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    Investigating ancient bison migration in Alaska: a bottom up approach using isotopes

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    Author
    Funck, Juliette Marie
    Chair
    Wooller, Matthew
    Committee
    Druckenmiller, Patrick
    Hundertmark, Kris
    Ruether, Joshua
    Keyword
    wood bison
    nutrition
    Alaska
    steppe bison
    migration
    ecology
    genome mapping
    home range
    stable isotopes
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/11265
    Abstract
    Once abundant in the Arctic, bison (Bison bison) declined almost to extinction in the North but have subsequently been reintroduced into Alaska. The predecessors of these modern bison were the ancient steppe bison (Bison priscus), which were abundant throughout the Northern Hemisphere before their extinction during the Holocene. This thesis investigates the ecology and landscape-use of both the present-day wood bison (Bison bison athabascae) and the ancient steppe bison in Alaska using stable isotopes, among other methods. The stable carbon and nitrogen isotope compositions of animal tissues are traditionally used to investigate diet. However, this thesis uses the isotope composition of tail hairs from present day wood bison as a proxy for their nutritional stress. Nutritional stress of some wood bison appears to be influenced not only by food shortage during hard seasons, but also due to long-distance mobility. This insight provides a key to understanding the challenges of reintroduction of the species into Alaska today, and can also be applied to understand the nutritional stress and cost of dispersal by ancient animals. Whereas the mobility of present-day bison can be tracked using sophisticated satellite tracking technologies, studies of the paleo-mobility of ancient bison rely on isotopic markers such as strontium and oxygen isotope ratios preserved in their teeth. To aid this approach using isotopic geolocation, this thesis creates a map of bioavailable strontium modeled and based on strontium isotope composition of present-day rodent teeth from across Alaska. It then compares this map, together with an existing oxygen isotope map of precipitation in Alaska, with the strontium and oxygen isotopes preserved in a suite of ancient bison from Northern Alaska. This comparison brings to light some of the major habitation regions used by Bison on the North Slope of Alaska over the last ~50,000 years. Finally, these findings subsequently contribute to a detailed paleoecological investigation of a mostly articulated and complete ancient steppe bison found on the North Slope of Alaska. This final study reveals the life-history of an individual bison that dispersed from the coastal plain to the foothills of the Brooks Range early in his life, and shows that the trip was nutritionally costly. This information is combined with a suite of other paleoecological methods to provide a vivid life history of this ancient bison. We introduce new methodologies for studying these ancient animals that seek to bridge the gap between how we study present-day and the past.
    Description
    Dissertation (Ph.D.) University of Alaska Fairbanks, 2020
    Table of Contents
    General introduction -- Chapter 1: Stable isotopic signatures in modern wood bison (Bison bison athabascae) hairs as telltale biomarkers of nutritional stress -- Chapter 2: Rode(ent)-map of bio-available strontium for Beringia: A tool for tracking landscape-use of Pleistocene megafauna in Eastern Beringia -- Chapter 3: A detailed life history from a Pleistocene steppe bison (Bison priscus) skeleton unearthed in Arctic Alaska -- General conclusions -- Works cited.
    Date
    2020-05
    Type
    Dissertation
    Collections
    Geosciences

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