The site was identified as important in 2012 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.Populations meeting IBA criteria ('trigger species'):
|Species||Current IUCN Red List Category||Season||Year(s)||Population estimate at site||IBA criteria met|
|Red-tailed Tropicbird Phaethon rubricauda||LC||breeding||1973-2007||6,500 individuals||A4ii|
|Brown Noddy Anous stolidus||LC||breeding||1973-2007||17,000 individuals||A4i|
|Sooty Tern Onychoprion fuscatus||LC||breeding||1973-2007||360,000 individuals||A4i|
|A4iii Species group - waterbirds||n/a||breeding||1973-2007||380,004 individuals||A4iii|
The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2012).
|Protected area (PA)||PA designation||PA area (ha)||Relationship of PA with IBA||Overlap of PA with IBA (ha)|
|Pacific Remote Islands||Marine National Monument||127,786,000||protected area contains site||0|
|Johnston Island||National Wildlife Refuge||220,278||protected area contains site||286|
|Johnston Atoll||National Wildlife Refuge||229,373||protected area overlaps with site||0|
BirdLife International (2023) Important Bird Area factsheet: Johnston Atoll. Downloaded from http://datazone.birdlife.org/site/factsheet/johnston-atoll-iba-united-states-minor-outlying-islands-(to-usa) on 28/11/2023.