Search for dissertations about: "Johan Watz"

Found 2 swedish dissertations containing the words Johan Watz.

  1. 1. Salmonid behaviour under winter conditions

    University dissertation from Karlstad : Karlstads universitet

    Author : Johan Watz; Karlstads universitet.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; climate change; drift; energy budget; foraging; grayling; ice cover; lotic; metabolic rate; predation; salmon; stream; stress; temperature; trout; Biology; Biologi;

    Abstract : Winter conditions are believed to play an important role in the population dynamics of northern temperate stream fish, challenging the ability of fish to physiologically and behaviourally adapt. Climate change is predicted to increase both mean temperature and temperature fluctuations, especially during winter, leading to dynamic environmental conditions in terms of river ice production and flow. READ MORE

  2. 2. Winter behaviour of stream salmonids: effects of temperature, light, and ice cover

    University dissertation from Karlstad : Karlstads universitet

    Author : Johan Watz; Karlstads universitet.; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; stream salmonids; winter behaviour; efftect of temperatur; light; ice cover; environment; fish populations; Biology; Biologi;

    Abstract : In boreal streams, stream salmonids typically face low water temperatures and variable ice conditions during winter, and thus stream salmonids are expected to use different behavioural strategies to cope with these environmental conditions. The studies presented in this thesis explore how temperature, light intensity, and surface ice affect salmonid behaviour, with focus on drift-feeding and ventilation rates. READ MORE