Sökning: "ecosystems"

Visar resultat 1 - 5 av 520 avhandlingar innehållade ordet ecosystems.

  1. 1. Fish on drugs behaviour modifying contaminants in aquatic ecosystems

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Annelie Lagesson; Umeå universitet.; [2018]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Aquatic ecosystems; Behavioural effects; Ecotoxicology; Endocrine disruptors; Pharmaceuticals; Interaction effects; ekotoxikologi; Ecotoxicology;

    Sammanfattning : Contamination of surface waters is a worldwide problem. One group of emerging contaminants that reach aquatic ecosystems via sewage treatment plant effluents and agricultural run-offs is pharmaceuticals. LÄS MER

  2. 2. Managing Platform-Mediated Ecosystems Investigating ecosystem interdependencies and strategic choices

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Javier Cenamor; Luleå tekniska universitet.; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Entreprenörskap och innovation; Entrepreneurship and Innovation;

    Sammanfattning : The rapid and ubiquitous spread of information technologies (IT) is creating unprecedented effects that challenge traditional fundamentals of the business world. Platform-mediated ecosystems are increasingly attracting the attention of practitioners from diverse industries, from telecommunications to video consoles, as well as academics from different fields ranging from management to economics, and information systems (IS) and innovation management. LÄS MER

  3. 3. Conflicts in Information Ecosystems

    Detta är en avhandling från Ronneby : Blekinge Institute of Technology

    Författare :Bengt Carlsson; Blekinge Tekniska Högskola.; [2001]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Multiagentsystem; Informationsekosystem; Spelteori; Antagonistiska grupper;

    Sammanfattning : The main topic of this thesis concerns the study of how conflicting interests of software agents within an information ecosystem may cause cooperative behavior. Since such agents act on the behalf of their human owners, which often act in their own interest, this will sometimes result in malignant acts. LÄS MER

  4. 4. Herbivores influence nutrient cycling and plant nutrient uptake insights from tundra ecosystems

    Detta är en avhandling från Umeå : Umeå University

    Författare :Hélène Barthelemy; Umeå universitet.; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Reindeer grazing; large herbivores; nutrient cycling; plant nutrient uptake; soil nutrient availability; arctic plant ecology; soil microbial communities; 15N stable isotopes; plant-soil interactions; plant quality; dung and urine.; Environmental Science; miljövetenskap; biology; biologi;

    Sammanfattning : Reindeer appear to have strong positive effects on plant productivity and nutrient cycling in strongly nutrient-limited ecosystems. While the direct effects of grazing on vegetation composition have been intensively studied, much less is known about the indirect effect of grazing on plant-soil interactions. LÄS MER

  5. 5. Dynamics of omnivorous crayfish in freshwater ecosystems

    Detta är en avhandling från Tryckeriet i E-huset, Lunds universitet

    Författare :Karin Olsson; Lund University.; Lunds universitet.; [2008]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; crayfish; freshwater ecosystems; niche width; growth rate; stable isotope analysis; recruitment; RNA:DNA analysis; Ecology; food availability and quality; trophic position; population dynamics;

    Sammanfattning : In this thesis I examine the dynamics of crayfish in streams and lakes. I have studied the influence of abiotic and biotic factors on abundance, growth, trophic position, niche breadth, and recruitment of crayfish, by conducting field studies, an outdoor channel experiment and timeseries analysis. LÄS MER