Manowar and Rocky Islands

IBA Criteria

Year of most recent IBA criteria assessment: 2009

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Lesser Frigatebird Fregata ariel LC breeding 1991 7,700 breeding pairs A4ii
Brown Booby Sula leucogaster LC breeding 1991 9,000-12,000 breeding pairs A4ii

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2008 high not assessed not assessed
Was the whole site covered? Yes State assessed by unset
Accuracy of information medium

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Human intrusions and disturbance recreational activities happening now whole area/population (>90%) no or imperceptible deterioration low
Invasive and other problematic species and genes invasive non-native/alien species/diseases - named species happening now majority/most of area/population (50-90%) slow but significant deterioration high

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Not assessed Not assessed Not assessed not assessed
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Thuwathu/Bujimulla Indigenous Protected Area 124,966 protected area overlaps with site 0


IUCN Habitat Habitat detail Extent (% of site)
Coastline Sand cays, islets & bars, Sea cliffs, rocky shores & rocky islets -
Sea Open sea -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
fisheries/aquaculture -
other -
For further information about the land use classification please click here.

Land ownership
Traditional owners are Lardil people: Rocky Island known as Kalamburriya, Manowar Island known as Delmerriya or Wudma. Native title exists over the islands.

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Manowar and Rocky Islands. Downloaded from on 18/08/2022.