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  • 1
    Keywords: Forschungsbericht ; Wasserverschmutzung ; Fließgewässer
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (23 Seiten, 1,38 MB) , Diagramme
    Language: German
    Note: Förderkennzeichen BMBF 02WRS1281G. - Verbund-Nummer 01102065 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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  • 2
    Online Resource
    Online Resource
    Stuttgart :Schweizerbart,
    Keywords: Ecology. ; Lake ecology. ; Limnology. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (290 pages)
    Edition: 1st ed.
    ISBN: 9783510654482
    DDC: 574.5
    Language: German
    Note: Cover -- Title -- Impressum -- Inhalt -- Vorwort -- 1 Ein See mit langer Untersuchungstradition -- 2 Bodenseeeinzugsgebiet -- 2.1 Landschaftselemente -- 2.2 Klima -- 2.2.1 Temperatur -- 2.2.2 Wind -- 2.2.3 Niederschlag -- 2.3 Zufl üsse -- 2.4 Landnutzung im Einzugsgebiet -- 2.4.1 Die natürliche Vegetation -- 2.4.2 Die heutige sekundäre Naturlandschaft -- 3 Abiotische Strukturen und Prozesse -- 3.1 Beckenmorphologie und Sedimente -- 3.1.1 Seeteile und Seebecken -- 3.1.2 Zusammensetzung und regionale Verteilung der Sedimente -- 3.1.3 Regionale Muster der Sedimentation -- 3.1.4 Jahreszeitliche Sedimentationsmuster -- 3.2 Wasserstände und Wasserhaushalt -- 3.2.1 Wasserstände -- 3.2.2 Wasserbilanz -- 3.2.3 Austausch- und Verweilzeiten -- 3.3 Schichtungsentwicklung und Durchmischungs prozesse -- 3.3.1 Wärmehaushalt des Sees -- 3.3.2 Thermische Schichtung des Sees -- 3.3.3 Oberflächenschwingungen und interne Wellen -- 3.3.4 Strömungen und turbulente Durchmischungen -- 3.3.5 Dichteströmungen -- 3.3.6 Einschichtung und Transport von Flusswasser -- 3.4 Wasserchemismus -- 3.4.1 Jahreszeitliche Änderungen der Tiefenverteilungen der Stoffe -- 4 Die Lebensgemeinschaften des Bodensees -- 4.1 Die Lebensgemeinschaft der Freiwasserzone -- 4.1.1 Pflanzliches Plankton -- 4.1.2 Die tierische Planktongemeinschaft (Zooplankton) -- 4.1.3 Bakterienplankton -- 4.1.4 Die Fische -- 4.1.5 Vertikalverteilung und vertikale Wanderungen von Plankton und Fischen -- 4.1.6 Horizontale Verteilungsmuster -- 4.1.7 Der Bodensee als Modellsystem für die pelagische Planktonsukzession -- 4.2 Die Lebensgemeinschaft der Ufer- und Flachwasserzone -- 4.2.1 Zonierung der Flachwasserzone -- 4.2.2 Pfl anzliche Lebensgemeinschaften der Ufer- und Flachwasserzone -- 4.2.3 Mikrobielle Lebensgemeinschaften -- 4.2.4 Tierische Lebensgemeinschaften -- 4.3 Die Lebensgemeinschaft des tiefen Seebodens. , 4.3.1 Die Besonderheiten des profundalen Lebensraums -- 4.3.2 Raumzeitliche Verteilungsmuster der Lebensgemeinschaften -- 4.3.3 Die wichtigsten Organismengruppen -- 4.4 Biotische Stoff- und Energieflüsse -- 4.4.1 Erfassung von Stoffkreisläufen -- 4.4.2 Schematische Darstellung der wichtigsten Stoff-Flüsse im See -- 4.4.3 Kohlenstoff- und Nährstoff-Flüsse in der Freiwasserzone des Obersees -- 4.4.4 Litorale Stoffumsätze und Sediment-Wasser-Austausch -- 4.4.5 Profundale Stoffumsätze und Sediment-Wasser-Austausch -- 4.4.6 Besonderheiten der biotischen Stoff-Flüsse des Untersees -- 5 Anthropogene Belastungen -- 5.1 Die IGKB als Instrument zum grenzüberschreitenden Gewässerschutz -- 5.2 Nährstoffbelastung (Phosphor, Stickstoff) -- 5.2.1 Eutrophierung - die bislang gravierendste Belastung des Sees -- 5.2.2 Trophierelevante Entwicklungen im Einzugsgebiet -- 5.2.3 Zeitliche Entwicklung von Nährstoff-Frachten -- 5.2.4 Chemische Reaktion des Sees auf die Änderungen der Nährstoffzufuhr -- 5.2.5 Die Reaktion der Lebensgemeinschaften auf die Nährstoffänderungen -- 5.2.6 Eutrophierung und Oligotrophierung im Untersee -- 5.2.7 Zusammenfassende Betrachtung der Trophieentwicklung -- 5.3 Einfl uss des Klimawandels und von Klimavariabilität -- 5.3.1 Auswirkungen des Klimawandels -- 5.3.2 Gründe und Auswirkungen interannueller Klimavariabilität -- 5.3.3 Welche Veränderungen sind mit einer weiteren Klimaerwärmung zu erwarten? -- 5.4 Mikroverunreinigungen -- 5.4.1 Die aktuelle Belastungssituation des Bodensee-Wasserkörpers -- 5.4.2 Die aktuelle Belastung der Sedimente -- 5.4.3 Anreicherung in Nahrungsketten -- 5.4.4 Die aktuelle Belastung der Zuflüsse -- 5.4.5 Belastungsmodelle -- 5.4.6 Bewertung des Belastungszustandes -- 5.4.7 Minimierungsmaßnahmen -- 5.4.8 Zusammenfassende Betrachtung mit Ausblick -- 5.5 Eingriffe in den Wasser- und Energiehaushalt. , 5.5.1 Flussregulierungen -- 5.5.2 Die „Rheinvorstreckung" -- 5.5.3 Speicherkraftwerke im Einzugsgebiet des Bodensees -- 5.5.4 Wasserentnahme für Trinkwasser -- 5.5.5 Nutzung des Bodenseewassers für Kühlzwecke und Wärmegewinnung -- 5.5.6 Anthropogen bedingte Veränderungen der Wasserstände -- 5.6 Belastungen der Ufer- und Flachwasserzone -- 5.6.1 IGKB-Ansatz zur Erfassung und Bewertung von Defi ziten der Ufer- und Flachwasserzone -- 5.6.2 Erfassung des Ist-Zustands -- 5.6.3 Uferrenaturierungen und Uferschutz -- 5.7 Neobiota -- 5.7.1 Neophyten -- 5.7.2 Neozoen -- 5.8 Hygienische Belastungen -- 5.8.1 Aktuelle Belastungen mit Fäkalkeimen am Bodensee -- 5.8.2 Belastungsquellen -- 5.8.3 Verbleib der Keime im Gewässer -- 5.8.4 Maßnahmenkonzepte -- 6 Standortbestimmung und Ausblick -- 6.1 Lehren aus dem Fallbeispiel Eutrophierung -- 6.2 Gewässerüberwachung und Zustandsbewertung -- 6.3 Verbleibende Wissensdefi zite -- 6.4 Ausblick -- 7 Literatur -- 8 Sach- und Artenregister.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 129 (1981), S. 357-360 
