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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
Elegant Tern Thalasseus elegans	NT	non-breeding (2015)	40 birds	B1a
Belding's Yellowthroat Geothlypis beldingi	VU	resident (2015)	35 birds	A1

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 (<4 years)	whole of popul­ation/area (>90%)	rapid decline (>30% over 3 gener­ations)	very high
Natural system modifications	happe­ning now	most of popul­ation/area (50–90%)	slow decline (1–10% over 3 gener­ations)	high
Human intrusions and disturbance	happe­ning now	some of popul­ation/area (10–49%)	rapid decline (>30% over 3 gener­ations)	high
Residential and commercial development	likely in short term (<4 years)	some of popul­ation/area (10–49%)	rapid decline (>30% over 3 gener­ations)	high
Agricultural expansion and intensification	likely in short term (<4 years)	some of popul­ation/area (10–49%)	rapid decline (>30% over 3 gener­ations)	high

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Whole area (>90%) covered by appropriate conservation designation	A management plan exists, but it is out of date or not compre­hensive	Some limited conservation initiatives are in place	medium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 (management category)	% coverage of IBA
1994	Estero de San Jose	Natural Resources Protection Area (-)	100

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

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 27/12/2024.