Abstract
1. Estimates of the size of a population of sand fiddler crabs, Uca pugilator (Bosc), were made with the Lincoln Index and Jackson's positive and negative models in the mobile phase of the activity cycle, and by stratified sampling of the immobile phase.2. Restricted random sampling was employed because of extremely contagious distribution of the crabs during the mobile phase and of desire to achieve better coverage of the burrowing area than unrestricted random sampling might have yielded during the immobile phase.3. During the mobile phase, the overall population was divided into four mobs, one separated from the rest by a physical, and the others from each other by a behavioral barrier. Only three out of 8967 marked individuals were recaptured outside their home territories. Some evidence suggesting that the mobs are derived from subpopulations occupying circumscribable burrowing areas was obtained.4. Appropriateness of the Lincoln Index was supported by immediate random dispersal of marked crabs a...
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