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    Phylogeography and population genetics of a Beringian endemic: Dallia (Esociformes: Teleostei)

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    Author
    Campbell, Matthew A.
    Chair
    López, J. Andrés
    Takebayashi, Naoki
    Committee
    Olson, Matthew
    Keyword
    Dallia
    Alaska
    genetics
    Dallia pectoralis
    Russia
    Siberia
    Russian Far East
    Saint Lawrence Island
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/11331
    Abstract
    In this thesis I examine the population genetics of an endemic Beringian freshwater fish genus, Dallia (blackfish). The current distribution of blackfish was heavily influenced by paleoclimatic instability during the Pleistocene. Beringian paleoclimatic changes during the Pleistocene included the fluctuating growth and decline of glaciers and an overall decrease in temperature and increased aridity in areas not adjacent to the Bering Sea. Pleistocene glacial advances resulted in the cyclical emergence of the Bering land bridge. The effects of paleoclimatic instability on blackfish distribution and abundance can be inferred through the distribution of genetic variation across the Beringian landscape. I address three basic questions: 1: Are separate populations of blackfish taxonomically distinct entities? I found that while there is clear genetic structuring and isolation, there is insufficient information to make a strong statement in this regard. 2: Did blackfish survive Pleistocene glaciations within multiple Beringian refugia? My results indicate that blackfish persisted in at least four broad geographic areas. 3: How did the Bering land bridge influence intercontinental aquatic interchange? My evidence points to close genetic relationships and potentially high exchange of blackfish across the Bering land bridge, which supports the Bering land bridge as conduit for freshwater aquatic migration.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2011
    Table of Contents
    1. Introduction -- Blackfish -- Scientific classification and relationships to other fishes -- History of blackfish in Beringia -- Thesis research and organization -- References -- 2. Mitochondrial phylogeography of a Beringian endemic: Dallia -- Abstract -- Introduction -- Materials and methods -- Results -- Discussion -- Acknowledgements -- References -- 3. Population genetics of Dallia in Beringia -- Abstract -- Background -- Methods -- Results -- Discussion -- Conclusions -- Authors' contributions -- Acknowledgements -- References -- 4. Conclusion.
    Date
    2011-08
    Type
    Thesis
    Collections
    Biological Sciences

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