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    A CHARACTERIZATION OF A HYDROTHERMAL VENT COMMUNITY FROM A DIFFUSE FLOW VERTICAL WALL OF "THE TOWER" SULFIDE EDIFICE AT THE JUAN DE FUCA RIDGE

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    Genre
    Thesis/Dissertation
    Date
    2011
    Author
    Grinar, Michele
    Advisor
    Cordes, Erik E.
    Committee member
    Sanders, Robert W.
    Department
    Biology
    Subject
    Biology
    Ecology
    Community Ecology
    Hydrothermal Vents
    Juan De Fuca Ridge
    Ridgeia Piscesae
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/1349
    
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    DOI
    http://dx.doi.org/10.34944/dspace/1331
    Abstract
    The Juan de Fuca Ridge, located 400 km off the coast of Washington State, is home to unstable and unpredictable hydrothermal vent sites where chemosynthetic communities flourish. In 2007 the manned submersible ALVIN retrieved a Ridgeia piscesae tubeworm community in its entirety from the side of the Tower sulfide edifice from the Endeavor segment of the Juan de Fuca Ridge (47 55.416720 N, 129 6.487020 W, at a depth of 2269 m) using the Bushmaster Jr. collection device. The collection was analyzed for community structure and the data collected were compared to that from several other hydrothermal vent communities. It was determined that substrate composition is a factor that heavily influences community structure. The data were then compared to the community succession model developed by Sarrazin et. al. in 1997 and 1999 (Sarrazin et. al. 1997, Sarrazin and Juniper 1999). The Tower community was found to expand the model as a new community succession classification; that of community iii low flow. The Tower community was then analyzed for diversity, structure and tubeworm morphology in conjunction with two other communities from differing substrata. The Ridgeia piscesae tubeworms were found to be of the "long skinny" morphotype, one that was previously thought to only reside on basaltic substrate. The Tower community has similar species richness and higher species evenness than those from basaltic substrate, but similar richness and lower evenness that those from sulfide. This community type combines the characteristics of those from both substrata, resulting in a community with diversity and structure that is an intermediary between sulfide and basaltic substrates.
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