This Marine IBA is identified using seaward extensions around breeding colonies. It originates from the Japan Exclusive Economic Zone (EEZ) and falls within the Pacific, Northwest FAO ocean region. The site covers an area of 831 km2 and is 62 km away from the closet coastline. The depth ranges from 0 to 495 m, mean annual sea surface temperature falls between 20.48 and 21.3 °C and mean annual chlorophyll-a concentrations found to range between 0.39 and 0.55 mg/m3.
2 species trigger IBA criteria at this Marine IBA. Seaward extensions around breeding colonies; Kozushima island, Niijima and Shikinejima Islands include key near-colony areas for breeding populations of Japanese Murrelet (VU) and Tristram's Storm-petrel (NT).
BirdLife International (2022) Important Bird Areas factsheet: Kozushima island / Kozushima island (Onbasejima) - Marine. Downloaded from http://www.birdlife.org on 28/06/2022.