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13C/12C of organisms from Juan de Fuca Ridge hydrothermal vents: a guide to carbon and food sources

Published online by Cambridge University Press:  11 May 2009

A.J. Southward
Affiliation:
Marine Biological Association, The Laboratory, Citadel Hill, Plymouth, PL1 2PB. Department of Biology, University of Victoria, Victoria, British Columbia, V8W 2Y2.
E.C. Southward
Affiliation:
Marine Biological Association, The Laboratory, Citadel Hill, Plymouth, PL1 2PB. Department of Biology, University of Victoria, Victoria, British Columbia, V8W 2Y2.
B. Spiro
Affiliation:
NERC Isotope Geosciences Laboratories, Keyworth, Nottingham, NG12 5GG.
G.H. Rau
Affiliation:
Institute of Marine Sciences, University of California, Santa Cruz, CA 94035, USA
V. Tunnicliffe
Affiliation:
Department of Biology, University of Victoria, Victoria, British Columbia, V8W 2Y2.

Abstract

Soft tissue δ13C values were determined in vestimentiferan tube worms, alvinellid polychaetes and molluscs from Axial Seamount and Middle Valley, North-east Pacific. Inorganic carbon in mollusc shells and water samples was also analysed. In the vestimentiferan, Ridgeia piscesae, which lives in symbiosis with sulphur-oxidizing chemolithoautotrophic bacteria, tissue samples from the Axial vents showed δ13C values from −11 to −16‰, whereas at Middle Valley, where venting occurs through sediments, the δ13C ranged from −16 to −26‰. The tissues of an associated polychaete, Paralvinella palmiformis, which feeds on free-living bacteria, had δ13C values in the range −21 to −26‰. The bivalve Calyptogena from Middle Valley was more depleted than Ridgeia and Paralvinella, −37‰, closer to the ratios found in chemolithoautotrophic symbioses in non-vent habitats. Considerable, but variable, depletion (−23 to −42‰) was found in small gastropods. Mollusc shells and diluted vent water differed little in δ13C compared to inorganic carbon in ambient deep sea-water.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1994

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