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Ecosystem Engineering: Sediment entrainment and flocculation mediated by microbial produced extracellular polymeric substances (EPS)

Sediment erosion and transport is critical to the ecological and commercial health of aquatic habitats from watershed to sea. There is now a consensus that microorganisms inhabiting the system mediate the erosive response of natural sediments ('ecosystem engineers') along with physicochemical properties. The biological mechanism is through secretion of a microbial organic glue (EPS: extracellular polymeric substances) that enhances binding forces between sediment grains to impact sediment stability and post-entrainment flocculation. The proposed work will elucidate the functional capability of heterotrophic bacteria, cyanobacteria and eukaryotic microalgae for mediating freshwater sediments to influence sediment erosion and transport. The potential and relevance of natural biofilms to provide this important 'ecosystem service' will be investigated for different niches in a freshwater habitat. Thereby, variations of the EPS 'quality' and 'quantity' to influence cohesion within sediments and flocs will be related to shifts in biofilm composition, sediment characteristics (e.g. organic background) and varying abiotic conditions (e.g. light, hydrodynamic regime) in the water body. Thus, the proposed interdisciplinary work will contribute to a conceptual understanding of microbial sediment engineering that represents an important ecosystem function in freshwater habitats. The research has wide implications for the water framework directive and sediment management strategies.

Kieselalgen (Diatomeen) des Schleswig-Holsteinischen Kuestengebietes

Vor allem Benthos-Formen. Verbreitung. Oekologische Bindungen (Substrat, Salzgehalt, Jahreszeiten, Gezeiten, Diatomeen als Tiernahrung). Flora der verschiedenen Biotope (Schlick, Sand, Salz-, Brack-, Suesswasser, oberstes Litoral). Diatomees als oekologische Indikatoren (Subfossil in verschiedenen Vor- und fruehgeschichtlichen Grabungen). Taxonomie. Sammeln von Proben im Gelaende: An verschiedenen Orten; Mehrfach oder regelmaessig an denselben Stellen; Vergleich mit entsprechenden Biotopen anderer Regionen, bisher Frankreich, Skandinavien, Ostafrika, Binnenlaendische Salzstellen).

Substrate und Lebensgemeinschaften der Watten des Jadebusens

Es ist das Ziel des Vorhabens, zu einem Zeitpunkt wachsender Belastung (Ausbau Wilhelmshavens zum Oelhafen und zum Standort abwasserreicher Industrien) den Zustand repraesentativer Glieder des Oekosystems Jadebusen festzuhalten. Die Untersuchung erstreckt sich auf Substrate und Organismen der Wattflaechen (120 km2) und umfasst z.B. folgende Punkte: 1) Morphologisches Relief der Oberflaeche nach Bodenuntersuchung. 2) Verteilung niederer Pilze (Chytridineen). 3) Verteilung der autotrophen bentischen Mikroflora. 4) Verteilung der Makroflora. 5) Verteilung der benthischen Mesofauna. 6) Verteilung der bentischen Makrofauna.

Erprobungs- und Entwicklungsvorhaben 'Osterrenaturierung' - Qualitative und quantitative Erfassung von Makrozoobenthos und des Mikrobenthos vor und nach den Renaturierungsmassnahmen

Pruefung der natuerlichen Selbstreinigungskraft eines technisch ausgebauten Gewaessers durch Rueckfuehrung in einen naturnahen Zustand am Beispiel der Oster. Fliessgewaesser, Gewaesserguete.

Langzeitenwicklung und Populationsdynamik des Makrozoobenthos im Vorstrand der Insel Norderney

Seit 1977 werden in Wassertiefen zwischen 3 und 20 m in monatlichen Abstaenden die ansaessigen benthischen Lebensgemeinschaften sowie die Populationsdynamik ausgewaehlter Arten untersucht. Parallel dazu laufen sedimentologische sowie physikalisch-chemische Messungen.

