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    Lichen Availability on the Range of an Expanding Caribou (Rangifer tarandus) Population in Alaska

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    Name:
    Fleischman_MS_1990_lichens caribou ...
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    Author
    Fleischman, Steven J.
    Chair
    Klein, David R.
    Committee
    Thompson, Steven K.
    Viereck, Leslie A.
    White, Robert G.
    Regelin, Wayne L.
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/4758
    Abstract
    Terrestrial lichen abundance, lichen availability as affected by snow, and winter fecal composition were investigated for the Delta Caribou Herd (DCH), which recently quadrupled in size and expanded its early winter range. Mean lichen abundance was relatively low (10-85 g/m2). However, even on heavily-used range, caribou ate only 7% of lichen standing crop annually. Snow affected lichen availability only slightly on peripheral tundra ranges, since lichens predominated on xeric sites with little snow. On traditional ranges, lichens were shorter and rarely found in high-density patches; disproportionate grazing and trampling of exposed lichens had caused reduced lichen availability. This was reflected in lower fecal lichen for caribou on traditional ranges, however DCH population growth or seasonal movements probably were not substantially affected. A model of caribou cratering energetics indicated that loss of potential foraging time may influence energy balance more than does cratering energy expenditure.
    Table of Contents
    Abstract -- Table of Contents -- List of Figures -- List of Tables -- Acknowledgements -- Introduction -- Study Herd/Area -- Methods -- Results -- Discussion -- Conclusions -- Recommendations -- Literature Cited -- Appendix A: A Model of the Energy Required by Caribou to Dig a Feeding Crater -- Appendix B: Lichen Abundance by Study Area and Vegetation Type -- Appendix C: Snow Stake Readings
    Date
    1990-05
    Type
    Thesis
    Collections
    Biological Sciences
    Theses supervised by AKCFWRU

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