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© 1997 International Society for Behavioral Ecology

research-article

The worm re-turns: hiding behavior of a tube-dwelling marine polychaete, Serpula vermicularis

Lawrence M. Dill and Alex H. G. Fraser

Behavioural Ecology Research Group, Department of Biological Sciences, Simon Fraser University Burnaby, BC V5A 1S6, Canada

ABSTRACT

The polychaete worm Serpula vermicularis (Serpulidae) filter feeds at the mouth of its calcareous tube, but retreats into the tube when startled by mechanical stimuli likely to be associated with predators. While in its tube, a worm is safe but cannot feed. Thus, hiding has a lost-opportunity cost. We show that this cost can be substantial, given that food in the natural habitat appears in pulses, and good feeding conditions may not last long or recur frequently. We expect that a worm's hiding time will be sensitive to the lost-opportunity cost, and we present data from a series of experiments that support this prediction. The worms seem able to track relatively short-term changes in food availability, and some evidence suggests that they assess food availability on a relative basis, comparing current feeding conditions to those recently experienced. Hiding and other types of cryptic behavior are common antipredator tactics, and animals may commonly adjust the durations of such behaviors to current benefits and costs (including lost opportunity), as they perceive them

Key words: antipredator behaviour, food availability, hiding time, lost-opportunity cost, polychaete, Serpula vermicularis, Serpulidae.


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