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Exploring genetic structure in the dioecious perennial plant Silene dioica using two newly developed methods: Kvantifiering av genetisk struktur hos den dioika, perenna växtarten Silene dioica med hjälp av två nya metoder
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2016 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Kvantifiering av genetisk struktur hos den dioika, perenna växtarten Silene dioica med hjälp av två nya metoder (Swedish)
Abstract [en]

Extinction and recolonization events are expected to give rise to finite population sizes, thus increasing the effects of genetic drift. Genetic drift tends to increase the genetic differentiation among local populations and decrease the genetic variation within local populations. Land uplift and successional processes in the Skeppsvik Archipelago (Sweden) make it possible to estimate the age of Silene dioica island populations and give the unique opportunity to measure how extinction and recolonization influence genetic differentiation. Giles and Goudet (1997) have studied these island populations, and showed that young and old island populations are more differentiated than intermediately aged populations. In this study, neutral allozyme markers collected by Giles and Goudet were studied in order to see if relatively newly developed analyses are able to give further information about the population structures present in these S. dioica island populations. Discriminant Analysis of Principal Components (DAPC) visualized complex genetic structures present in the allozyme data and was used in order to estimate the genetic diversity in each age class. Young and old populations proved to be less diverse than intermediately aged populations. The admixture F model (AFM) was able to separate gene flow and genetic drift responsible for the observed genetic differentiation. Separation of these forces implies that the gene flow is relatively high throughout the archipelago, which suggests that the difference in genetic differentiation among age classes have arisen due to different effective population sizes among the age classes. 

Place, publisher, year, edition, pages
2016. , 20 p.
Keyword [en]
Silene dioica, genetic structure, Admixture F model, Discriminant Analysis of Principal Components, Skeppsvik Archipelago
National Category
Natural Sciences
URN: urn:nbn:se:umu:diva-122252OAI: diva2:937968
Educational program
Bachelor of Science in Biology and Earthscience
Available from: 2016-06-16 Created: 2016-06-16 Last updated: 2016-06-16Bibliographically approved

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