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Datasets of project "Hotspot Ecosystem Research and Mans Impact On European Seas"

Mostrando recursos 1 - 20 de 514

  1. Biogeochemical investigation of cold seep sediments in the Eastern Mediterranean Sea

    Pop Ristova, Petra; Wenzhöfer, Frank; Ramette, Alban; Felden, Janine; Boetius, Antje
    Cold seep ecosystems are highly productive, fragmented ecosystems of the deep-sea floor. They form worldwide where methane reaches the surface seafloor, and are characterized by rich chemosynthetic communities fueled by the microbial utilization of hydrocarbons. Here we investigated with in situ (benthic chamber, microprofiler) and ex situ (pore water constituents, turnover rates of sulfate and methane, prokaryote abundance) techniques reduced sites from three different seep ecosystems in the Eastern Mediterranean deep-sea. At all three cold seep systems, the Amon Mud Volcano, Amsterdam Mud Volcano and the Nile Deep Sea Fan Pockmark area, we observed and sampled patches of highly reduced,...

  2. Meiofauna and nematodes in cold seep surface sediments collected during Maria S. Merian cruise MSM13 to the Eastern Mediterranean area

    de Groote, Annelies; Vanreusel, Ann
    In this study the importance of spatial scales on nematode species distribution and patterns of biodiversity and turnover in cold seeps was investigated. Therefore it was identified how nematode assemblages differ in densities and composition at different spatial scales within and between three geographically separated cold seeps, the Central pockmark area, the Amon and the Amsterdam, all located in the Eastern Mediterranean area. The replicated sampling of several reduced habitats at each seep allowed to elucidate the most important scale of turnover. The spatial scales included here range within habitat (centimeters, micro-scale), within a cold seep (10s to 100's of...

  3. Meiofauna and nematodes in cold seep surface sediments collected during Maria S. Merian cruise MSM13/4

    de Groote, Annelies; Vanreusel, Ann

  4. Meiofauna and nematodes in cold seep surface sediments collected during Maria S. Merian cruise MSM13/3

    de Groote, Annelies; Vanreusel, Ann

  5. Methane fluxes and carbonate deposits at eastern Mediterranean cold seeps

    Römer, Miriam; Sahling, Heiko; Pape, Thomas; dos Santos Ferreira, Christian; Wenzhöfer, Frank; Boetius, Antje; Bohrmann, Gerhard
    High acoustic seafloor-backscatter signals characterize hundreds of patches of methane-derived authigenic carbonates and chemosynthetic communities associated with hydrocarbon seepage on the Nile Deep Sea Fan (NDSF) in the Eastern Mediterranean Sea. During a high-resolution ship-based multibeam survey covering a ~ 225 km**2 large seafloor area in the Central Province of the NDSF we identified 163 high-backscatter patches at water depths between 1500 and 1800 m, and investigated the source, composition, turnover, flux and fate of emitted hydrocarbons. Systematic Parasound single beam echosounder surveys of the water column showed hydroacoustic anomalies (flares), indicative of gas bubble streams, above 8% of the...

  6. Methane fluxes and carbonate deposits at eastern Mediterranean cold seeps

    Römer, Miriam; Sahling, Heiko; Pape, Thomas; dos Santos Ferreira, Christian; Wenzhöfer, Frank; Boetius, Antje; Bohrmann, Gerhard
    High acoustic seafloor-backscatter signals characterize hundreds of patches of methane-derived authigenic carbonates and chemosynthetic communities associated with hydrocarbon seepage on the Nile Deep Sea Fan (NDSF) in the Eastern Mediterranean Sea. During a high-resolution ship-based multibeam survey covering a ~ 225 km**2 large seafloor area in the Central Province of the NDSF we identified 163 high-backscatter patches at water depths between 1500 and 1800 m, and investigated the source, composition, turnover, flux and fate of emitted hydrocarbons. Systematic Parasound single beam echosounder surveys of the water column showed hydroacoustic anomalies (flares), indicative of gas bubble streams, above 8% of the...

  7. (Appendix) Visually determined major and minor diameters of gas bubbles emanating from five sites at the high-backscatter patch C-1

    Römer, Miriam; Sahling, Heiko; Pape, Thomas; dos Santos Ferreira, Christian; Wenzhöfer, Frank; Boetius, Antje; Bohrmann, Gerhard

  8. (Appendix) Visually determined major and minor diameters of gas bubbles emanating from five sites at the high-backscatter patch C-1

    Römer, Miriam; Sahling, Heiko; Pape, Thomas; dos Santos Ferreira, Christian; Wenzhöfer, Frank; Boetius, Antje; Bohrmann, Gerhard

  9. (Table 3) Gas flux estimation for gas bubble streams at C-1

    Römer, Miriam; Sahling, Heiko; Pape, Thomas; dos Santos Ferreira, Christian; Wenzhöfer, Frank; Boetius, Antje; Bohrmann, Gerhard

  10. (Table 3) Gas flux estimation for gas bubble streams at C-1

    Römer, Miriam; Sahling, Heiko; Pape, Thomas; dos Santos Ferreira, Christian; Wenzhöfer, Frank; Boetius, Antje; Bohrmann, Gerhard

  11. (Table 1) Diffusive methane effluxes and AOM turnover rates at C-9

    Boetius, Antje; Wenzhöfer, Frank

  12. (Table 1) Diffusive methane effluxes and AOM turnover rates at C-9

    Boetius, Antje; Wenzhöfer, Frank

  13. Boron isotope composition and seawater characteristics of cold water scleratinian corals

    McCulloch, Malcolm; Trotter, Julie; Montagna, Paolo; Falter, Jim; Dunbar, Robert G; Freiwald, André; Försterra, Günter; López Correa, Matthias; Maier, Cornelia; Rüggeberg, Andres; Taviani, Marco
    The boron isotope systematics has been determined for azooxanthellate scleractinian corals from a wide range of both deep-sea and shallow-water environments. The aragonitic coral species, Caryophyllia smithii, Desmophyllum dianthus, Enallopsammia rostrata, Lophelia pertusa, and Madrepora oculata, are all found to have relatively high d11B compositions ranging from 23.2 per mil to 28.7 per mil. These values lie substantially above the pH-dependent inorganic seawater borate equilibrium curve, indicative of strong up-regulation of pH of the internal calcifying fluid (pH(cf)), being elevated by ~0.6-0.8 units (Delta pH) relative to ambient seawater. In contrast, the deep-sea calcitic coral Corallium sp. has a significantly...

  14. Bacterial abundance and biomass of multicorer sediment profile PS78/167-5

    Schewe, Ingo

  15. Bacterial abundance and biomass of multicorer sediment profile PS78/182-3

    Schewe, Ingo

  16. Bacterial abundance and biomass of multicorer sediment profile PS78/181-5

    Schewe, Ingo

  17. Bacterial abundance and biomass of multicorer sediment profile PS78/180-1

    Schewe, Ingo

  18. Bacterial abundance and biomass of multicorer sediment profile PS78/172-1

    Schewe, Ingo

  19. Bacterial abundance and biomass of multicorer sediment profile PS78/171-6

    Schewe, Ingo

  20. Bacterial abundance and biomass of multicorer sediment profile PS78/167-5

    Schewe, Ingo

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