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Gorda Ridge pp 225-240 | Cite as

Distributional Ecology of Benthic Megaepifauna and Fishes in Gorda Ridge Axial Valley

  • Andrew G. CareyJr.
  • Gary L. Taghon
  • David L. Stein
  • Peter A. Rona
Conference paper

Abstract

Using bottom photographs and videotapes taken by various institutions in 1984 to 1986, we describe the taxonomic composition and patterns of distribution on two geographic scales and the relative abundance of the benthic epifauna and fishes in Gora Ridge axial valley. Gorda Ridge runs approximately northeast-southwest 200 to 300 km off northern California and southern Oregon and lies within the U.S. Exclusive Economic Zone. Suspension feeding invertebrate taxa occur in all rocky and sedimentary environments. Crinoids appear dominant at the northernmost stations, and ascidians are dominant in the central Gorda Ridge region. In the sedimented Escanaba Trough hexactinellid sponges and gorgonian soft corals are present. Suspension feeding epifauna tend to occur nonrandomly with even distributions predominant. Assemblages of invertebrates and fishes associated with rock and sediment differ in composition and abundance. Deposit feeding organisms become relatively more abundant and are interspersed with stalked suspension feeders at the southern stations of the sediment-filled southern Escanaba Trough. Many species associated with sediments are similar to those found on the surrounding abyssal plains. Biomass is unevenly distributed. The axial valley fauna is abundant and diverse, undoubtedly supported by organic materials of continental origin, including runoff from the Columbia River. In addition, scattered hydrothermal venting provides energy sources for adjacent chemosynthesis-based food webs. The enclosing valley walls and rough topography appear to constrain currents and cause turbulence that maintains the high concentrations of suspended particles observed near the valley floor.

