• Summary
• Text account
• Data table and detailed info
• Map
• Reference and further resources

The site was identified as important in 2008 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
Greater Rhea Rhea americana	NT	resident	1991-1998	30 individuals	A1
Coscoroba Swan Coscoroba coscoroba	LC	resident	1991-1998	60-325 individuals	A4i
Black-necked Swan Cygnus melancoryphus	LC	resident	1987-1999	20-1,442 individuals	A4i
Buff-breasted Sandpiper Calidris subruficollis	VU	winter	1999	300 individuals	A1, A4i
Curve-billed Reedhaunter Limnornis curvirostris	LC	resident	1999	uncommon	A3
Straight-billed Reedhaunter Limnoctites rectirostris	NT	resident	1999-2008	90 individuals	A1, A2
Sulphur-throated Spinetail Limnoctites sulphuriferus	LC	resident	1999	present	A3
Bay-capped Wren-spinetail Spartonoica maluroides	LC	resident	1999	90 individuals	A1, A3
Black-and-white Monjita Xolmis dominicanus	VU	resident	1999	90 individuals	A1
Saffron-cowled Blackbird Xanthopsar flavus	EN	resident	1999-2007	90 individuals	A1
A4iii Species group - waterbirds	n/a	unknown	-	20,000-49,999 individuals	A4iii

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2008) may differ.

Year	Protected Area	Designation	% overlap with IBA
-	Humedales del Este	Other Area	100
1966	Laguna de Castillos	Paisaje Protegido	26
1976	Bañados del Este y Franja Costera	UNESCO-MAB Biosphere Reserve	100
1976	Bañados del Este	UNESCO-MAB Biosphere Reserve	100
1984	Bañados del Este y Franja Costera	Ramsar Site, Wetland of International Importance	87
2009	Cabo Polonio	Parque Nacional	2

Habitat1	Habitat detail	% of IBA
Grassland	Campo grassland	major (>10)
Marine Coastal/Supratidal		major (>10)

1. IUCN Habitat classification.

Land use	% of IBA
rangeland/pastureland	major (>10)
tourism/recreation	major (>10)
fisheries/aquaculture	major (>10)

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Castillos Lagoon (Uruguay). Downloaded from https://datazone.birdlife.org/site/factsheet/castillos-lagoon-iba-uruguay on 22/11/2024.