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Coral reefs have highly biodiverse ecosystem in the ocean. Many symbiotic species habituate there. We measured soundscape diversity, which could be an index of the biodiversity of soniferous symbiotics. Due to the global warming, bleaching of corals happened world-widely in recent years. Symbiotics leave from bleached coral reefs as well. However, they could survive in deep water corals that was called deep reef refugia hypothesis. Soundcape diversities at shallow and deep coral reefs monitored by fixed autonomous recorders were compared. Simultaneously, spatial mappings of damsel fish and crustaceans, which are commonly observed in coral reefs were conducted using towed hydrophone. The phonating damsel fish showed patchy distribution in shallow waters, whereas crustaceans concentrated in a large coral reef area. Unsupervised machine learning algorithm was applied to categorized power spectrum shapes every 5 minutes and classify 6 soundscapes. Number of each soundscape was counted automatically and the Shannon index was calculated in deep and shallow waters. Calculated soundscape diversity in the deep water was larger than that in the shallow water that is consistent with refugia hypothesis. Underwater soundscape could be used to monitor biodiversity and distribution of aquatic animals, which is hardly observed visually.
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