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Effect of depth and vent fluid composition on the carbon sources at two neighboring deep-sea hydrothermal vent fields (Mid-Cayman Rise)

Publication ,  Journal Article
Bennett, SA; Dover, CV; Breier, JA; Coleman, M
Published in: Deep-Sea Research Part I: Oceanographic Research Papers
October 1, 2015

In this study, we have used stable isotopes of megafauna, microbial mats and particulate organic matter to examine the effect of depth and vent fluid composition on the carbon sources at two proximal, chemically distinct hydrothermal vent fields along the Mid-Cayman Rise. The basalt hosted Piccard vent field (4980. m) is twice as deep as the ultramafic hosted Von Damm vent field (2300. m) and has very different faunal assemblages. Of particular note is the presence of seep-associated fauna, Escarpia and Lamellibrachia tubeworms, at the Von Damm vent field.We identify a greater range of carbon sources and a suggestion of increased photosynthetic inputs to the Von Damm vent field compared to Piccard vent field. Rimicaris hybisae shrimp are the only abundant species shared between the two vent fields with δ13C values ranging between -22.7 and -10.1‰. Higher concentrations of hydrogen sulfide in the vent fluids at Piccard is proposed to be responsible for varying the relative contributions of the carbon fixation cycles used by their epibionts. Seep-associated fauna at Von Damm rely on elevated, thermogenic hydrocarbon content of the vent fluids for their carbon source (δ13C values ranging from -21.3 to 11.6‰). They also derive energy from hydrogen sulfide formed by the microbial reduction of sulfide (δ34S values ranging from -10.2 to -6.9‰). The tubeworms have very short roots (buried at most a centimeter into rubble), suggesting that microbial sulfate reduction must be occurring either in the shallow subsurface and/or in the anterior part of the tube. Overall, megafauna at Von Damm vent field appear to have a smaller food chain length (smaller δ15N range) but a greater breadth of trophic resources compared to the megafauna at the Piccard vent field.

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Published In

Deep-Sea Research Part I: Oceanographic Research Papers

DOI

ISSN

0967-0637

Publication Date

October 1, 2015

Volume

104

Start / End Page

122 / 133

Related Subject Headings

  • Oceanography
  • 0405 Oceanography
  • 0403 Geology
  • 0402 Geochemistry
 

Citation

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Chicago
ICMJE
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Bennett, S. A., Dover, C. V., Breier, J. A., & Coleman, M. (2015). Effect of depth and vent fluid composition on the carbon sources at two neighboring deep-sea hydrothermal vent fields (Mid-Cayman Rise). Deep-Sea Research Part I: Oceanographic Research Papers, 104, 122–133. https://doi.org/10.1016/j.dsr.2015.06.005
Bennett, S. A., C. V. Dover, J. A. Breier, and M. Coleman. “Effect of depth and vent fluid composition on the carbon sources at two neighboring deep-sea hydrothermal vent fields (Mid-Cayman Rise).” Deep-Sea Research Part I: Oceanographic Research Papers 104 (October 1, 2015): 122–33. https://doi.org/10.1016/j.dsr.2015.06.005.
Bennett SA, Dover CV, Breier JA, Coleman M. Effect of depth and vent fluid composition on the carbon sources at two neighboring deep-sea hydrothermal vent fields (Mid-Cayman Rise). Deep-Sea Research Part I: Oceanographic Research Papers. 2015 Oct 1;104:122–33.
Bennett, S. A., et al. “Effect of depth and vent fluid composition on the carbon sources at two neighboring deep-sea hydrothermal vent fields (Mid-Cayman Rise).” Deep-Sea Research Part I: Oceanographic Research Papers, vol. 104, Oct. 2015, pp. 122–33. Scopus, doi:10.1016/j.dsr.2015.06.005.
Bennett SA, Dover CV, Breier JA, Coleman M. Effect of depth and vent fluid composition on the carbon sources at two neighboring deep-sea hydrothermal vent fields (Mid-Cayman Rise). Deep-Sea Research Part I: Oceanographic Research Papers. 2015 Oct 1;104:122–133.
Journal cover image

Published In

Deep-Sea Research Part I: Oceanographic Research Papers

DOI

ISSN

0967-0637

Publication Date

October 1, 2015

Volume

104

Start / End Page

122 / 133

Related Subject Headings

  • Oceanography
  • 0405 Oceanography
  • 0403 Geology
  • 0402 Geochemistry