Sökning: "Jacob Johansson"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden Jacob Johansson.

  1. 1. Evolving ecological communities in changing environments

    Författare :Jacob Johansson; Evolutionär ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; adaptive dynamics; competition; community evolution; ecological communities; environmental change; evolutionary branching;

    Sammanfattning : This thesis consists of theoretical studies of the evolutionary consequences of environmental change in ecological communities. Paper I and II are concerned with the origin of diversity, i.e. how a single lineage can split into two, under the influence of selection induced by competitive interactions (evolutionary branching). LÄS MER

  3. 2. Drivers of polymorphism dynamics in pygmy grasshoppers

    Författare :Jenny Johansson; Anders Forsman; Jacob Höglund; Linnéuniversitetet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Evolutionary Biology; Evolutionsbiologi;

    Sammanfattning : In this thesis, I used colour polymorphism in pygmy grasshoppers as a model system to study the influence of selection, developmental plasticity, mating behaviour and gene flow on patterns of phenotypic and genetic diversity within and among populations in changing environments.Data for more than 5,000 individuals collected from natural populations showed that the incidence of black (melanic) pygmy grasshoppers was higher in burnt than in non-burnt areas, and rapidly declined over time within populations in post-fire environments. LÄS MER

  4. 3. Biopolitics and Reflexivity : A Study of GMO Policymaking in the European Union

    Författare :Anders Johansson; Thomas Achen; Sven Widmalm; Stellan Welin; Jacob Dahl; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; GMO; genetically modified organism; precautionary principle; risk biopolitics; policy; European Union; EU; reflexivity; reflexive modernity; GMO; genetiskt modifierade organismer; försiktighetsprincipen; risk biopolitik; policy; Europeiska Unionen; EU; reflexivitet; reflexiv modernitet; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : The political discourse that has emerged as a consequence of establishing a European regulatory framework for GMOs has not been without problems. This dissertation addresses the political and regulatory challenges created by the development and use of genetically modified organisms (GMOs) in the EU. LÄS MER

  5. 4. Novel Algorithms for Optimal Transport via Splitting Methods

    Författare :Jacob Lindbäck; Mikael Johansson; Jérôme Malick; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; optimal transport; splitting methods; Optimeringslära och systemteori; Optimization and Systems Theory;

    Sammanfattning : This thesis studies how the Douglas–Rachford splitting technique can be leveraged for scalable computational optimal transport (OT). By carefully splitting the problem, we derive an algorithm with several advantages. LÄS MER

  7. 5. Den nationella drömträdgården : den stora berättelsen om den egna nationen i svensk och brittisk Europadebatt

    Författare :Jacob Westberg; Karl Magnus Johansson; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; European Union attitudes; European integration; Neutralitetspolitik; historia; Folkhemmet; Integration; Research on Europe;

    Sammanfattning : .... LÄS MER