Sökning: "anpassningar"

Visar resultat 1 - 5 av 76 avhandlingar innehållade ordet anpassningar.

  1. 1. Migratory behaviour and adaptive divergence in life-history traits of pike (Esox lucius)

    Författare :Petter Tibblin; Per Larsson; Anders Forsman; Asbjørn Vøllestad; Linnéuniversitetet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; conservation; evolution; homing; local adaptation; management; phenotypic variation; population divergence; selection; sympatric;

    Sammanfattning : Population divergence shaped by natural selection is central to evolutionary ecology research and has been in focus since Darwin formulated “The origin of species”. Still, the process of adaptive divergence among sympatric populations is poorly understood. LÄS MER

  3. 2. Migration strategies of raptors – spatio-temporal adaptations and constraints in travelling and foraging

    Författare :Roine Strandberg; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; route convergence; loop migration; mortality; spatio-temporal distribution patterns; pre- and post-migratory movements; daily travel routines; satellite tracking; fly-and-forage migration; raptors;

    Sammanfattning : My dissertation is about bird migration and addresses questions about how raptors adapt to the fluctuating environments during the transition seasons between breeding and wintering. The migration is highly affected by local prey abundance, foraging strategies, weather conditions and landscape patterns along the migration routes as well as navigation and orientation mechanisms and cues. LÄS MER

  4. 3. Phenotypic and genetic adaptations to a new host plant : Ecological divergence of a specialist insect

    Författare :Kalle Nilsson; anpassning och samevolution Artbildning; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; ecological speciation; persistence of ecological adaptations; host plant shift; genomic landscape; genomic inversion; parallelism; evolvability; reproductive barriers; Tephritis;

    Sammanfattning : Divergent ecological adaptation resulting from selection is common, but how often it results in differentiation that can last in the face of gene flow is debated. Reproductive barriers persistent to stochastic environmental change are key for species to form. LÄS MER

  5. 4. Neurons against Noise : Neural adaptations for dim light vision in hawkmoths

    Författare :Anna Stöckl; Funktionell zoologi; []
    Nyckelord :vision; insect; hawkmoth; motion vision; spatial and temporal summation; dim light; neural processing;

    Sammanfattning : All animals perceive the world through their senses, which form the basis for their decisions and motor actions. However, when these all-important senses reach their limit and cease to provide reliable information, the animal’s survival is threatened. LÄS MER

  7. 5. Genomic analyses of migratory divides in the willow warbler

    Författare :Max Lundberg; MEMEG; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : In many species of birds juveniles migrate independently of experienced adults and thus have to rely on innate information about migratory routes and wintering area. This information is encoded as a set of inherited migratory directions and a timing schedule that provides information on when and how far to migrate. LÄS MER