Marine Biology

, Volume 100, Issue 1, pp 63–68 | Cite as

Movements of intertidal whelks (Morula marginalba and Thais orbita) in relation to availability of prey and shelter

  • P. G. Fairweather


The movements of two species of predatory whelks (Muricidae: Gastropoda) were examined on several rocky seashores in New South Wales, Australia, from 1980 to 1984. The smaller species, Morula marginalba Blainville, moved less far than the larger species, Thais orbita (Gmelin). Intermittent but rapid movement allowed T. orbita to shelter in exposed places low on the shore, but to feed on their preferred prey, barnacles, much higher up to shore. This resulted in a dynamic and unpredictable pattern of vertical foraging movements for this species. Compared to areas with intact prey or with barnacles that had been killed but not removed, M. marginalba moved quickly away from areas from which barnacles had been experimentally removed. Many M. marginalba left experimental plots on two shores without prey or crevices in which to shelter, whereas some stayed over 30 d in areas with either prey or crevices (but not both), and most remained in plots where both prey and crevices were available. Thus, the presence of suitable prey and crevices seems to influence the movements of both species, which respond in different ways, corresponding to their different mobilities. These results are discussed in relation to the behavioural cues involved and predation by the whelks.


Experimental Plot Large Species Small Species Rapid Movement Gastropoda 
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Literature cited

  1. Andrew, N. L., Stocker, L. J. (1986). Dispersion and phagokinesis in the echinoid Evechinus chloroticus (Val.). J. exp. mar. Biol. Ecol. 100: 11–23Google Scholar
  2. Black, R. (1978). Tactics of whelks preying on limpets. Mar. Biol. 46: 157–162Google Scholar
  3. Butler, A. J. (1979). Relationships between height on the shore and size distribution of Thais spp. (Gastropoda: Muricidae). J. exp. mar. Biol. Ecol. 41: 163–194Google Scholar
  4. Connell, J. H. (1961). The effect of competition, predation by Thais lapillus and other factors on natural populations of the barnacle Balanus balanoides. Ecol. Monogr. 31: 61–104Google Scholar
  5. Connell, J. H. (1970). A predator-prey system in the marine intertidal region. I. Balanus glandula and several predatory species of Thais. Ecol. Monogr. 40: 49–78Google Scholar
  6. Connell, J. H. (1974). Field experiments in marine ecology. In: Marsiscal, R. (ed.) Experimental marine biology. New York, Academic Press, p. 1–54.Google Scholar
  7. Denley, E. J. (1981). The ecology of the intertidal barnacle Tesseropora rosea. Unpublished Ph. D. thesis, University of SydneyGoogle Scholar
  8. Denley, E. J., Underwood, A. J. (1979). Experiments on factors influencing settlement, survival and growth of two species of barnacles in NSW. J. exp. mar. Biol. Ecol. 36: 269–293Google Scholar
  9. Fairweather, P. G. (1988a). Predation creates haloes of bare space among prey on rocky seashores in New South Wales. Aust. J. Ecol. 13: (In press)Google Scholar
  10. Fairweather, P. G. (1988b). Correlations of predatory whelks with intertidal prey at several scales of time and space.Mar. Ecol. Prog. Ser. 45: 237–245Google Scholar
  11. Fairweather, P. G., Underwood, A. J., Moran, M. J. (1984). Preliminary investigations of predation by the whelk Morula marginalba. Mar. Ecol. Prog. Ser. 17: 143–156Google Scholar
  12. Feare, C. J. (1970). Aspects of the ecology of an exposed shore population of dogwhelks Nucella lapillus (L.).Oecologia 5: 1–18Google Scholar
  13. Garrity, S.D., Levings, S. C. (1981). A predator-prey interaction between two physically and biologically constrained tropical gastropods: direct, indirect and community effects. Ecol. Monogr. 51: 267–286Google Scholar
  14. Grahame J., Mill, P. J. (1986). Relative size of the foot of two species of Littorina on a rocky shore in Wales. J. Zool. Lond. (Ser. A) 208: 229–236Google Scholar
  15. Jernakoff, P., Fairweather, P. G. (1985). An experimental analysis of interactions among several intertidal organisms. J. exp. mar. Biol. Ecol. 94: 71–23Google Scholar
  16. Kitching, J. A., Ebling, F. J. (1967). Ecological studies at Lough Ine. Adv. ecol. Res. 4: 197–291Google Scholar
  17. Laur, D. R., Ebeling, A. W., Reed, D. C. (1986). Experimental evaluations of substrate types as barriers to sea urchin (Strongylocentrotus spp.) movement. Mar. Biol. 93: 209–215Google Scholar
  18. Menge, B. A. (1978). Predation intensity in a rocky interdital community: effect of an algal canopy, wave action and desiccation on predator feeding rates. Oecologia 34: 17–34Google Scholar
  19. Menge, J. L. (1974). Prey selection and foraging period of the predaceous rocky intertidal snail Acanthina punctulata. Oecologia 17: 293–316Google Scholar
  20. Miller, S. L. (1974). Adaptive design of locomotion and foot form in prosobranch gastropods. J. exp. mar. Biol. Ecol. 14: 99–156Google Scholar
  21. Moore, H. B. (1938). The biology of Purpura lapillus. III. Life history and relation to environmental factors. J. mar. biol. Ass. U.K. 23: 67–74Google Scholar
  22. Moran, M. J. (1985a). The timing and significance of sheltering and foraging behaviour of the predatory intertidal gastropod Morula marginalba (Muricidae). J. exp. mar. Biol. Ecol. 93: 103–114Google Scholar
  23. Moran, M. J. (1985b). Distribution and dispersion of the predatory intertidal gastropod Morula marginalba Blainville. Mar. Ecol. Prog. Ser. 22: 41–52Google Scholar
  24. Morgan, P. R. (1972). The influence of prey availability on the distribution and predatory behaviour of Nucella lapillus (L.). J. Anim. Ecol. 41: 257–272Google Scholar
  25. Phillips, B. F. (1969). Population ecology of the whelk Dicathais aegrota. Aust. J. mar. Freshwat. Res. 20: 225–265Google Scholar
  26. Pratt, D. M. (1974). Intraspecific signalling of hunting success or failure in Urosalpinx cinerea. J. exp. mar. Biol. Ecol. 21: 7–9Google Scholar
  27. Underwood, A. J. (1981). Structure of a rocky intertidal community in NSW: patterns of vertical distribution and seasonal change. J. exp. mar. Biol. Ecol. 51: 57–85Google Scholar
  28. Underwood, A. J. (1985). Physical factors and biological interactions: the necessity and nature of ecological experiments. In: Moore, P. G., Seed, R. (eds.) The ecology of rocky coasts. Hodder & Stoughton, London, p. 372–390Google Scholar
  29. Underwood, A. J., Fairweather, P. G. (1986). Intertidal communities: do they have different ecologies or different ecologists? Proc. ecol. Soc. Aust. 14: 7–16Google Scholar
  30. West, L. (1986). Interindividual varition in prey selection by the snail Nucella (=Thais) emarginata. Ecology 67: 798–809Google Scholar

Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • P. G. Fairweather
    • 1
  1. 1.Institute of Marine Ecology and School of Biological SciencesUniversity of SydneyAustralia

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