As an exploratory investigation preparatory to work on littoral productivity in southern Florida, the dominant species of invertebrate macrofauna were sampled from a shore during very low tides in the summer of 1965. Each species is discussed briefly in terms of its abundance, biomass,
dispersion, and associations with tidal level, sediment texture, and marine grass. The total animal biomass, expressed as dry weight, had an estimated density on the order of 30 g/m2, of which 96 per cent was contributed by molluscs.
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