Search for dissertations about: "fluctuating populations"

Showing result 1 - 5 of 19 swedish dissertations containing the words fluctuating populations.

  2. 1. Population Dynamics and Conservation of the Sand Lizard (Lacerta agilis) on the Edge of its Range

    Author : Sven-Åke Berglind; Pekka Pamilo; Per Sjögren-Gulve; Coulson Tim; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; demography; extinction; habitat; Lacerta agilis; management; metapopulation; peripheral populations; population dynamics; population viability analysis; reintroduction; reptiles; umbrella species; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi;

    Abstract : The sand lizard (Lacerta agilis) reaches the northern periphery of its distribution in south-central Sweden, where small, isolated relict populations occur in pine heath forests on sandy sediments. Modern forestry and fire suppression have reduced the amount of suitable open habitat for the species in this area and seem to be important for its decline. READ MORE

  4. 2. Life histories and population dynamics

    Author : Annie Jonsson; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : During the last decades there has been a growing interest and attention to random variation in population densities and their causes. It has been shown that even in constant environments (deterministic population growth) the dynamics of populations can display random like behaviour depending on parameter values. READ MORE

  5. 3. Quo vadis? Insights into the determinants of evolutionary dynamics

    Author : Alexandre Rêgo; Rike Stelkens; Dmitri Petrov; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; natural selection; selection; genetic drift; evolutionary rescue; historical contingency; adaptation; complex environments; evolutionary predictability; parallel evolution; populationsgenetik; Population Genetics;

    Abstract : Predicting future evolutionary outcomes and explaining past and current patterns of biodiversity are fundamental goals in evolutionary biology. Trajectories of evolving populations are determined by evolutionary mechanisms (natural selection, mutation, genetic drift, and gene flow) and the environment in which the populations are found. READ MORE

  6. 4. Satellite observations of auroral acceleration processes

    Author : Lars Eliasson; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Aurora; particle acceleration; space plasma; magnetosphere; ionosphere; polar cap; satellite observations;

    Abstract : Measurements with satellite and sounding rocket borne instruments contain important information on remote and local processes in regions containing matter in the plasma state. The characteristic features of the particle distributions can be used to explain the morphology and dynamics of the different plasma populations. READ MORE

  7. 5. Population fluctuations and life history consequences in the arctic fox

    Author : Magnus Tannerfeldt; David Macdonald; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; Biologi; zoologisk ekologi; Animal Ecology;

    Abstract : In this thesis, I describe and explain drastic population fluctuations in the arctic fox Alopex lagopus (L.). I proceed to examine evolutionary consequences of unpredictable fluctuations in terms of life history strategies. In fluctuating populations, the risks and benefits of different behaviours vary with changes in population density. READ MORE