Effect of cheliped loss due to autotomy on shell selection behavior in the hermit crab Pagurus middendorffii

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  • Matsuo Kento
    Laboratory of Marine Biology, Graduate School of Fisheries Sciences, Hokkaido University
  • Yasuda Chiaki I.
    Laboratory of Marine Biology, Graduate School of Fisheries Sciences, Hokkaido University
  • Wada Satoshi
    Laboratory of Marine Biology, Graduate School of Fisheries Sciences, Hokkaido University

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Major cheliped is used in shell selection in the hermit crab Pagurus middendorffii. This study examined how loss of the major cheliped due to autotomy affected shell selection behavior and whether shell-size preference was affected. Crabs after autotomy changed shells less frequently than intact crabs. However, there was not a significant difference in shellsize preference between autotomized crabs and intact crabs. Since autotomy occurs during fleeing from a predatory attack in the field, subsequent reduction of frequency of changing shells might suppress the risk of predation for crabs.

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