Marine Biology

, Volume 100, Issue 1, pp 117–126 | Cite as

Hydrodynamic study of the functional morphology of the benthic suspension feeder Phoronopsis viridis (Phoronida)

  • A. S. Johnson
Article
Accepted:

Abstract

Ambient water currents were altered by the morphology of an active suspension feeder, Phoronopsis viridis Hilton (phylum Phoronida), to produce a flow around its ciliated crown of feeding tentacles (lophophore). To test the effects of specific morphological characteristics on patterns of water movement, the morphology of model phoronids was varied and the resultant paths of water movement were compared to those around living phoronids. Living individuals were collected from the intertidal sandflats at Bodega Bay, California/USA, in the springs of 1984 and 1985. Although P. viridis actively produce a feeding current, use of various models demonstrated that the gross pattern of flow around a living phoronid was created by the physical interaction of its morphology with ambient currents. The important aspects of that morphology were the presence of a wide, porous crown of tentacles atop a cylindrically-shaped body. A hydrodynamic consequence of this morphology was that dye eroded off the substratum from a circular area around the base of the body and entrained upwards into the lophophore. In addition, rates of water movement were slowed at the lophophore and near the substratum adjacent to a phoronid, particles were slowed and diverted from horizontal paths immediately downstream of the lophophore, and the number of visible suspended particles within the wake per unit time increased with ambient velocity. Paths of water movement around a phoronid were also influenced by its angle and height relative to the substratum, indicating that P. viridis could behaviorally modify their local flow environment.

Keywords

Water Movement Local Flow Ambient Water Flow Environment Circular Area 
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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Literature cited

