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  • 1
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    LTER HAUSGARTEN 2018 - Long-Term Ecological Research in the Fram Strait, Cruise No. MSM77, September 15 - October 13, 2018, Longyearbyen (Svalbard) - Edinburgh (Scotland) (2019)
    In:  EPIC3MARIA S. MERIAN-Berichte, MSM77, 51 p.
    Details
    Publication Date: 2019-04-05
    Description: The 77th cruise of the RV MARIA S. MERIAN contributed to various large national and international research and infrastructure projects (FRAM, ARCHES, INTAROS, ICOS, SIOS) as well as to the research programme PACES-II (Polar Regions and Coasts in the changing Earth System) of the Alfred-Wegener-Institute Helmholtz-Center for Polar and Marine Research (AWI). Investigations within Work Package 4 (Arctic sea ice and its interaction with ocean and ecosystems) of the PACES-II programme, aim at assessing and quantifying ecosystem changes from surface waters to the deep ocean in response to the retreating sea ice, and at exploring the most important (feedback) processes determining temporal and spatial variability. Contributions to the PACES-II Work Package 6 (Large scale variability and change in polar benthic biota and ecosystem functions) include the identification of spatial patterns and temporal trends in relevant benthic community functions, and the development of a comprehensive science community reference collection of observational data. Work carried out within WPs 4 and 6 will support the time-series studies at the LTER (Long-Term Ecological Research) observatory HAUSGARTEN (Fig. 1.1), where we document Global Change induced environmental variations on a polar deep-water ecosystem. This work is carried out in close co-operation between the HGF-MPG Joint Research Group on Deep-Sea Ecology and Technology and the PEBCAO Group (Phytoplankton Ecology and Biogeochemistry in the Changing Arctic Ocean) at AWI as well as the working group Microbial Geochemistry at the GEOMAR and the HGF Young Investigators Group SEAPUMP (Seasonal and regional food web interactions with the biological pump).
    Repository Name: EPIC Alfred Wegener Institut
    Type: Miscellaneous , notRev
    Format: application/pdf
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  • 2
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    Community structure of macrobenthos along two bathymetrical transects off Svalbard and on the Eastern Greenland continental margin – A comparative study at the LTER (Long-Term Ecological Research) observatory HAUSGARTEN (2017)
    In:  EPIC3
    Details
    Publication Date: 2017-04-01
    Description: The eastern side of the Fram Strait is significantly influenced by the northern-bound warm West Spitsbergen Current (WSC) whereas the western side is affected by the cold and less saline East Greenland Current (EGC) flowing in a southerly direction. These current regimes are major factors in regulating the ice coverage in the Fram strait. In turn, this coverage plays an important role in determining the flux of food to the seafloor. The objective of this study is to compare the macrofaunal community structure along two bathymetrical transects (1000 to 2500 m) at the LTER (Long-Term Ecology Research) observatory HAUSGARTEN; one transect in the eastern Fram Strait and a second in the western region of the strait. Material was collected during RV Polarstern expedition PS99.2 in June/July 2016 using an USNEL box corer with a sampling area of 0.25 m². Samples were processed through a 500 μm mesh size sieve. Results showed a higher macrofaunal density at the stations located in the eastern Fram Strait. Species richness, biomass and biodiversity showed a trend to decrease with increase in depth on both sides of the strait. An exception was observed at one station at 2500 m depth off Greenland, which was located in the marginal ice zone. Densities and species diversity were higher at this station than at the adjacent shallower sampling locations. Polychaetes were the generally most abundant taxon, followed by crustaceans and molluscs. Species composition along the two bathymetrical transects on both sides of the strait clearly changed with increasing depth. Sea ice coverage and depth, with the associated variabilities in food quality and quantity reaching the seafloor seemed to be crucial factors driving community patterns.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Thesis , notRev
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