Abstract
Dittoral and sublittoral hermit crabs (Coenobita clypeatus, Clibanarius tricolor, Calcinus dibicen, Petrochirus diogenes, Paguristes grayi, Pagurus miamensis, Paguristes tortugae, Paguristes cadenati and Pagurus sp.) were studied on Lighthouse Atoll, Belize. The Clibanarius tricolor population differed markedly in mean clutch size from congeneric populations at temperate latitudes and from conspecific populations in the Florida Keys. These differences can be attributed primarily to variation in shell utilization pattern, overlap with competitors, and breeding season. Regression analyses indicate that shell weight but not internal shell volume affects the clutch size of C. tricolor in Belize, probably due to selection for optimum volume resulting in the use of broken and encrusted shells with high weight: volume ratios. Both egg size and clutch size differed significantly among egg developmental stages in C. tricolor, Calcinus tibicen, and Pagurus miamensis.
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