This Marine IBA is identified using both tracking data and seaward extensions around breeding colonies. It falls within the Japan Exclusive Economic Zone (EEZ) and the Pacific, Northwest FAO ocean region. The site covers an area of 197 km2 and is 480 km away from the closet coastline. The depth ranges from 0 to 1044 m, mean annual sea surface temperature falls between 23.11 and 23.17 °C and mean annual chlorophyll-a concentrations found to range between 0.15 and 0.17 mg/m3.
2 species trigger IBA criteria at this Marine IBA. BirdLife analyses of tracking data estimates that 92-780 individuals of Short-tailed Albatross (VU) from Izu Shoto are present at the site during the Post-guard (Feb-Jun) life-history stage. Seaward extensions around breeding colony; Torishima island include key near-colony areas for breeding populations of Japanese Murrelet (VU).
BirdLife International (2019) Important Bird Areas factsheet: Torishima island / sta_izs_pg_2 - Marine. Downloaded from http://www.birdlife.org on 15/12/2019.