Variation in the hydrothermal vent clam, Calyptogen magnifica, at the Rose Garden vent on the Galapagos spreading center

C. R. Fisher, J. J. Childress, A. J. Arp, J. M. Brooks, D. L. Distel, J. A. Dugan, H. Felbeck, L. W. Fritz, R. R. Hessler, K. S. Johnson, M. C. Kennicutt, R. A. Lutz, S. A. Macko, A. Newton, M. A. Powell, G. N. Somero, T. Soto

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


Calyptogena magnifica occupy a relatively restricted habitat at the Rose Garden hydrothermal vent site on the Galapagos Rift. These clams are found in areas with very low flow of vent water and gain exposure to hydrogen sulfide by inserting their well-vascularized foot into cracks that contain this flow. Vent water is undetectable around the siphons of many of the individuals, and they therefore probably take up sulfide through their foot, and oxygen and inorganic carbon through their gills. Age estimates indicate that the bulk of the recruitment of C. magnifica occured between 1971 and 1976. Isotopic evidence indicates that symbionts are the main source of both nutritional carbon and nitrogen for the clams, and that the symbionts assimilate both of these substrates from inorganic sources. Carbohydrate and protein in the clam soft tissues, as well as the elemental sulfur content of their gills, decrease with increasing clam size. There is only slight variation in most of the parameters measured, and none of the parameters show nearly the variation seen in the other hydrothermal vent bivalve, Bathymodiolus thermophilus. However, several parameters, such as δ13C, condition index, and some bacterial enzyme activities, vary significantly with habitat.

Original languageEnglish (US)
Pages (from-to)1811-1831
Number of pages21
JournalDeep Sea Research Part A, Oceanographic Research Papers
Issue number10-11
StatePublished - 1988

All Science Journal Classification (ASJC) codes

  • General Environmental Science
  • General Earth and Planetary Sciences


Dive into the research topics of 'Variation in the hydrothermal vent clam, Calyptogen magnifica, at the Rose Garden vent on the Galapagos spreading center'. Together they form a unique fingerprint.

Cite this