Trends in der Makrofaunabesiedlung von Sand- und Schlickboeden im Sublitoral der Deutschen Bucht als Anzeichen langfristiger Milieuveraenderungen: Rueckgang in der Artenmannigfaltigkeit. Veraenderlichkeit der Bodenfauna in der Deutschen Bucht

Forschungen ueber die Veraenderungen der sand- und schlickbewohnenden Bodenfauna, insbesondere ueber einen schon mehrere Jahre andauernden Verarmungstrend im Gebiet vor Elbe- und Wesermuendung. Herausarbeitung grundsaetzlicher Unterschiede bei Schlick- und Sandfauna, insbesondere im Hinblick auf Sauerstoffverhaeltnisse und Substratveraenderungen durch Sturmeinfluesse. Forschungen ueber die Veraenderungen der sand- und schlickbesiedelte Bodenfauna in der Deutschen Bucht ueber lange Zeitraeume an Dauerstationen (Populations- und Assoziationsdynamik). Durch internationale Zusammenarbeit (europaeische LOST-Aktion 47) sollen ueberregional wirksame Einflussgroessen und Entwicklungen in den Tierbestaenden erkannt und in ihrer Bedeutung abgeschaetzt werden, so dass vom Menschen bedingte Veraenderungen sicherer beurteilt werden koennen. Die Forschungen zur Populationsdynamik dienen darueber hinaus zur Abschaetzung von Produktionsleistungen wichtiger Benthosarten.

Physical oceanography during RV HEINCKE cruise HE665

Conductivity-temperature-depth profiles were measured using a Seabird SBE 911plus CTD during RV HEINCKE cruise HE665. The CTD was equipped with duplicate sensors for temperature (SBE3plus), conductivity (SBE4) and oxygen (SBE43). Additional sensors such as a WET Labs C-Star transmissometer, a WET Labs ECO-AFL fluorometer and an altimeter (PSA-916 Teledyne (Benthos)) were mounted to the CTD. Temperature, conductivity and oxygen sensors are calibrated by the manufacturer once a year before being mounted in January. They are used throughout the year and no post-cruise or in-situ calibration is applied. All other sensors are calibrated irregularly. Data were connected to the station book of the specific cruise as available in the DSHIP database. Processing of the data including removal of obvious outliers followed the procedures described in CTD Processing Logbook of RV HEINCKE (hdl:10013/epic.47427). The processing report for this dataset is linked below.

Raw data of physical oceanography during RV HEINCKE cruise HE662

Raw physical oceanography data was acquired by a ship-based Seabird SBE911plus CTD-Rosette system onboard RV HEINCKE . The CTD was equipped with duplicate sensors for temperature (SBE3plus) and conductivity (SBE4) as well as one sensor for oxygen (SBE43). Additional sensors such as a WET Labs C-Star transmissometer, a WET Labs ECO-AFL fluorometer (FLRTD) and an altimeter (Teledyne Benthos PSA-916) were mounted to the CTD. The data was recorded using pre-cruise calibration coefficients. No correction, post-cruise calibration or quality control was applied. Processed profile data are available via the link below.

Raw data of physical oceanography during RV HEINCKE cruise HE669

Raw physical oceanography data was acquired by a ship-based Seabird SBE911plus CTD-Rosette system onboard RV HEINCKE. The CTD was equipped with duplicate sensors for temperature (SBE3plus) and conductivity (SBE4) as well as one sensor for oxygen (SBE43). Additional sensors such as a WET Labs C-Star transmissometer, a WET Labs ECO-AFL fluorometer (FLRTD) and an altimeter (Teledyne Benthos PSA-916) were mounted to the CTD. The data was recorded using pre-cruise calibration coefficients. No correction, post-cruise calibration or quality control was applied. Processed profile data are available via the link below.

Physical oceanography during RV HEINCKE cruise HE669

Conductivity-temperature-depth profiles were measured using a Seabird SBE 911plus CTD during RV HEINCKE cruise HE669. The CTD was equipped with duplicate sensors for temperature (SBE3plus), conductivity (SBE4) and oxygen (SBE43). Additional sensors such as a WET Labs C-Star transmissometer, a WET Labs ECO-AFL fluorometer and an altimeter (PSA-916 Teledyne (Benthos)) were mounted to the CTD. Temperature, conductivity and oxygen sensors are calibrated by the manufacturer once a year before being mounted in January. They are used throughout the year and no post-cruise or in-situ calibration is applied. All other sensors are calibrated irregularly. Data were connected to the station book of the specific cruise as available in the DSHIP database. Processing of the data including removal of obvious outliers followed the procedures described in CTD Processing Logbook of RV HEINCKE (hdl:10013/epic.47427). The processing report for this dataset is linked below.

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