Response of hydrothermal vent vestimentiferan <Emphasis Type="Italic">Riftia pachyptila</Emphasis> to differences in habitat chemistry |
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Authors: | Kathleen M Scott Amanda J Boller Kimberly P Dobrinski Nadine Le Bris |
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Institution: | 1.Department of Integrative Biology,University of South Florida,Tampa,USA;2.Université Pierre et Marie Curie,Paris 6,France;3.Benthic EcoGeochemistry Laboratory, LECOB CNRS—UPMC, FRE 3350,Banyuls Marine Station Oceanological Observatory,Banyuls Sur Mer,France |
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Abstract: | Vestimentiferan tubeworms, which rely on intracellular sulfide-oxidizing autotrophic bacteria for organic carbon, flourish
at deep-sea hydrothermal vents despite the erratic nature of their habitat. To assess the degree to which differences in habitat
chemistry (sulfide, pH/CO2) might impact host and symbiont metabolic activity, Riftia pachyptila tubeworms were collected from habitats with low (H2S < 0.0001 mM) and high (up to 0.7 mM) sulfide concentrations. The elemental sulfur content of the symbiont-containing trophosome
organ was lower in specimens collected from the low-sulfide site. Symbiont abundance, RubisCO activity, and trophosome carbon
fixation rates were not significantly different for individuals collected from low- versus high-sulfide habitats. Carbonic
anhydrase activities were higher in the anterior gas exchange organs of R. pachyptila from the low-sulfide habitat. Despite large differences in habitat chemistry, symbiont abundance and autotrophic potential
were consistent, while the host appears to tailor carbonic anhydrase activity to environmental CO2 availability. |
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