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Influence of motivation on behaviour in the hermit crab, Pagurus samuelis

Published online by Cambridge University Press:  19 September 2008

Wendy L. Billock*
Affiliation:
Department of Earth and Biological Sciences, Loma Linda University, Loma Linda, CA 92350, USA
Stephen G. Dunbar
Affiliation:
Department of Earth and Biological Sciences, Loma Linda University, Loma Linda, CA 92350, USA
*
Correspondence should be addressed to: Wendy L. Billock, Department of Earth and Biological Sciences, Loma Linda University, Loma Linda, CA 92350, USA email: [email protected]

Abstract

Both the need for shelter and the need for food can be motivations that alter animal behaviour. We tested the hypothesis that the hermit crab, Pagurus samuelis, deprived of food, shells, or both will respond differently from control hermit crabs when presented with food and shells concurrently. We measured the number of contacts made with both food and shells, and time elapsed until hermit crabs either began feeding or inserted into shells. We interpreted making few contacts and initiating behaviour quickly to be an indication of short decision time and high motivation; whereas, making many contacts and having long initiation time indicated a long decision time and low motivation to acquire resources. Control (C) hermit crabs made 72% more contacts with food and 53% more contacts with shells than shell-less (S) crabs. Control hermit crabs also made 34% more contacts with food and 35% more contacts with shells than starved and shell-less (StS) hermit crabs. This suggests that S hermit crabs were more motivated to acquire shells than C crabs. In addition, StS hermit crabs chose to insert into provided shells, while hermit crabs remaining in their shells chose to feed. Results indicate that being shell-less is a stronger motivation than being starved, such that finding shelter takes priority over finding food when both are needed. In rocky intertidal environments, resources such as food and shells are likely to be ephemeral. Hermit crabs that are motivated to make appropriate decisions to acquire specific resources may have a distinct advantage over those that are distracted by numerous objects in their environment.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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References

REFERENCES

Abrams, P.A. (1987) Resource partitioning and competition for shells between intertidal hermit crabs on the outer coast of Washington. Oecologia 72, 248258.CrossRefGoogle ScholarPubMed
Angel, J.E. (2000) Effects of shell fit on the biology of the hermit crab Pagurus longicarpus (Say). Journal of Experimental Marine Biology and Ecology 243, 169184.CrossRefGoogle Scholar
Briffa, M. and Elwood, R.W. (2001) Decision rules, energy metabolism and vigour of hermit-crab fights. Proceedings of the Royal Society of London B 268, 18411848.CrossRefGoogle ScholarPubMed
Briffa, M. and Elwood, R.W. (2002) Power of shell-rapping signals influences physiological costs and subsequent decisions during hermit crab fights. Proceedings of the Royal Society of London B 269, 23312336.CrossRefGoogle ScholarPubMed
Briffa, M. and Elwood, R.W. (2007) Monoamines and decision making during contests in the hermit crab Pagurus bernhardus. Animal Behaviour 73, 605612.CrossRefGoogle Scholar
Chiussi, R., Diaz, H., Rittschof, D. and Forward, R.B. Jr. (2001) Orientation of the hermit crab Clibanarius antillensis: effects of visual and chemical cues. Journal of Crustacean Biology 21, 593605.CrossRefGoogle Scholar
Elwood, R.W. (1995) Motivational change during resource assessment by hermit crabs. Journal of Experimental Marine Biology and Ecology 193, 4155.CrossRefGoogle Scholar
Elwood, R.W. and Neil, S.J. (1992) Assessments and decisions: a study of information gathering by hermit crabs. London: Chapman & Hall.Google Scholar
Elwood, R.W., Wood, K.E., Gallagher, M.B. and Dick, J.T.A. (1998) Probing motivational state during agonistic encounters in animals. Nature 393, 6668.CrossRefGoogle Scholar
Gherardi, F. (2006) Fighting behavior in hermit crabs: the combined effect of resource-holding potential and resource value in Pagurus longicarpus. Behavioral Ecology and Sociobiology 59, 500510.CrossRefGoogle Scholar
Gherardi, F. and Atema, J. (2005) Effects of chemical context on shell investigation behavior in hermit crabs. Journal of Experimental Marine Biology and Ecology 320, 17.CrossRefGoogle Scholar
Halpern, B.S. (2004) Habitat bottlenecks in stage-structured species: hermit crabs as a model system. Marine Ecology Progress Series 276, 197207.CrossRefGoogle Scholar
Hazlett, B.A. (1981) The behavioral ecology of hermit crabs. Annual Review of Ecology and Systematics 12, 122.CrossRefGoogle Scholar
Hazlett, B.A. (1996) Organisation of hermit crab behaviour: responses to multiple chemical inputs. Behaviour 133, 619642.CrossRefGoogle Scholar
Hazlett, B.A. (1997) The organisation of behaviour in hermit crabs: responses to variation in stimulus strength. Behaviour 134, 5970.CrossRefGoogle Scholar
Hazlett, B.A., Rittschof, D. and Bach, C.E. (1996) Interspecific shell transfer by mutual predation site attendance. Animal Behaviour 51, 589592.CrossRefGoogle Scholar
Katz, J.N. and Rittschof, D. (1993) Alarm/investigation responses of hermit-crabs as related to shell fit and crab size. Marine Behaviour and Physiology 22, 171182.CrossRefGoogle Scholar
Krebs, J.R. and Davies, N.B. (1993) An introduction to behavioural ecology. Oxford: Blackwell Publishing.Google Scholar
Reese, E.S. (1963) The behavioral mechanisms underlying shell selection by hermit crabs. Behaviour 21, 78126.CrossRefGoogle Scholar
Reese, E.S. (1969) Behavioral adaptations of intertidal hermit crabs. American Zoologist 9, 343355.CrossRefGoogle Scholar
Rittschof, D. (1982) Chemical attraction of hermit crabs and other attendants to simulated gastropod predation sites. Journal of Chemical Ecology 6, 103118.CrossRefGoogle Scholar
Rittschof, D. and Hazlett, B.A. (1997) Behavioural responses of hermit crabs to shell cues, predator haemolymph and body odour. Journal of the Marine Biological Association of the United Kingdom 77, 737751.CrossRefGoogle Scholar
Tinbergen, N. (1951) The study of instinct. London: Oxford University Press.Google Scholar
Vance, R.R. (1972) The role of shell adequacy in behavioral interactions involving hermit crabs. Ecology 53, 10751083.CrossRefGoogle Scholar
Yoshino, K., Ozawa, M. and Goshima, S. (2004) Effects of shell size fit on the efficacy of mate guarding behaviour in male hermit crabs. Journal of the Marine Biological Association of the United Kingdom 84, 12031208.CrossRefGoogle Scholar