Search for dissertations about: "Barriers to gene flow"

Showing result 1 - 5 of 20 swedish dissertations containing the words Barriers to gene flow.

2. 1. Population divergence at small spatial scales : – theoretical and empirical investigations in perch

   Author : Sara Bergek; Mats Björklund; Teija Aho; Sarah Goodacre; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Perca fluviatilis L.; Perch; Small scale genetic differentiation; Morphometrics; Isolation by distance; Dispersal; Gene flow; Microsatellites; Spatiotemporal stability; Barriers; Biology; Biologi; Terrestrial; freshwater and marine ecology; Terrestrisk; limnisk och marin ekologi; Animal Ecology; zooekologi;

   Abstract : Genetically structured populations arise when gene flow between groups of individuals is hindered by geographical, behavioural or temporal barriers. The identification of such groups is important for understanding evolution and has large implications for conservation concern. READ MORE

4. 2. Physical and biological dispersal barriers in invasive, bloom-forming microalgae

   Author : Ingrid Sassenhagen; Enhet akvatisk ekologi; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Dispersal barriers; microalgae; phenotypic differentiation; population genetics; priority effects;

   Abstract : For a long time microorganisms were assumed to have unlimited dispersal due to their small size and high cell numbers. Most microbial species can be transported by water currents, in water droplets by wind and attached to other organisms. READ MORE

5. 3. Reproductive isolation at contact zones

   Author : Samuel Perini; Göteborgs universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; hybrid zone; gene flow; genetic variants; mating; local adaptation; marine species; speciation;

   Abstract : Speciation is among the most important evolutionary processes that contribute to biodiversity. It involves the formation of new species that have become reproductively isolated through a process that is not linear and varies in time and space. READ MORE

6. 4. Patterns of geographic variation in Silene section Elisanthe (Caryophyllaceae): hybridization and migrational history

   Author : Louise Hathaway; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; chemotaxonomy. Physiology of nonvascular plants; phytogeography; morphology; outbreeding depression; Systematic botany; taxonomy; ITS; fitnes; inbreeding depression; AFLP; PCR-RFLP; cpDNA; gene flow; postglacial migration; geographic variation; hybridization; Silene latifolia; Silene section Elisanthe; Silene dioica; Systematisk botanik; taxonomi; morfologi; kemotaxonomi. Växters fysiologi inte kärlväxter .;

   Abstract : Large-scale patterns of genetic variation in chloroplast (cp) and nuclear DNA in the widespread European herb species Silene latifolia and S. dioica were investigated using cpPCR-RFLPs, non-coding cpDNA sequences, AFLPs and sequences of the internal transcribed spacers (ITS) of nuclear ribosomal DNA (rDNA). READ MORE

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

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

   Abstract : 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. READ MORE