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The site was identified as internationally important for bird conservation in 2021 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 List	Season (year/s of estimate)	Size	IBA criteria
Brent Goose Branta bernicla	LC	winter (2020)	2,200 birds	B3a
Ridgway's Rail Rallus obsoletus	NT	resident (2020)	45 birds	B1a
Reddish Egret Egretta rufescens	NT	resident (2011)	597 birds	A4, B1a, B3a
Brown Pelican Pelecanus occidentalis	LC	winter (2011)	5,000 birds	A4, B3a
Brandt's Cormorant Urile penicillatus	LC	resident (2020)	2,800 birds	A4, B3a
Snowy Plover Charadrius nivosus	NT	resident (2018)	129 birds	B1a, B3a
Long-billed Curlew Numenius americanus	LC	non-breeding (2017)	2,054 birds	A4, B3a
Marbled Godwit Limosa fedoa	VU	non-breeding (2020)	23,836 birds	A4, B3a
Short-billed Dowitcher Limnodromus griseus	VU	winter (2020)	1,000 birds	B3a
Willet Tringa semipalmata	LC	non-breeding (2020)	6,643 birds	A4, B3a
Heermann's Gull Larus heermanni	NT	resident (2013)	1,108 birds	B1a
Elegant Tern Thalasseus elegans	NT	non-breeding (2013)	300 birds	B1a
Royal Tern Thalasseus maximus	LC	resident (2018)	300 birds	B3a
A4iii Species group - waterbirds	n/a	- (2017–2020)	35,333 birds	B3b

Year	Protected Area	Designation (management category)	% coverage of IBA
1988	El Vizcaíno	Reserva de la Biosfera (Ia)	100
1993	El Vizcaíno	UNESCO-MAB Biosphere Reserve (UA)	100
1993	Whale Sanctuary of El Vizcaino	World Heritage Site (natural or mixed) (UA)	55

Habitat	% of IBA	Habitat detail
Marine Coastal/Supratidal	91
Forest	5	Mangrove
Shrubland	1	Scrub
Marine Intertidal	minor (<10)

Land use	% of IBA
nature conservation and research	100
fisheries/aquaculture	100
tourism/recreation	5
urban/industrial/transport	minor (<10)

Tenencia de la tierra: Ejidal, privada y federal.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Complejo Lagunar San Ignacio (Mexico). Downloaded from https://datazone.birdlife.org/site/factsheet/complejo-lagunar-san-ignacio-iba-mexico on 23/12/2024.