, Volume 4, Issue 2, pp 153-162

Mate acquisition by a solitary crabZebrida adamsii , a symbiont of the sea urchin

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A small crabZebrida adamsii, an obligate symbiont of the sea urchin, lives solitary on a host from the earliest stage of its benthic life. In the breeding season males frequently move between hosts to search for mates. Analysis of daily positional changes of individually marked crabs indicates that males often land on the substrate to migrate between separate hosts. Females also change hosts before they copulate, but after oviposition they stay on the same hosts for a long time, similarly to crabs in the nonbreeding season.