Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"biomanipulation"”.
-
Assessing the use of Viviparus georgianus snails as a means for biomanipulation of cyanobacterial species Microcystis aeruginosa
… can be fatal to organisms, including humans. Biomanipulation of cyanobacterial harmful algal blooms (CHABs) aims to proactively prevent their formation by maintaining continuous foraging pressure on cyanobacterial populations by increasing the number of some selected foraging organisms in the …
-
Nahrungsnetzbewirtschaftung in Mittelgebirgstalsperren
"Biomanipulation" was carried out in order to try and improve the water quality of six deep reservoirs situated in the catchment area of the River Wupper. All the reservoirs are deep, dimictic soft-water lake types, covering a range from oligo-/mesotrophic to eutrophic. Although changing …
-
Characterizing Plankton communities in Lake Ontario coastal wetlands along an urban land-use gradient
… for its suitability as a candidate wetland for biomanipulation restoration. I found water quality was generally not degraded along the urban gradient as expected. Nutrient rich waters and high chloride concentrations were determined to be important drivers of decreased diversity and higher algal …
-
Trophic Level Changes and Alewife Predation on Conesus Lake
… population and poorer water quality. Attempts at biomanipulation were begun in 1985 with yearly stockings of 65,000 3-5 cm walleye fingerlings. While these fingerling plantings were not successful, nevertheless alewife in Conesus Lake declined by 41% from 1985 to 1988. A likely cause for this …
-
Bottom-up gesteuerte Anpassungen von Daphnia galeata an die Nahrungsbedingungen in der biomanipulierten Talsperre Bautzen
… um die Effizienz der top-down Steuerung (Biomanipulation) als ökotechnologische Maßnahme zur Gewässersanierung zu erhöhen. Dazu wurden in der biomanipulierten Talsperre Bautzen in drei Untersuchungsjahren (1997 - 1999) wichtige bottom-up wirkende Steuerfaktoren der Daphnienentwicklung …
-
Species-oriented model approaches to Daphnia spp.: linking the individual level to the population level
… z.B. im Rahmen einer Nahrungskettenmanipulation (Biomanipulation), von großem Interesse. Ihre relativ einfache Kultivierbarkeit machte sie außerdem zu einen weit verbreiteten Modellorganismus limnologischer Grundlagenforschung. Das Ziel dieser Arbeit besteht darin, ein umfassendes Modellsystem für …
-
Verteilung und Ernährung larvaler und juveniler Stadien von Plötze (Rutilus rutilus (L.)) und Barsch (Perca fluviatilis L.) im Biomanipulationsexperiment Feldberger Haussee (Mecklenburg-Vorpommern)
… an Barschen war in diesem Gewässer im gesamten Biomanipulationszeitraum sehr gering (< 1% der Gesamtfischbiomasse). Längerfristig stabilisiert, aus wissenschafticher Sicht, eine hoher Bestand an piscivoren Barschen die Effekte der Biomanipulation. Ziel der Untersuchung war daher die …
-
Food Habits and Consumption Estimates of Walleyes Stocked as a Tool to Suppress Fathead Minnow Populations in West-Central Minnesota Wetlands
… Thus, stocking age-0 walleyes was an effective biomanipulation tool that substantially reduced prey fish densities, and likely influenced lower trophic levels in these aquatic communities.
-
Freshwater Mussels as Biofilters
… ditches to assess their potential use in the biomanipulation of these ditches. Although mussels suffered high mortality in two ditches, in the third ditch 70% of mussels survived, and the section of ditch containing mussels remained clear of floating macrophytes throughout the summer. However, …
-
The role of zooplankton in cyanobacteria bloom development in Australian reservoirs
… implications, this thesis has demonstrated that biomanipulation by increasing zooplankton abundance in reservoirs of subtropical Queensland where calanoid copepods are dominant would not be very effective. Based on the data collected and the major findings, recommendations are made for …
-
Dynamik und Energietransfer einer planktischen Crustaceengemeinschaft in Abhängigkeit von der Nahrungsgrundlage und den Planktivoren
Ziel der Arbeit war es, die Hypothese von CARNEY & ELSER (1990), dass unter mesotrophen Bedingungen die trophische Transfereffizienz vom Phytoplankton zum Crustaceenplankton maximal ist, in einem Ganz-Seen-Experiment zu überprüfen. Die Untersuchungen erfolgten im Rahmen des Projektes …
-
Population dynamics of Daphnia galeatat in the biomanipulated Bautzen Reservoir: life history strategies against food deficiency and predation
The population dynamics and demography of Daphnia galeata was analysed in a five year study in the biomanipulated Bautzen Reservoir. Samples were taken two times a week during the period May-July in the pelagic zone of this highly eutrophic water. Major bottom-up and top-down factors were …
-
Dominanzverhältnisse, Interaktionen und räumliche Verteilung von Barsch, Plötze und Seeforelle in der mesotrophen Talsperre Saidenbach
… und der Umsteuerungsphase bezüglich biomanipulationsbedingter Effekte, um einen späteren Vorher-Nachher-Vergleich innerhalb des Ganzseenexperimentes zu ermöglichen. Andererseits sollte untersucht werden, ob die Hypothese des konkurrenzbedingten juvenilen Flaschenhalses der Barsche …