Post-bottleneck inbreeding accumulation reduces fitness in laboratory populations of <italic>Tribolium castaneum</italic> under environmental stress

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dc.contributor.advisorSiewerdt, Franken_US
dc.contributor.authorChoiniere, Ashley Danielleen_US
dc.contributor.departmentAnimal Sciencesen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2009-03-24T05:37:10Z
dc.date.available2009-03-24T05:37:10Z
dc.date.issued2008en_US
dc.description.abstractPopulations are often driven to extinction due to low genetic diversity. One major cause for loss of genetic diversity in a population is a demographic bottleneck. A demographic bottleneck was imposed on twenty-one populations of <italic>Tribolium castaneum</italic> using multiple strategies. After recovering to original census numbers, the populations were subjected to stressful environments, and fitness was quantified. There was a significant decrease in additive genetic variance in all populations as a result of the bottleneck event (P<0.05). As estimated inbreeding accumulation increased, there was a decrease in the mean of fitness related traits, such as adult weight, total progeny, fecundity and survivorship. This relationship was best explained using quadratic models and became even more significant when the populations were under stress. This suggests that both dominance and epistatic gene effects are playing a role in phenotypic expression of traits and that expression may be flexible, supporting survival and fitness.en_US
dc.format.extent328425 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/8986
dc.language.isoen_US
dc.subject.pqcontrolledBiology, Geneticsen_US
dc.subject.pqcontrolledBiology, Generalen_US
dc.subject.pqcontrolledBiology, Ecologyen_US
dc.subject.pquncontrolledadaptationen_US
dc.subject.pquncontrolledbottlenecken_US
dc.subject.pquncontrolledevolutionen_US
dc.subject.pquncontrolledfitnessen_US
dc.subject.pquncontrolledgenetic varianceen_US
dc.subject.pquncontrolledinbreeding depressionen_US
dc.titlePost-bottleneck inbreeding accumulation reduces fitness in laboratory populations of <italic>Tribolium castaneum</italic> under environmental stressen_US
dc.typeThesisen_US

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