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    Kelp forests and barren grounds: phlorotannin production and holdfast community structure in the Aleutian dragon kelp, Eualaria fistulosa

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    Author
    Schuster, Martin D.
    Chair
    Konar, Brenda
    Committee
    Iken, Katrin
    Coyle, Kenneth
    Keyword
    kelps
    Alaska
    Aleutian Islands
    kelp bed ecology
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/11324
    Abstract
    The canopy forming kelp Eualaria fistulosa inhabits two organizational states throughout the Aleutian archipelago, kelp forests and barren grounds. Urchin abundance and behavior determines which state dominates in any given area. Sporophyll phlorotannin content and holdfast epibiont fauna were investigated at multiple islands along the Aleutian archipelago to determine how the organizational state affects the production of secondary metabolites and the taxon richness, abundance and biomass of holdfast communities. Barren ground sporophylls had higher phlorotannin content than kelp forest sporophylls, although grazing rates on sporophylls from each state did not differ during in situ grazing experiments. The taxon richness, abundance and biomass of holdfast communities were similar between kelp forests and barren grounds at all islands, although these communities varied among islands and were mostly driven by holdfast volume. These results suggest that physical differences such as light and nutrient availability in the kelp forest structure between organizational states may be responsible for differences in phlorotannin content, but that these differences are not reflected in the holdfast community structure. It appears that barren ground holdfast communities are remnants of a once forested area.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2012
    Date
    2012-12
    Type
    Thesis
    Collections
    Marine Biology

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