Search for dissertations about: "Tobias Vrede"
Found 4 swedish dissertations containing the words Tobias Vrede.
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1. The role of crustacean zooplankton in pelagic nutrient cycling
Abstract : Herbivorous crustacean zooplankton link phytoplankton and other microorganisms withhigher trophic levels in pelagic food webs. Crustaceans show little intraspecificvariation in somatic C:N:P elemental ratios, which may have implications for theregulation of zooplankton growth and for nutrient cycling. READ MORE
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2. Productivity and carbon transfer in pelagic food webs in response to carbon, nutrients and light
Abstract : Some of the major problems we face today are human induced changes to the nitrogen (N), phosphorus (P) and carbon (C) cycles. Predicted increases in rainfall and temperature due to climate change, may also increase dissolved organic matter (DOM) inflows to freshwater ecosystems in the boreal zone. READ MORE
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3. Food Quality Effects on Zooplankton Growth and Energy Transfer in Pelagic Freshwater Food Webs
Abstract : Poor food quality can have large negative effects on zooplankton growth and this can also affect food web interactions. The main aims of this thesis were to study the importance of different food quality aspects in Daphnia, to identify potentially important differences among zooplankton taxa, and to put food quality research into a natural context by identifying the importance of food quality and quantity in lakes of different nutrient content. READ MORE
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4. The role of terrestrial and phytoplankton-derived organic matter in planktonic food webs
Abstract : Lakes are important global ecosystems and many of them are nutrient-poor (unproductive). Especially in northern boreal latitudes, lakes may be heavily subsidized by terrestrial organic material (t-OM) from peat layers in the catchment. READ MORE