Search for dissertations about: "limnologi akvatisk ekologi limnology Hydrobiology"
Showing result 1 - 5 of 37 swedish dissertations containing the words limnologi akvatisk ekologi limnology Hydrobiology.
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1. Predator-prey interactions in freshwater systems: The importance of chemical communication
Abstract : Predator released chemical cues provide a valuable source of information to prey organisms that can be used to alter their behaviour in order to reduce predation risk. In this thesis, I have examined under what circumstances chemical cues may be used by prey, and if prey discriminate between different cues. READ MORE
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2. Foraging behaviour in benthivorous fish
Abstract : The foraging ability of an organism is essential since it affects various traits, e.g. growth, reproduction effort, social status and, ultimately, fitness. READ MORE
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3. Direct and indirect effects of fish predation and excretion in aquatic food webs
Abstract : The aim of this thesis was to elucidate the mechanisms by which planktivorous fish can affect planktonic communities in lakes and how they may affect benthic communities through their effects on planktonic communities. In a laboratory experiment, nutrients released by fish increased algal biomass and altered phytoplankton community structure, suggesting that fish can affect phytoplankton by directly releasing nutrients. READ MORE
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4. Limitations and possibilities for microbial degradation of organic contaminants in aquifers
Abstract : Many factors can influence the rate of microbial degradation of organic contaminants in aquifers. Some of these factors, e.g. READ MORE
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5. The importance of terrestrial carbon in plankton food webs
Abstract : Allochthonous substances, i.e. produced in terrestrial ecosystems, are known to fuel bacterial production in humic lakes. I observed that allochthonous carbon subsidizes bacteria even at high levels of phytoplankton biomass. READ MORE