Sargassum and associated calcareous epibionts were collected at sea and on a Bermuda beach. The weight percent of calcium carbonate produced by epibionts averaged 9.4% for samples collected at sea and 5.3% for beached samples. This indicates that Sargassum epibionts are a major potential source of carbonate sediment. Beached Sargassum adds between 8,213 g/m 2 /yr and 3,431 g/m 2 /yr to the sampled beach and is a significant actual source of carbonate sediment.

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