Sökning: "non-lethal effects"

Visar resultat 1 - 5 av 11 avhandlingar innehållade orden non-lethal effects.

  1. 1. Predator-prey interactions in freshwater systems: The importance of chemical communication

    Författare :Kajsa Åbjörnsson; Enhet akvatisk ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; marine biology; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi; Ecology; Ekologi; Hydrobiology; trophic cascades; non-lethal effects; benefits; costs; heredity; predator experience; alarmsubstances; dietary cues; amphibian larvae; invertebrates; visibility; fish; behaviour; Predator-prey; chemical cues;

    Sammanfattning : 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. LÄS MER

  3. 2. The Invasion of the Zebra Mussel - Effects on Phytoplankton Community Structure and Ecosystem Function

    Författare :Rahmat Naddafi; Kurt Pettersson; Peter Eklöv; Willem Goedkoop; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Invasive species; Zebra mussel; Invasion success; Selective feeding; Non-lethal effects of predator; Seston stoichiometry; Delayed fluorescence excitation spectroscopy; Phytoplankton dynamics; Trait-mediated indirect interaction; Ecosystem function;

    Sammanfattning : Biological invasion has become a major threat to economy, ecology, global biodiversity and ecosystem function of aquatic ecosystems. The main aim of the thesis was to study the effects of the zebra mussel (Dreissena polymorpha), a versatile invasive species, on phytoplankton dynamics and ecosystem function of lakes. LÄS MER

  4. 3. Predation and shorebirds: predation management, habitat effects and public opinions

    Författare :Daniel Isaksson; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Conservation; waders; predation; coastal pastures; redshank; lapwing; attitudes; human dimensions;

    Sammanfattning : Many shorebird populations are rapidly declining and a high nest predation rate is one of the threats facing these populations. Thus, factors that affect predation and how to manage it in an effective way are receiving increased attention. LÄS MER

  5. 4. Neurotropic influenza A virus infection in the mouse brain : targeting, persistence and functional effects

    Författare :Fredrik Aronsson; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Influenza A virus; nervous system;

    Sammanfattning : Viral infections of the central nervous system have been associated with sensory, motor and behavioral disturbances both in humans and in animals. An example of this is influenza A virus infection that causes acute respiratory diseases, which occasionally are followed by complications from the central nervous system. LÄS MER

  7. 5. Effects of starvation and haemorrhage on the large bowel coliform flora with special reference to bacterial mucosal adherence and translocation

    Författare :Carl-Gustaf Nettelbladt; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Bacterial translocation; plasma refill; starvation; haemorrhage; coliforms; Escherichia coli; biochemical fingerprinting; bulking fibre.;

    Sammanfattning : Intestinal bacteria translocating to extra-intestinal sites have been suggested to play a role in the etiology of posttraumatic infections and multiple organ failure. In the present study, effects of haemorrhagic stress and /or starvation on the gut flora and bacterial translocation were studied in the rat. LÄS MER