  1. Best, B. A. (1984). Feeding performance in passive suspension feeders: Ptilosarcus gurneyi (Coelenterata) as a model organism. Am. Zool. 24: p. 104AGoogle Scholar
  2. Carey, D. A. (1983). Particle resuspension in the benthic boundary layer induced by flow around polychaete tubes. Can. J. Fish. aquat. Sciences 40 (Suppl.): 301–308Google Scholar
  3. Chance, M. M., Craig, D. A. (1986). Hydrodynamics and behavior of Simuliidae larvae (Diptera). Can. J. Zool. 64: 1295–1309Google Scholar
  4. Colman, R. S., Crenshaw, H. C., Meyer, D. L., Strickler, J. R. (1984). A non-motorized dye ejector for visualization of flow in situ and its use with coral reef crinoids. Mar. Biol 83: 125–128Google Scholar
  5. Dauer, D. M. (1983). Functional morphology and feeding behavior of Scolelepis squamata (Polychaeta: Spionidae). Mar. Biol. 77: 279–285Google Scholar
  6. Eckman, J. E., Nowell, A. R. M. (1984). Boundary skin friction and sediment transport about an animal-tube mimic. Sedimentology 31: 851–862Google Scholar
  7. Eckman, J. E., Nowell, A. R. M., Jumars, P. A. (1981). Sediment destabilization by animal tubes. J. mar. Res. 39: 361–374Google Scholar
  8. Gilmour, T. H. J. (1978). Ciliation and function of the food-collecting and waste-rejecting organs of lophophorates. Can. J. Zool. 56: 2142–2155Google Scholar
  9. Johnson, A. S. (1986). Consequences of individual and group morphology: a hydrodynamic study of the benthic suspensionfeeder Phoronopsis viridis. Ph. D. thesis. University of California at Berkeley, CaliforniaGoogle Scholar
  10. Johnson, R. G. (1959). Spatial distribution of Phoronopsis viridis Hilton. Science, N. Y. 129: p. 1221Google Scholar
  11. Jørgensen, C. B. (1966). Biology of suspension feeding. Pergamon Press, OxfordGoogle Scholar
  12. Jørgensen, C. Berker (1981). A hydromechanical principle for particle retention in Mytilus edulis and other ciliary suspension feeders. Mar. Biol. 61: 277–282Google Scholar
  13. Jørgensen, C. B. (1983). Fluid mechanical aspects of suspension feeding. Mar. Ecol. Prog. Ser. 11: 89–103Google Scholar
  14. Koehl, M. A. R. (1977). Water flow and the morphology of zoanthid colonies. Proc. 3rd int. Symp. coral reef I. (Biology): 437–444 [Taylor, D. L. (ed.) School of Marine and Atmospheric Sciences, University of Miami]Google Scholar
  15. Koehl, M. A. R., Sebens, K. P. (1985). Can the food microhabitats of benthic suspension feeders be different from each other? Progm/Abstr. a. Mtg west. Soc. Naturalists 66: p. 47Google Scholar
  16. LaBarbera, M. (1978). Particle capture by a Pacific brittle star: experimental test of the aerosol suspension feeding model. Science, N. Y. 201: 1147–1149Google Scholar
  17. LaBarbera, M. (1981). Water flow patterns in and around three species of articulate brachiopods. J. exp. mar. Biol. Ecol. 55: 185–206Google Scholar
  18. Leversee, G. J. (1976). Flow and feeding in fan-shaped colonies of the gorgonian coral, Leptogorgia. Biol. Bull. mar. biol. Lab., Woods Hole 151: 344–356Google Scholar
  19. Merz, R. A. (1984). Self-generated versus environmentally produced feeding currents: a comparison for the sabellid polychaete Eudistylia vancouveri. Biol. Bull. mar. biol. Lab., Woods Hole 167: 200–209Google Scholar
  20. Meyer, D. L., LaHaye, C. A., Holland, N. D., Arneson, A. C., Strickler, J. R. (1984). Time-lapse cinematography of feather stars (Echinodermata: Crinoidea) on the Great Barrier Reef, Australia: demonstrations of posture changes, locomotion, spawning and possible predation by fish. Mar. Biol. 78: 179–184Google Scholar
  21. Nielsen, C., Rostgaard, J. (1976). Structure and function of an entoproct tentacle with a discussion of ciliary feeding types. Ophelia 15: 115–140Google Scholar
  22. Nowell, A. R. M., Jumars, P. A. (1984). Flow environments of aquatic benthos. A. Rev. Ecol. Syst. 15: 303–328Google Scholar
  23. Nowell, A. R. M., Jumars, P. A., Eckman, J. E. (1981). Effects of biological activity on the entrainment of marine sediments. Mar. Geol. 42: 133–153Google Scholar
  24. Okamura, B. (1984). The effects of ambient flow velocity, colony size, and upstream colonies on the feeding success of Bryozoa. I. Bugula stolonifera Ryland, an arborescent species. J. exp. mar. Biol. Ecol. 83: 179–193Google Scholar
  25. O'Neill, P. L. (1978): Hydrodynamic analysis of feeding in sand dollars. Oecologia 34: 157–174Google Scholar
  26. Patterson, M. R. (1980). Hydromechanical adaptation in Alcyonium siderium (Octocorallia). In: Schneck, D. J. (ed.) Biofluid mechanics, Vol. 2. Plenum Press, New York, p. 183–201Google Scholar
  27. Patterson, M. R. (1984). Patterns of whole colony prey capture in the octocoral, Alcyonium siderium. Biol. Bull. mar. biol. Lab., Woods Hole 167: 613–629Google Scholar
  28. Ronan, T. E. (1978). Food-resources and the influence of spatial pattern on feeding in the phoronid Phoronopsis viridis Biol. Bull. mar. biol. Lab., Woods Hole 154: 472–484Google Scholar
  29. Sokal, R. R., Rohlf, F. J. (1981). Biometry. The principles and practice of statistics in biological research. 2nd ed. W. H. Freeman & Co., New YorkGoogle Scholar
  30. Strathmann, R. (R.) (1973). Function of lateral cilia in suspension feeding of lophophorates (Brachiopoda, Phoronida, Ectoprocta). Mar. Biol. 23: 129–136Google Scholar
  31. Strathmann, (R. (R.) (1982). Cinefilms of particle capture by an induced local change of beat of lateral cilia of a bryozoan. J. exp. mar. Biol. Ecol. 62: 225–236Google Scholar
  32. Strathmann, R. R., Cameron, R. A., Strathmann, M. F. (1984). Spirobranchus giganteus (Pallas) breaks a rule for suspensionfeeders. J. exp. mar. Biol. Ecol. 79: 245–249Google Scholar
  33. Telford, M. (1981). A hydrodynamic interpretation of sand dollar morphology. Bull. mar. Sci. 31: 605–622Google Scholar
  34. Vogel, S. (1977). Current-induced flow through living sponges in nature. Proc. natn. Acad. Sci. U.S.A. 74: 2069–2071Google Scholar
  35. Vogel, S. (1981). Life in moving fluids. Willard Grant Press, BostonGoogle Scholar
  36. Vogel, S., LaBarbera, M. (1978). Simple flow tanks for research and teaching. BioSci. 28: 638–643Google Scholar
  37. Wainwright, S.A., Dillon, J. R. (1969). On the orientation of sea fans (genus Gorgonia). Biol. Bull. mar. biol. Lab., Woods Hole 136: 130–139Google Scholar
  38. Warner, G. F. (1977). On the shapes of passive suspension feeders. In: Keegan, B. F., Ceidigh, P. O., Boaden, P. J. S. (eds.) Biology of benthic organisms. Pergamon Press, Oxford, p. 567–576. [Proc. 11th Eur. mar. Biol. Symp.]Google Scholar
  39. Winston, J. E. (1979). Current-related morphology and behavior in some Pacific coast bryozoans. In: Larwood, G. P., Abbott, M. B. (eds.) Advances in bryozoology. Academic Press, London, p. 247–268Google Scholar

Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • A. S. Johnson
    • 1
  1. 1.Department of ZoologyUniversity of CaliforniaBerkeleyUSA

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