Search for dissertations about: "prezygotic isolation"

Found 4 swedish dissertations containing the words prezygotic isolation.

  2. 1. Natural and Sexual Selection in a Natural Hybrid Zone of Ficedula Flycatchers

    Author : Nina Svedin; Anna Qvarnström; Lars Gustafsson; Ian Owens; Uppsala universitet; []
    Keywords : Biology; postzygotic isolation; prezygotic isolation; asymmetrical isolation; sexual signals; hybrid fitness; co-existence; Biologi;

    Abstract : Speciation can be viewed as the formation of reproductive barriers between different populations. This thesis investigates patterns of natural and sexual selection shaping reproductive barriers between two hybridizing flycatchers (i.e. collared – and pied flycatchers). READ MORE

  4. 2. Speciation and Metabolic rate : Insights from an avian hybrid zone

    Author : S. Eryn McFarlane; Anna Qvarnström; Jenny Boughman; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; resting metabolic rate; life history; hybridization; speciation; reproductive isolation; Ficedula flycatcher; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Abstract : The role of divergent climate adaptation in speciation has received surprisingly little scientific attention. My dissertation research focused on how resting metabolic rate (RMR) relates to the build up of prezygotic and postzygotic isolation in a natural Ficedula flycatcher hybrid zone. READ MORE

  5. 3. Evolution of Spur Length in a Moth-pollinated Orchid

    Author : Elin Boberg; Jon Ågren; W. Scott Armbruster; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Platanthera bifolia; floral evolution; natural selection; pollination; spur length; population differentiation; divergent selection; disruptive selection; reproductive isolation; Biology; Biologi; Ecological Botany; Ekologisk botanik;

    Abstract : There is considerable evidence that pollinator shifts can explain many differences in flower morphology between closely related plant species, but the extent to which pollinator shifts can explain the maintenance of among-population variation in floral traits within species is poorly known. In this thesis, I combined comparative and experimental approaches to examine the evolution of floral traits in the moth-pollinated orchid Platanthera bifolia. READ MORE

  6. 4. Trinucleotide repeats and neuropsychiatric phenotypes

    Author : Qiu-Ping Yuan; Karolinska Institutet; Karolinska Institutet; []
    Keywords : Trinucleotide; repeat expansion; psychiatric disorder; gene; spastic paraplegia;

    Abstract : Genetic studies of affective disorders have yielded several chromosomal regions suggestive for linkage. Linkage analysis was performed in five families with unipolar affective disorder, collected from northern Sweden. Four candidate regions on chromosomes 16, 18, 21 and 4p were excluded. READ MORE