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The site was identified as important in 1999 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
Running Coua Coua cursor	LC	resident	1997	present	A2, A3
Verreaux's Coua Coua verreauxi	LC	resident	1997	present	A1, A2, A3
Olive-capped Coua Coua olivaceiceps	LC	resident	1997	present	A3
Archbold's Newtonia Newtonia archboldi	LC	resident	1997	present	A2, A3
Red-shouldered Vanga Calicalicus rufocarpalis	VU	resident	1997	present	A2, A3
Lafresnaye's Vanga Xenopirostris xenopirostris	NT	resident	1997	present	A2, A3
Sickle-billed Vanga Falculea palliata	LC	resident	1997	present	A3
Subdesert Brush-warbler Nesillas lantzii	LC	resident	1997	present	A2, A3
Sakalava Weaver Ploceus sakalava	LC	resident	1997	present	A3

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (1999) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 1999. The most recent assessment (2017) is shown below.

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Forest	moderate (70-90%)	moderate (70-90%)	unfavourable
Wetlands (inland)	good (> 90%)	good (> 90%)	favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Residential and commercial development	happening now	majority/most of area/population (50-90%)	very rapid to severe deterioration	very high
Human intrusions and disturbance	likely in long term (beyond 4 years)	majority/most of area/population (50-90%)	very rapid to severe deterioration	high
Biological resource use	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Whole area of site (>90%) covered by appropriate conservation designation	A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species	The conservation measures needed for the site are being comprehensively and effectively implemented	high

Year	Protected Area	Designation	% overlap with IBA
2017	Zones humides de l'Onilahy	Ramsar Site, Wetland of International Importance	24

Habitat1	Habitat detail	% of IBA
Shrubland	Bushland & thicket - deciduous	major (>10)
Forest	Mangrove	minor (<10)
Marine Intertidal		minor (<10)
Wetlands (inland)	Rivers & streams	minor (<10)

1. IUCN Habitat classification.

Land use	% of IBA
unknown	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Saint Augustin Forest (Madagascar). Downloaded from https://datazone.birdlife.org/site/factsheet/saint-augustin-forest-iba-madagascar on 23/11/2024.