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The site was identified as important 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 List1	Season	Year(s)	Size	IBA criteria
Elegant Tern Thalasseus elegans	NT	non-breeding	2015	40 individuals	B1a
Belding's Yellowthroat Geothlypis beldingi	VU	resident	2015	35 individuals	A1

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2021) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2021. The most recent assessment (2013) is shown below.

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

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Whole area of site (>90%) covered by appropriate conservation designation	A management plan exists but it is out of date or not comprehensive	Some limited conservation initiatives are in place	medium

Year	Protected Area	Designation	% overlap with IBA
1994	Estero San José del Cabo	Zona Sujeta Conservación Ecologica-Res Ecol Estata	3
1994	Estero de San Jose	Natural Resources Protection Area	100
2008	Sistema Ripario de la Cuenca y Estero de San José del Cabo	Ramsar Site, Wetland of International Importance	53

Habitat1	Habitat detail	% of IBA
Shrubland	Scrub	64
Marine Coastal/Supratidal		19
Forest	Gallery & riparian	8
Marine Intertidal		-

1. IUCN Habitat classification.

Land use	% of IBA
nature conservation and research	25
agriculture	7
urban/industrial/transport	1
tourism/recreation	-

Tenencia de la tierra: Ejidal, privada y federal.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Estero de San José (Mexico). Downloaded from https://datazone.birdlife.org/site/factsheet/estero-de-san-josé-iba-mexico on 23/11/2024.