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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
Article

Abstract

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.

Keywords

Experimental Plot Large Species Small Species Rapid Movement Gastropoda 
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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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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