The site was identified as important in 2014 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|
|Yellow-eyed Penguin Megadyptes antipodes||EN||breeding||1999-2001||30-71 breeding pairs||A1, A4ii|
|Southern Red-breasted Plover Charadrius obscurus||CR||breeding||-||present||A1|
|Kakapo Strigops habroptila||CR||resident||-||present||A1|
|New Zealand Kaka Nestor meridionalis||VU||resident||-||present||A1|
The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2014).
|Protected area (PA)||PA designation||PA area (ha)||Relationship of PA with IBA||Overlap of PA with IBA (ha)|
|Rakiura National Park||National Park||140,359||protected area overlaps with site||0|
|Habitat (IUCN level 1)||Habitat detail||Extent (% of site)|
BirdLife International (2023) Important Bird Area factsheet: Port Pegasus. Downloaded from http://datazone.birdlife.org/site/factsheet/port-pegasus-iba-new-zealand on 25/09/2023.