Sökning: "Wild salmon"

Visar resultat 1 - 5 av 17 avhandlingar innehållade orden Wild salmon.

  1. 1. The spawning salmon as a resource by recreational use : the case of the wild Baltic salmon and conditions for angling in north Swedish rivers

    Författare :Håkan Appelblad; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Baltic salmon; Wild salmon; Angling; Fishing tourists; Natural resource; Upper Norrland; Sweden; Social and Economic Geography; kulturgeografi;

    Sammanfattning : The aim of the thesis is to analyse the preconditions for increasedsalmon angling in the remaining wild salmon rivers in Upper Norrland in northernSweden, as well as to evaluate the present and possible future impacts on the localeconomy. It includes the identification of the internal and external conditions, in what ishere called the Salmon Utilisation Landscape, that influence the present use as well asfuture development of the Baltic salmon as a resource in angling. LÄS MER

  3. 2. Migration and quality of landlocked Atlantic salmon smolt : Implications for conservation and management

    Författare :Johnny R Norrgård; Eva Bergman; Larry A Greenberg; Monika Schmitz; Martyn Lucas; Karlstads universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; acoustic telemetry; hatchery; life history; migration mortality; regulated rivers; Salmo salar; salmon; smolt; trout; Biology; Biologi;

    Sammanfattning : Atlantic salmon Salmo salar has a complex life cycle, including long migrations and habitat shifts for both juveniles and adults. As such, salmon populations are vulnerable to habitat degradation and fragmentation along their migratory routes. LÄS MER

  4. 3. Cost-Benefit Analysis and Valuation Uncertainty : Empirical contributions and methodological developments of a study on trade-offs between hydropower and wild salmon

    Författare :Cecilia Håkansson; SLU Department of Forest Economics; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; classic and interval open-ended question; contingent valuation; cost-benefit analysis; hydropower; salmon; valuation uncertainty;

    Sammanfattning : .... LÄS MER

  5. 4. Age-class interactions in Atlantic salmon and brown trout: Effects on habitat use and performance

    Författare :Rasmus Kaspersson; Göteborgs universitet; []
    Nyckelord :competition; inter-cohort; density-dependence; growth; habitat; Salmo trutta; Salmo salar; salmon; trout;

    Sammanfattning : This thesis investigates the underlying mechanisms and the density-regulatory effects of age-class interactions, using juvenile Atlantic salmon (Salmo salar L.) and brown trout (Salmo trutta L.) as study species. LÄS MER

  7. 5. Evolution and Ecology of AhR genes in Atlantic salmon (Salmo salar L.)

    Författare :Maria Hansson; Biodiversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; AhR genes; Atlantic salmon; gene evolution; phylogenetics; environmental pollutants; Baltic Sea; ecotoxicology; Animal ecology; Djurekologi;

    Sammanfattning : In vertebrates, studies of the aryl hydrocarbon receptor (AhR) have been of particular interest due to its direct involvement in the toxic effects exerted by several environmental pollutants, such as PCB and dioxin. After binding to the toxic molecule, this receptor initiates transcription of several genes that are part of the biotransformation battery but most notably the cytochrome P450 (CYP) genes, which results in an excessive release of oxidative enzymes and free radicals. LÄS MER