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The site was identified as important in 2004 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
Blue-tailed Imperial-pigeon Ducula concinna	LC	resident	2000	present	A2
Siau Scops-owl Otus siaoensis	CR	resident	2001	present	A1
Cittura cyanotis	NR	resident	2000	present	A2
Red-and-blue Lory Eos histrio	EN	resident	2004	present	A1, A2
Elegant Sunbird Aethopyga duyvenbodei	EN	resident	2004	present	A1, A2

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2004) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2004. The most recent assessment (2016) is shown below.

State (condition of the trigger species' populations)
Species	Reference	Actual	Units	% remaining	Result
Siau Island Tarsier Tarsius tumpara	12,470	5,501	individuals	45	unfavourable
Siau Scops-owl Otus siaoensis	1	0	-	0	very unfavourable

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Artificial/Terrestrial	-	poor (40-69%)	very unfavourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Biological resource use	happening now	whole area/population (>90%)	very rapid to severe deterioration	very high
Geological events	likely in short term (within 4 years)	majority/most of area/population (50-90%)	very rapid to severe deterioration	high
Natural system modifications	happening now	some of area/population (10-49%)	very rapid to severe deterioration	high
Agricultural expansion and intensification	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high
Climate change and severe weather	likely in short term (within 4 years)	whole area/population (>90%)	slow but significant deterioration	high

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Little/none of site covered (<10%)	No management planning has taken place	Very little or no conservation action taking place	negligible

Habitat1	Habitat detail	% of IBA
Forest		27
Artificial/Terrestrial		-

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Pulau Siau (Indonesia). Downloaded from https://datazone.birdlife.org/site/factsheet/pulau-siau-iba-indonesia on 23/11/2024.