A unique subtidal vermetid reef formation in a nuclear power plant discharge area at Ilha Grande Bay (southwestern Atlantic Ocean)

Researchers have documented a unique subtidal vermetid reef formation dominated by Petaloconchus varians, extending over approximately 1,000 m² within the nuclear power plant discharge area of Ilha Grande Bay in Brazil. This monospecific reef, characterized by dense clusters resembling 'microatolls,' represents an unprecedented finding on the Brazilian coast, thriving under extreme conditions including high temperatures (>36°C), chlorine inputs, and strong waterflow currents (30 cm/s). The study describes the formation, density, and range extension of these reefs, highlighting their adaptation to anthropogenic stressors in a UNESCO World Heritage Site. The findings challenge assumptions about vermetid reef resilience and distribution, offering insights into the ecological impacts of nuclear discharge areas.

Breves, A., Moraes, F. C., Pimenta, A. D., & Junqueira, A. O. R. (2016). A unique subtidal vermetid reef formation in a nuclear power plant discharge area at Ilha Grande Bay (southwestern Atlantic Ocean). Marine Biodiversity Records, 9(1). https://doi.org/10.1186/s41200-016-0070-1