Abstract
Numerieal abundance, biomass, and species diversity were determined for the benthic invertebrate communities of Golfo Dulce, an anoxic basin on the west coast of Costa Rica. Both abundance and biomass were less than that expected in a tropical environment. The polychaete Paraonis lyra dominated the community within the basin. It is suggested that a life history which includes pelagic larvae allows this species to domina te the benthic assemblage in regions of variable oxygen concentrations.
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