Search for dissertations about: "populations"

Showing result 1 - 5 of 2471 swedish dissertations containing the word populations.

2. 1. Modelling animal populations

   Author : Åke Brännström; Umeå universitet; []
   Keywords : population model; stochastic population model; population dynamics; discrete time model; Beverton-Holt model; Skellam model; Hassell model; Ricker model; first principles; coupled map lattice; CML; area integral; square function; Mathematics; matematik;

   Abstract : This thesis consists of four papers, three papers about modelling animal populations and one paper about an area integral estimate for solutions of partial differential equations on non-smooth domains. The papers are: I. Å. Brännström, Single species population models from first principles. READ MORE

4. 2. Cardiovascular complications following covid-19 : population-based register studies

   Author : Ioannis Katsoularis; Krister Lindmark; Anne-Marie Fors Connolly; Osvaldo Fonseca Rodriguez; Thomas Sandström; Marcus Ståhlberg; Umeå universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; COVID-19; SARS-COV-2; cardiovascular disease; nationwide; register; matched cohort study; self-controlled case series study; cardiovascular disease; hjärt- och kärlforskning; epidemiologi; Epidemiology; Infectious Diseases; infektionssjukdomar;

   Abstract : Background and Aim: COVID-19 is a multiorgan disease and there has been increasing reports of cardiovascular complications. However, previous studies have shown conflicting results and have mainly included hospitalized individuals with severe disease. READ MORE

5. 3. Two-Sex Branching Populations

   Author : Ali Falahati; Göteborgs universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; branching process; martingale; population dynamics; two-sex; bisexual; coupling method; martingale;

   Abstract : We introduce a Two-Sex Galton-Watson Branching Process, to study the dynamics of two-sex populations. It allows individuals to interact with each other in order to form couples (or mating units), and each of these couples produces children for the new generation. READ MORE

6. 4. Evolutionary ecology of arctic char (Salvelinus alpinus (L.)) : Intra- and interspecific interactions in circumpolar populations

   Author : Johan Hammar; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; Arctic char; Salvelinus alpinus; biogeography; niche; life history; population ecology; intra- and interspecific interactions; cannibalism; competition; landlocked; marginal populations; species border; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi; Animal Ecology; zooekologi;

   Abstract : This thesis examines a suite of ecological and genetic mechanisms influencing the fundamental and realized niche borders of European and North American populations of the Arctic char (Salvelinus alpinus (L.)) species complex in allopatry as well as in sympatry with brown trout (Salmo trutta) or brook trout (Salvelinus fontinalis). READ MORE

7. 5. Quantitative genetic variation in declining plant populations

   Author : Maarten Ellmer; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Saxifraga granulata; Briza media; Nigella degenii; bottleneck; Inbreeding depression; founder effects; drift; quantitative genetic; diversifying selection; habitat fragmentation; small populations;

   Abstract : The ecological and genetic effects of habitat fragmentation are an issue of major concern in current conservation biology. Habitat fragmentation results in smaller habitat areas and as a consequence smaller and more isolated populations. Many habitats have become fragmented through human activities such as forestry and agricultural development. READ MORE