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Location Tonga
Central coordinates 176o 12.47' West  22o 20.39' South
IBA criteria A4ii, A4iii
Area 1,811,541 ha
Altitude
Year of IBA assessment 2012





Summary The site boundary is based upon a seaward extension of 15 km around Ata Island to encompass the foraging range or high use and transit areas of IBA threshold numbers of seabirds based upon a 1990 population estimate of 31,000 - 61,000 individuals and waterbirds based upon a 1990 population estimate of 20,000 individuals from Rinke, D. (1991) Birds of 'Ata and Late, and additional notes on the avifauna of Niuafo'ou, Kingdom of Tonga. Notornis, 38: 131-151.

Site description The site boundary is based upon a seaward extension of 15 km around Ata Island to encompass the foraging range or high use and transit areas of IBA threshold numbers of seabirds based upon a 1990 population estimate of 31,000 - 61,000 individuals and waterbirds based upon a 1990 population estimate of 20,000 individuals from Rinke, D. (1991) Birds of 'Ata and Late, and additional notes on the avifauna of Niuafo'ou, Kingdom of Tonga. Notornis, 38: 131-151.

Key Biodiversity The site boundary is based upon a seaward extension of 15 km around Ata Island to encompass the foraging range or high use and transit areas of IBA threshold numbers of seabirds based upon a 1990 population estimate of 31,000 - 61,000 individuals and waterbirds based upon a 1990 population estimate of 20,000 individuals from Rinke, D. (1991) Birds of 'Ata and Late, and additional notes on the avifauna of Niuafo'ou, Kingdom of Tonga. Notornis, 38: 131-151.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Wedge-tailed Shearwater Ardenna pacifica breeding  1990  20,000-50,000 individuals  poor  A4ii  Least Concern 
Red-footed Booby Sula sula breeding  1990  10,000 individuals  poor  A4ii  Least Concern 
Brown Booby Sula leucogaster breeding  1990  1,000-10,000 individuals  poor  A4ii  Least Concern 
A4iii Species group - waterbirds breeding  1990  20,000 individuals  good  A4iii   
A4iii Species group - seabirds breeding  1990  31,000-61,000 individuals  good  A4iii   

IBA Monitoring

2012 medium favourable negligible
Habitat
Poor - based on little, or potentially unreliable/unrepresentative, data

Climate change and severe weather habitat shifting and alteration likely in long term (beyond 4 years) whole area/population (>90%) no or imperceptible deterioration low
Pollution excess energy - light pollution happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution industrial & military effluents - oil spills happening now some of area/population (10-49%) no or imperceptible deterioration low

Sea   0 0 good (> 90%) good (> 90%) favourable

Little/none of site covered (<10%)  No management planning has taken place  Very little or no conservation action taking place  negligible 

Habitats

IUCN habitat Habitat detail Extent (% of site)
Sea Coral reefs and lagoons; Marine areas; Shallow marine waters  100%

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Ata Island Marine. Downloaded from http://www.birdlife.org on 29/12/2014

To provide new information to update this factsheet or to correct any errors, please email BirdLife