Search for dissertations about: "postzygotic isolation"

Showing result 1 - 5 of 6 swedish dissertations containing the words postzygotic isolation.

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

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Nina Svedin; Uppsala universitet.; [2006]
    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

  2. 2. Speciation - What Can be Learned from a Flycatcher Hybrid Zone?

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Chris Wiley; Uppsala universitet.; [2006]
    Keywords : Biology; speciation; reinforcement; fitness; postzygotic isolation; asymmetrical hybridization; hybrid zone; species recognition; mate choice; sexual selection; direct benefits; parasite resistance; delayed plumage maturation; Ficedula hypoleuca; Ficedula albicollis; flycatcher; Biologi;

    Abstract : Studies of hybrid zones offer important insights into the process of speciation. Much of the knowledge to be gained is dependent on an accurate estimation of the strength of pre- and post-zygotic isolation between hybridizing taxa. My results demonstrate that hybridization can variously affect different components of fitness. READ MORE

  3. 3. Speciation and Metabolic rate Insights from an avian hybrid zone

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : S. Eryn McFarlane; Uppsala universitet.; [2017]
    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

  4. 4. Mechanisms of speciation in Silene

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Xiaodong Liu; Uppsala universitet.; [2018]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; speciation; reproductive isolation; Silene; ddRAD-seq; Biology with specialization in Evolutionary Genetics; Biologi med inriktning mot evolutionär genetik;

    Abstract : A fundamental question in the field of evolutionary biology is how new species originate. Investigating speciation benefits from an integrated approach, which requires a solid understanding of ecology, reproductive biology, geographical distribution, underlying genetic architecture of reproductive isolation (RI), demographic history and genomic divergence. READ MORE

  5. 5. Genetics and the Origin of Two Flycatcher Species

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Thomas Borge; Uppsala universitet.; [2004]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; reinforcement; reproductive isolation; Z chromosome; hybridization; mate-choice; single nucleotide polymorphism; sequence variation; sexual selection; recombination; Biologi; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi;

    Abstract : In this thesis, different genetic tools are used to investigate pre- and postzygotic barriers to gene exchange and their role in speciation in the pied flycatcher (Ficedula hypoleuca) and the collared flycatcher (F. albicollis). This species complex consists of four genetically distinct clades that apparently diverged in allopatry (I). READ MORE