Scientists from the California Academy of Sciences have identified 20 new species and recorded evidence of warming trends in deep coral reefs following the retrieval of long-term monitoring devices from waters off Guam. The findings are the result of two-week expedition in November 2025 to recover 13 autonomous reef monitoring structures (ARMS), which had been passively collecting biodiversity and temperature data at depths of up to 100 metres (330ft) since their deployment in 2018.
The project was carried out in collaboration with the Smithsonian Institution’s Global ARMS Program. Scientists from the University of Guam, the University of São Paulo and the Bishop Museum also took part.
Original Article: Twenty new deep-reef species discovered in ‘twilight zone’ off Guam
