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Science 17 July 1981:
Vol. 213. no. 4505, pp. 338 - 340
DOI: 10.1126/science.213.4505.338
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Articles

Hydrothermal Vent Clam and Tube Worm 13C/12C: Further Evidence of Nonphotosynthetic Food Sources

GREG H. RAU 1

1 Institute of Geophysics and Planetary Physics, University of California, Los Angeles 90024

The stable carbon isotope ratios in clam mantle tissues taken from both Galápagos and 21°N hydrothermal vent sites were similar to the unusually low ratios of carbon-13 to carbon-12 previously reported for a Galápagos hydrothermal vent mussel. In marked contrast to these bivalves, vestimentiferan worm tissues from a Galápagos vent had isotope ratios that were higher than those of open ocean biota. These observations suggest that more than one nonpelagic and nonphotosynthetic carbon fixation pathway is of nutritional importance to vent animals, and that at least one of these pathways is common to two geographically separated vent sites.

Submitted on June 10, 1980
Revised on December 8, 1980


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Blood Function in the Hydrothermal Vent Vestimentiferan Tube Worm.
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