Systematics, molecular evolution, and phylogeography of Steller sea lions, Eumetopias jubatus
Abstract
Exploring intraspecific diversity and divergences and testing hypotheses which endeavor to explain these observed levels of diversity within and among populations is a key component of evolutionary biology. By describing the variation of characters over a species distribution and testing these patterns in light of information on biotic and abiotic processes, we should gain insight into the origin and maintenance of observed patterns. In this dissertation data on Steller sea lions, Eumetopias jubatus, is presented with this intent. A survey on patterns of morphological variation in conjunction with genetic and demographic data is used to provide a clear taxonomic description of E. jubatus. An investigation about the molecular evolution of a commonly used genetic locus is also presented to characterize substitution processes at this locus that when unchecked can lead to inaccurate interpretations of population structure. In addition, the phylogeographic history of E. jubatus is described in which major patterns of population structure are explainable by the role climate change over the last 400,000 years has had in continually modifying the distribution of available habitat. Collectively, these results provide an accurate depiction of the evolutionary history and current population structure of E. jubatus.
Degree
Ph.D.
Advisors
Bickham, Purdue University.
Subject Area
Molecular biology|Genetics|Evolution and Development
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