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Free Content Hermit Crab Shell Exchange as a Model System

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The exchange of shells between individual hermit crabs usually results in an increase in the shell fit of both crabs. It appears that information about the internal volume of the other crab's shell is utilized by the non-initiating crab in determining whether to exchange or not. Experiments with the diogenid Calcinus tibicen showed that the negotiation model of resource exchange predicts the outcome of shell exchanges in that species when volume is the measure of shell size utilized. Rearing crabs in environments which either increased or decreased the frequency of shell exchange experience indicated that crabs learn to utilize the information about an opponent's shell. That is, crabs without shell exchange experience do not behave according to the predictions of the negotiations model of exchange. It is hypothesized that the population level effects of interactions between crab species which utilize shells in common will vary from competitive to mutualistic. The category of ecological process involved will depend upon the capture efficiency of the crabs. This in turn will be related to the relative size of the snail populations. The fact that crabs learn to negotiate can speed up the dynamic interactions between crab species.
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Document Type: Research Article

Publication date: 01 September 1987

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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