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    Epifaunal community structure associated with Riftia pachyptila aggregations in chemically different hydrothermal vent habitats

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    m305p067.pdf (109.0Kb)
    Date
    2005-12-23
    Author
    Govenar, Breea  Concept link
    Le Bris, Nadine  Concept link
    Gollner, Sabine  Concept link
    Glanville, Joanne  Concept link
    Aperghis, Adrienne B.  Concept link
    Hourdez, Stephane  Concept link
    Fisher, Charles R.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4484
    As published
    https://doi.org/10.3354/meps305067
    DOI
    10.3354/meps305067
    Keyword
     Hydrothermal vent; East Pacific Rise; Riftia pachyptila; Community structure; Epifauna; Benthos 
    Abstract
    The vestimentiferan tubeworm Riftia pachyptila (Polychaeta: Sibloglinidae) often dominates early succession stages and high productivity habitats at low-temperature hydrothermal vents on the East Pacific Rise. We collected 8 aggregations of R. pachyptila and the associated epifaunal community at 2 discrete sites of diffuse hydrothermal activity, in December 2001 and December 2002. Because of the high spatial and temporal variability of the biotic and abiotic factors related to hydrothermal vent activity, significant differences in the structure and the composition of the community were expected to occur at the scale of either 1 yr or 500 m distance between very different sites. There was no significant difference in the temperature ranges of the diffuse flow between sites or years, even though the environmental conditions were very different at the 2 sites. At 1 site (Riftia Field), the diffuse hydrothermal fluids had relatively low concentrations of sulfide, low pH, and high concentrations of iron. At the other site (Tica), the diffuse hydrothermal fluids had higher sulfide concentrations, the pH was closer to neutral, and iron was undetectable. The physiological condition of R. pachyptila appeared to reflect the availability of sulfide at each site. However, the structure and the composition of the epifaunal community were remarkably similar between sites and years, with the exception of a few species. Aggregations of R. pachyptila support high local species diversity relative to the surrounding seafloor and high community similarity in different hydrothermal vent habitats.
    Description
    Author Posting. © Inter-Research, 2005. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Marine Ecology Progress Series 305 (2005): 67-77, doi:10.3354/meps305067.
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    Suggested Citation
    Marine Ecology Progress Series 305 (2005): 67-77
     

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