functioning of benthic assemblages at the shelf edge by the 

 introduction of methane and H^S-based chemosynthetic food webs. 



ACKNOWLEDGMENTS 



We thank the captain and crew of the R/V Aloha , the R/V 

 McGaw and the diving personnel of the DSV Mermaid-II and DSV 

 Delta for their helpful support during these studies. We acknow- 

 ledge the helpful discussions and invaluable field support of 

 L.D. Kulm and E. Suess of the geological group. We thank NOAA's 

 Undersea Research Office (Contract No. 50-DGNR-7-00155 ) for our 

 first chance to observe and study in situ the rugged, rocky 

 shelf edge environments off Oregon, and we thank the Oregon State 

 University Sea Grant College Program for research support. 



LITERATURE CITED 



Barnes, R. D. 1980. Invertebrate Zoology . Philadelphia, PA, 

 Saunders College. 1089 pp. 



Boulegue, J., E. L. Benedetti, D. Dron, A. Mariotti, and R. 



Letolle. 1987. Geochemical and biogeochemical observations 

 on the biological communities associated with fluid venting 

 in Nanakai Trough and Japan Trench subduction zones. Earth 

 and Planet. Sci. Lett. , Vol. 83, pp. 343-355. 



Carey, A. G., Jr. 1972. Food sources of sublittoral, bathyal 

 and abyssal asteroids in the Northeast Pacific Ocean. 

 Ophelia , Vol. 10, pp. 35-47. 



Cavanaugh, C. M. 1985. Symbiosis of chemoautotrophic bacteria 

 and marine invertebrates from hydrothermal vents and 

 reducing sediments. In: M. L. Jones (ed.) Hydrothermal 

 Vents of the Eastern Pacfic: An Overview , Biol. Soc. of 

 Washington Bull. 6, pp. 373-388. 



Hyman, L. H. 1955. The Invertebrates : Echinodermata . New 

 York, N. Y., McGraw-Hill. 763 pp. 



Kulm, L. D., E. Suess, J. C. Moore, B. Carson, B. T. Lewis, 



S. D. Ritger, D. C. Kadko, T. M. Thornburg, R. W. Embley, W. 

 D. Rugh, M. G. Langseth, G. R. Cochrane, and R. L. Scammen. 

 1986. Oregon subduction zone: Venting, fauna and carbo- 

 nates. Science, Vol. 231, pp. 561-566. 



146 