    ISSN: 1432-072X
    Keywords: Beggiatoa alba ; Continuous culture ; Chemostat ; Mixotrophic growth ; Trichomes ; Growth yields ; Sulfide oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Beggiatoa alba strain B18LD was grown in continuous culture under heterotrophic conditions on acetate or acetate and asparagine and under mixotrophic conditions on acetate plus either 1 mM sodium sulfide or 1 mM sodium thiosulfate. Considerable differences were observed between the yields and the cell compositions of heterotrophic and mixotrophic cultures at all dilution rates tested. The dry weight yield per gram acetate utilized was approximately three times higher in the acetate-sulfide mixotrophic culture than in the acetate heterotrophic culture, whereas the poly-β-hydroxybutyric acid and carbohydrate contents were much higher in the heterotrophic cultures. The high yields (0.52–0.75, corrected for the weight of the sulfur) obtained with the mixotrophic cultures imply that the acetate was utilized mainly for biosynthesis. Thus, the oxidation of sulfide supplied energy. The addition of catalase to the chemostat cultures increased yields slightly, but it was insufficient to explain the differences between the heterotrophic and the mixotrophic cultures.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Microbial ecology 11 (1985), S. 193-204 
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Regeneration of nutrients in aquatic ecosystems may be affected by autolysis, bacterial degradation, and activities of phagotrophic organisms. To examine the relative importance of these processes, mineralization of carbon, nitrogen, and phosphorus was studied in a two-stage continuous culture system. In the first stage (production compartment), aChlorella sp. was grown either axenically or in the presence of bacteria under P-limited conditions. In the presence of bacteria, the biomass of algae decreased due to efficient competition for P by bacteria. In the second stage (remineralization compartment), which was kept continuously in the dark, the nutrients incorporated by the organisms in the first stage were remineralized only slightly (0–25%) irrespective of the presence or absence of bacteria. However, remineralization of all nutrients tested was strongly increased (60–80%) after addition of zooflagellates, which grazed on algae and bacteria. These observations suggest that a net regeneration of nutrients was provided by phagotrophic organisms, whereas nutrients were trapped rather than released by bacteria. It is concluded that nutrient cycling could probably not proceed at the high velocities observed in the field without the participation of phagotrophic organisms.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Microbial ecology 5 (1979), S. 225-237 
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In continuous culture enrichments that were inoculated with activated sludge and were fed with polymeric substrates, freely dispersed single-celled bacteria belonging to theCytophaga group dominated among the initial populations, irrespective of the activated sludge source. These populations were grazed by flagellated protozoa which after several days reached high cell densities. Other morphologic bacterial groups such as spiral-shaped or filamentous bacteria then became dominant. In defined mixed culture experiments with bacterial isolates from the enrichment cultures, it was shown that a “grazing-resistant”Microcyclus strain outgrew aCytophaga strain in the presence of grazing protozoa. In contrast, theCytophaga strain competed successfully with theMicrocyclus strain and with other “grazing-resistant” strains under protozoa-free conditions. Furthermore, it was demonstrated that assumed grazing resistance factors such as floccing or filamentous growth were lost by some of the strains when they were grown for several generations in continuous culture under the same conditions, but in the absence of protozoa.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 334 (1996), S. 97-101 
    ISSN: 1573-5117
