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Study site. The world's largest rhodolith bed. (a) The Abrolhos bank, an expanse covering ∼46 000 km2 of the eastern Brazilian continental shelf where the rhodolith bed covers an area of ∼21 000 km2. Rhodoliths were sampled from two different sites surrounding the recently described sinkhole-like structures (red dots). (b) Physiognomy of Abrolhos rhodolith beds. (c) Individual monospecific rhodoliths.
