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Differences in age at breeding between two genetically different populations of brown trout (Salmo trutta).
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Statistics.
2019 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Survival analysis is an effective tool for conservation studies, since it measure the risk of an event that is important for the survival of populations and preservation of biodiversity. In this thesis three different models for survival analysis are used to estimate the age at breeding between two genetically different populations of brown trout. These populations are an evolutionary enigma, since they apparently coexist in direct competition with each other, which according to ecological theory should not happen. Thus it is of interest if differences between them can be identified. The data consists of brown trouts and has been collected over 20 years. The models are the Cox Proportional Hazards model, the Complementary Log-Log Link model and the Log Logistic Accelerated Failure-Time model. The Cox model were estimated in three different ways due to the nonproportional hazards in the estimates of time to breeding, which gave different interpretations of the same model. All of the models agree that the population B breed at younger ages than the population A, which suggests that the two populations have different reproductive strategies.

Place, publisher, year, edition, pages
2019. , p. 52
Keywords [en]
Survival analysis, Biodiversity, Population genetics, Ecology, Evolutionary biology, Cox Proportional Hazards model, Complementary Log-Log Link model, Accelerated Failure-Time model
National Category
Probability Theory and Statistics
Identifiers
URN: urn:nbn:se:uu:diva-388613OAI: oai:DiVA.org:uu-388613DiVA, id: diva2:1334286
External cooperation
zoologiska institutionen, Stockholms Universitet
Presentation
2019-06-03, B 105, Ekonomikum, Uppsala, 10:25 (English)
Supervisors
Examiners
Available from: 2019-07-02 Created: 2019-07-02 Last updated: 2019-07-02Bibliographically approved

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CiteExportLink to record
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