    Keywords: Tubificidae ; clay and silt content ; distribution of the species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The grain size fraction less than 63 µm is an important environmental factor affecting the distribution and abundance of many of the tubificid species of Lake Constance. In substrates with a heterogeneous grain size where tubificids can be selective many species occur almost exclusively in their particle size preference range, which is highly species specific.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 159 (1988), S. 63-73 
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Herbivorous crustacean zooplankton may influence bacterial populations of lakes directly by grazing on them or indirectly by grazing on algae. In Lake Constance a regularly observed decrease of bacterial density during periods of high abundance of cladocerans (clearwater phase) indicated bacterial grazing losses. However, cladoceran grazing on bacteria appeared to be less efficient than on algae. Moreover, cladocera reduced grazing pressure on bacteria by grazing on bacterivorous flagellates. Additionally, a shift of bacterial composition from an originally higher percentage of filamentous and aggregate growth forms towards a population of homogenously distributed small single celled bacteria was observed regularly at the beginning of the clearwater phase. Transient increases of bacterial abundance and productivity coinciding with the increase of cladocera at the end of the algal spring bloom were interpreted as field indications of indirect bacteria-zooplankton interactions due to crustacean grazing on phytoplankton. The release of organic carbon during grazing of crustacea on algae was considered as explanation for the observed stimulation of bacterial populations. Thereby, additional, otherwise inaccessible algal carbon would be made available to bacteria by zooplankton. Experimental support for this hypothesis was given by showing that bacteria were able to respond to crustacean grazing on algae by enhanced growth and activities. The possible impact of these direct and indirect crustacea-bacteria interactions on the abundance, activity and composition of bacterioplankton as well as on the structure and function of the total planktonic community is discussed.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Current microbiology 7 (1982), S. 347-350 
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A nonfloc-formingCytophaga population and a population of floc-formingZoogloea-like bacteria, which grew together in close association, became enriched in a continuous culture inoculated with activated sludge and fed by polymeric carbon sources. These bacteria were in a mutualistic relationship because theCytophaga population provided growth factors to the zoogloeal bacteria, while being protected against protozoa grazing by growing in association with zoogloeal flocs.
    Type of Medium: Electronic Resource
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  • 9
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    PERGAMON-ELSEVIER SCIENCE LTD
    In:  EPIC3Quaternary Science Reviews, PERGAMON-ELSEVIER SCIENCE LTD, 66, pp. 112-122, ISSN: 0277-3791
    Publication Date: 2017-06-27
    Description: Shells from adult specimen of the benthic ostracodes Limnocytherina sanctipatricii and Leucocythere mirabilis selected from a 8.7 m long piston core provide continuous stable oxygen and carbon records for the past approximately 16 ka. Oxygen isotopes from both species show identical values and track the general North Atlantic and European temperature history since deglaciation in great detail. Values of ostracode δ18O values suggest that about 16 cal ka the average annual air temperatures were about 11 °C colder than today. Carbon isotopic values from both species of ostracodes are similar during the Lateglacial and early Holocene, and show an overall decrease from −4‰ to −7‰ that is probably related to an increase in photosynthetic productivity in the water column, as suggested by an increase in organic carbon, delivering 13C-depleted organic matter to the bottom waters (carbon pump). About 9 cal ka only L. mirabilis δ13C values decreased about −2.5‰ within 300 years. Higher δ13C variability and ecological evidence suggests that L. mirabilis represents a summer signal, whereas L. sanctipatricii displays a more subdued annual average. After about 7 cal ka another −1.5% decrease for both species, accompanied by an increase in magnetic susceptibility, a decrease in carbonate content, and more positive bulk carbonate isotope values followed, suggesting higher detrital-clastic input into the lake.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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