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Journal of Chemical Ecology

, Volume 31, Issue 12, pp 2877–2896 | Cite as

Unraveling the Nature of Individual Recognition by Odor in Hermit Crabs

  • Francesca GherardiEmail author
  • Elena Tricarico
  • Jelle Atema
Article

Abstract

Individual recognition is a key element in the social life of many invertebrates. However, most studies conducted so far document that several species are capable of a “binary” discrimination among conspecifics, but not of a “true individual recognition.” Our objective was to learn more about the mechanisms that underlie individual recognition by odor in hermit crabs by individuating some of its properties. Using Pagurus longicarpus Say 1817 as a model species, we conducted four series of experiments in which the response of every test crab (the “receiver”) to the different odor treatments (emitted by a “sender”) was evaluated from its investigative behavior toward an empty, high-quality shell. After having excluded the possibility that crabs chemically recognize familiar/unfamiliar shells and/or shells of high/low quality, we explored whether the receivers discriminate odors from two familiar senders and whether this discrimination also occurs with unfamiliar crabs. We also asked whether crabs form an association between the odor of a familiar sender and some of its relevant attributes, i.e., rank, size, and shell quality. Finally, the shells inhabited by familiar individuals were manipulated to modify the association between odor and shell quality. Results showed that: (1) there is no odor specific of a rank; (2) individual crabs discriminate their own odor from the odor of other individuals; (3) they can chemically discriminate between larger crabs inhabiting higher-quality shells and smaller crabs inhabiting lower-quality shells, provided that these crabs are familiar to them; (4) they associate the odor of an individual crab with the quality of the shell it inhabits; and (5) this association quickly changes when social partners switch to shells of different quality. These results indicate that the nature of chemical recognition in P. longicarpus is more refined than a simple binary system. The receiver appears able to associate a type of information from the sender with memories of past experiences, therefore suggesting the hermit crab's potential for relatively high-order knowledge about conspecifics.

Key Words

Individual recognition odors dominance hierarchies hermit crabs Pagurus longicarpus 

Notes

Acknowledgments

We thank three anonymous referees for constructive criticism to a previous version of the paper. The study was made possible by funds provided to F.G. by MBL Associates, Ann E. Kammer Memorial Fellowship Fund, H. Keffer Hartline Fellowship Fund, Frank R. Lillie Fund, and Plum Foundation.

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • Francesca Gherardi
    • 1
    Email author
  • Elena Tricarico
    • 1
  • Jelle Atema
    • 2
  1. 1.Dipartimento di Biologia Animale e GeneticaUniversità di FirenzeFlorenceItaly
  2. 2.Boston University Marine ProgramMarine Biological LaboratoryWoods HoleUSA

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