• Login
    View Item 
    •   Home
    • University of Alaska Fairbanks
    • UAF Graduate School
    • Geosciences
    • View Item
    •   Home
    • University of Alaska Fairbanks
    • UAF Graduate School
    • Geosciences
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Scholarworks@UACommunitiesPublication DateAuthorsTitlesSubjectsTypeThis CollectionPublication DateAuthorsTitlesSubjectsType

    My Account

    Login

    First Time Submitters, Register Here

    Register

    Statistics

    Display statistics

    Evidence for the presence of mesic herbaceous shrub tundra with isolated stands of trees in south central Beringia during glacial stages 2 - 16

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Morris_E_2018.pdf
    Size:
    18.43Mb
    Format:
    PDF
    Download
    Author
    Morris, Emily P.
    Chair
    Fowell, Sarah
    Committee
    Bigelow, Nancy
    Wooller, Matthew
    Keyword
    Tundra plants
    Bering Land Bridge
    Tundras
    Palynology
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/9680
    Abstract
    Palynological analysis of assemblages from the Integrated Ocean Drilling Program (IODP) Expedition 323, Bering Sea Expedition, site U1343, located in deep water adjacent to the Bering Sea shelf edge, permit reconstruction of the terrestrial vegetation of the southern margin of central Beringia. Previous research done by Rachel Westbrook on marine isotope stages (MIS) 1-6 indicates that the southern coast of central Beringia was a glacial refugium for boreal forest vegetation. This study extends and augments Westbrook's research by analyzing additional samples from IODP site U1343 spanning the last 258 - 615.3 kya, during glacial stages 8, 10, 12, 14, and 16. Grass (Poaceae) and sedge (Cyperaceae) pollen dominate the assemblages with small but persistent amounts of boreal forest taxa, such as alder (Alnus), birch and dwarf birch (Betula and Betula nana), and spruce (Picea). A set of modern surface samples forming a transect from the southwestern margin of the Bering Sea shelf to Nome, AK were obtained and analyzed as potential modern analogs for the palynofloral assemblages from site U1343. Low percentages of boreal forest taxa in nearshore samples from this Bering Sea shelf transect reflect the vegetation of the coastal Seward Peninsula and the Yukon/Kuskoskim delta, regions dominated by herbaceous tundra with isolated stands of trees. Comparison of modern and fossil assemblages via canonical community ordination indicates that the IODP samples from site U1343 and modern samples from the Bering Sea shelf are most similar to surface samples from lakes and bogs surrounded by moist herbaceous/shrub tundra. These data suggest that boreal forest taxa persisted throughout MIS 8, 10, 12, 14, and 16 on the southcentral Beringian coast, where the vegetation was primarily moist herbaceous/shrub tundra with intermittent stands of trees.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2018
    Date
    2018-08
    Type
    Thesis
    Collections
    Geosciences

    entitlement

     
    ABOUT US|HELP|BROWSE|ADVANCED SEARCH

    The University of Alaska Fairbanks is an affirmative action/equal opportunity employer and educational institution and is a part of the University of Alaska system.

    ©UAF 2013 - 2023 | Questions? ua-scholarworks@alaska.edu | Last modified: September 25, 2019

    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.