Keywords

Valley Floor Abyssal Plain Suspended Particulate Material Axial Valley Particulate Organic Material 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Ambler JW (1980) Species of Munidopsis (Crustacea, Galatheidae) occurring off Oregon and in adjacent waters. Fishery Bull 78:13–34.Google Scholar
  2. Barnes CA, Duxbury AC, Morse B-A (1972) Circulation and selected properties of the Columbia River effluent at sea. In: Pruter AT, Alverson DL (eds) The Columbia River Estuary and Adjacent Ocean Waters. Seattle: University of Washington Press, p 41.Google Scholar
  3. Carey AG Jr, Kyte MA (1989) Distributional ecology of Ophiuroidea on the Oregon continental slope and adjacent abyssal plains. (In preparation.)Google Scholar
  4. Carey AG Jr, Stein DL, Taghon GL (1986) Analysis of epifauna and infaunal community structure at the Gorda Ridge. Oregon Department of Geology and Mineral Industries Open-File Report 0–86–11, 34 pp.Google Scholar
  5. Carey AG Jr, Stein DL, Taghon GL (1987) Analysis of epifaunal community structure on the Gorda Ridge. Oregon Department of Geology and Mineral Industries Open-File Report 0–87–05, 48 pp.Google Scholar
  6. Carney RS, Carey AG Jr (1976) Distribution of holothuroids on the northeastern Pacific (Oregon, U.S.A.) continental slope, shelf, and abyssal plain. Thallasia Yugoslavica 12:67–74.Google Scholar
  7. Carney RS, Carey AG Jr (1982) Distribution and diversity of holothuroids on Cascadia Basin and Tufts Abyssal Plain. Deep-Sea Res 29:597–607.CrossRefGoogle Scholar
  8. Cavanaugh, CM (1985) Symbioses of chemoautotrophic bacteria and marine invertebrates from hydrothermal vents and reducing sediments. Biol Soc Wash Bull 6:373–388.Google Scholar
  9. Chezar H, Lee J (1985) A new look at deep-sea video. Deep-Sea Res 32:1429–1436.CrossRefGoogle Scholar
  10. Clague DA, Riesen W, Quinterno P, et al. (1984) Preliminary geological, geophysical, and biological data from Gorda Ridge. U.S. Geological Survey Open-File Report 84–364.Google Scholar
  11. Conan G, Roux M, Sibuet M (1981) A photographic survey of a population of the stalked crinoid Diplocrinus (Annacrinus) wyville-thomsoni (Echinodermata) from the bathyal slope of the Bay of Biscay. Deep-Sea Res 28:441–453.CrossRefGoogle Scholar
  12. Conomos TG, Gross MG (1972) River-ocean suspended particulate matter relations in summer. In: Pruter AT, Alverson DL (eds) Columbia River Estuary and Adjacent Ocean Waters. Seattle: University of Washington Press, p 176.Google Scholar
  13. Genin A, Dayton PK, Lonsdale PF, Spiess FN (1986) Corals on seamount peaks provide evidence of current acceleration over deep-sea topography. Nature 322:59–61.CrossRefGoogle Scholar
  14. Grassle JF (1986) The ecology of deep-sea hydrothermal vent communities. Adv Marine Biol 23:301–362.CrossRefGoogle Scholar
  15. Haedrich R, Rowe G, Polloni P (1980) The megabenthic fauna in the deep-sea south of New England. J Marine Res 57:165–179.Google Scholar
  16. Hessler, RR, Smithey WM Jr (1983) The distribution and community structure of megafauna at the Galapagos Rift hydrothermal vents. In: Rona PA, Bostrom K, Laubier L, Smith KL (eds) Hydro-thermal Processes at Seafloor Spreading Centers, NATO Conference Series IV. New York: Plenum Press, pp 735–770.Google Scholar
  17. Jumars PA, Eckman JE (1983) Spatial structure within deep-sea benthic communities. In: Rowe GT (ed) The Sea, Vol 8. New York: Wiley Interscience, pp 399–451.Google Scholar
  18. Laubier L, Monniot C (eds) (1985) Peuplements Profonds de Golfe de Gasgogne. Brest, France Institute Français de Recherche pour l’Exploitation de la Mer.Google Scholar
  19. McCauley JE, Carey AG Jr (1967) Echinoidea of Oregon. J Fish Res Board Can 24:1385–1401.CrossRefGoogle Scholar
  20. Monniot C, Monniot F (1978) Recent work on the deep-sea tunicates. Oceanogr Marine Biol Annu Rev 16:181–228.Google Scholar
  21. Morton JL, Holmes ML, Koski RA (1987) Volcanism and massive sulfide formation at a sedimented spreading center, Escanaba Trough, Gorda Ridge, Northeast Pacific Ocean. Geophys Res Lett 14:769–772.CrossRefGoogle Scholar
  22. Pearcy WG, Stein DL, Carney RS (1982) The deep-sea benthic fish fauna on the northeastern Pacific Ocean of Cascadia and Tufts Abyssal Plains and adjoining continental slopes. Biol Oceanogr 1:375–428.Google Scholar
  23. Pielou EC (1977) Mathematical Ecology. New York: John Wiley and Sons.Google Scholar
  24. Rona PA, Denlinger R, Fisk M, et al. (1988) Hydrothermal activity on the Gorda Ridge. Eos 69:1588.CrossRefGoogle Scholar
  25. Sartori R (1980) Factors affecting the distribution of ahermatypic corals on the Mediterranean sea-floor: A probablistic study. Deep-Sea Res 27:655–663.CrossRefGoogle Scholar
  26. Taylor LR, Woiwod IP, Perry JN (1978) The density-dependence of spatial behaviour and the rarity of randomness. J Anim Ecol 47:383–408.CrossRefGoogle Scholar
  27. Tuttle JH (1985) The role of sulfur-oxidizing bacteria at deep-sea hydrothermal vents. Biol Soc Wash Bull 6:335–343.Google Scholar
  28. Vallier TL, Harold PJ, and Girdely WA (1973) Provenances and dispersal patterns of turbidite sand in Escanaba Trough, northeastern Pacific Ocean. Marine Geology, 15, 67–87.CrossRefGoogle Scholar
  29. Zierenberg RA, Koski RA, Shanks WC III, and SLACK JF (1988) Preliminary results of ALVIN dives on active sediment-hosted massive sulfide deposits in the Escanaba Trough, southern Gorda Ridge. Eos, 69, 1488.Google Scholar

Copyright information

© Springer-Verlag New York Inc. 1990

Authors and Affiliations

  • Andrew G. CareyJr.
  • Gary L. Taghon
  • David L. Stein
  • Peter A. Rona

There are no affiliations available

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