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Abstract
Ecological studies of the mangrove swamps of the Pacific Coast of Costa Rica in relation to the biology of the mollusk Geloina inflata showed that their physicochemical and soil characteristics were not significantly different from those of other tropical mangroves. Rhizophora mangle was considered a pioneer species; its aerial roots and the mud around them constitute the habitat of a great variety of mollusks of several genera, and are necessary for the development of G. inflata. Water pollution may be the cause of the recent disappearance of G. inflata from some mangroves and its total absence from others in the study areas. The populations of G. inflata in the Pochote and Mata de Limón mangroves showed a tendency to an increase in the number of individuals during the months of May and June, but no significant differences were found in the mean biomass between the two populations.
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