass as carbon; Gyrosigma fasciola; Gyrosigma fasciola, biomass as carbon; Gyrosigma obscurum; Gyrosigma obscurum, biomass as carbon; Latitude of event; Licmophora antarctica; Licmophora antarctica, biomass as carbon; Licmophora decora; Licmophora decora, biomass as carbon; Longitude of event; Lyrella abrupta; Lyrella abrupta, biomass as carbon; Navicula cancellata; Navicula cancellata, biomass as carbon; Navicula directa; Navicula directa, biomass as carbon; Navicula perminuta; Navicula perminuta, biomass as carbon; Nitzschia angularis; Nitzschia angularis, biomass as carbon; Nitzschia hybrida; Nitzschia hybrida, biomass as carbon; Odontella litigiosa; Odontella litigiosa, biomass as carbon; Parlibellus delognei; Parlibellus delognei, biomass as carbon; Petroneis plagiostoma; Petroneis plagiostoma, biomass as carbon; Petroneis sp.; Petroneis sp., biomass as carbon; Pinnularia quadratarea; Pinnularia quadratarea, biomass as carbon; Pleurosigma strigosum; Pleurosigma strigosum, biomass as carbon; Porosira glacialis; Porosira glacialis, biomass as carbon; PotterCove_Creek_2016-L; PotterCove_Creek_2016-S; PotterCove_Faro_2016-L; PotterCove_Faro_2016-S; PotterCove_Isla_D_2016-L; PotterCove_Isla_D_2016-S; Potter Cove, King George Island, Antarctic Peninsula; Pseudogomphonema kamtschaticum; Pseudogomphonema kamtschaticum, biomass as carbon; Replicate; Rhabdonema arcuatum; Rhabdonema arcuatum, biomass as carbon; Sampling by diver; Shannon Diversity Index; Site; Surirella sp.; Surirella sp., biomass as carbon; Synedropsis fragilis; Synedropsis fragilis, biomass as carbon; Thalassiosira gravida; Thalassiosira gravida, biomass as carbon; Thalassiosira maculata; Thalassiosira maculata, biomass as carbon; Thalassiosira sp.; Thalassiosira sp., biomass as carbon; Thalassiosira tumida; Thalassiosira tumida, biomass as carbon; Trachyneis aspera; Trachyneis aspera, biomass as carbon
    Type: Dataset
    Format: text/tab-separated-values, 1212 data points
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    DATA PANGAEA
  • 9
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    (Table 2) Nematode abundances per genera with their c–p values (CP) and feeding types (FT) in sediments around the carcasses and nearby control sites at 2500 m and 5400 m water depth (2017)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: Acantholaimus; Aegialoalaimus; Ammotheristus; Amphimonhystera; Amphimonhystrella; Anticoma; Anticyathus; Antomicron; ARK-XXI/1b; ATL05; ATL05/03-2_PUC-1; ATL05/03-2_PUC-11; ATL05/03-2_PUC-19-1; ATL05/03-2_PUC-24; ATL05/03-2_PUC-3; ATL05/03-2_PUC-6; ATL05/03-2_PUC-7; ATL05/03-2_PUC-8; ATL05/03-2_PUC-9; ATL05/03-2_PUC-9-1; ATL05/06-2_PUC-1; ATL05/06-2_PUC-10; ATL05/06-2_PUC-11; ATL05/06-2_PUC-2; ATL05/06-2_PUC-3; ATL05/06-2_PUC-4; ATL05/06-2_PUC-6; ATL05/06-2_PUC-7; ATL05/06-2_PUC-8; ATL05/06-2_PUC-9; ATL05/D2/1; ATL05/D3/1; Calomicrolaimus; Camacolaimus; Campylaimus; Cephalochaetosoma; Cervonema; Chromadora; Cyartonema; Daptonema; Date/Time of event; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Desmoscolex; Dichromadora; Diplopeltoides; Diplopeltula; Draconematidae; Eleutherolaimus; Elevation of event; Elzalia; Enchonema; Eurystomina; Event label; Fenestrolaimus; FRAM; FRontiers in Arctic marine Monitoring; Halalaimus; Halichoanolaimus; Hausgarten; HG_IV; HG_IX; Ixonema; L Atalante; Latitude of event; Leptolaimoides; Leptolaimus; Longitude of event; Long-term Investigation at AWI-Hausgarten off Svalbard; Manganonema; Metalinhomoeus; Microlaimus; Molgolaimus; Molloy Deep; Monhystrella; MUC; MultiCorer; Neochromadora; North Greenland Sea; Oxystomina; Pandolaimus; Paramesacanthion; Paramesonchium; Paramonhystera; Pierrickia; Polarstern; Procamacolaimus; Promonhystera; PS68; PS68/238-3; PS68/242-2; Pselionema; PUC; Push corer; Rhips; Sabatieria; Sample position; Southerniella; Sphaerolaimus; Spilophorella; Spirinia; Syringolaimus; Thalassomonhystera; Theristus; Tricoma; Xyalidae
    Type: Dataset
    Format: text/tab-separated-values, 1586 data points
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    DATA PANGAEA
  • 10
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    Microplastics prevail at all ocean depths of the HAUSGARTEN observatory (Arctic) (2018)
    In:  EPIC3MICRO2018 Fate and Impacts of Microplastics: Knowledge, Actions and Solutions, 2018-10-15-2018-10-19
    Details
    Publication Date: 2018-12-30
    Description: Although recent research indicates that microplastic (MP) has spread to all marine ecosystem compartments from the sea surface to the deep sea, our knowledge about the distribution through the water column is still limited and largely based on model runs. To fill this gap, we deployed WTS-LV large volume pumps at four different depths (sea surface, ~300m, ~1000m, near seafloor) at five stations of the HAUSGARTEN observatory (west of Svalbard). These pumps filtered 218–560 litres of seawater during each deployment with 10 µm mesh metal filters. Additionally, sediment was sampled at the same stations to understand accumulation mechanisms of MP in the sediment. Our analyses of water column samples using µFTIR spectroscopy resulted in 0–1373 MP m-3, comprising 15 different polymer types. MP concentrations in the sediment were found 1,200-33,000 times higher than in the water column. The northernmost station, which is located in the transition zone between the open ocean and sea ice, harboured the highest mean concentration (416 MP m-3) through the water column, and polyamide accounted for the largest proportion. The surface waters had the highest MP concentrations at all stations with a decrease towards the sediment. Our results will be compared with trends in the vertical distribution of organic particles and discussed in the context of prevailing water masses and sea ice coverage. Still, our preliminary results highlight that noticeable amounts of MP are present throughout the water column, Earth’s largest biome, which has been largely neglected in previous estimates of plastic in the world’s oceans.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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    PAPER (OA)
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