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The site was identified as important in 2023 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
Black-polled Yellowthroat Geothlypis speciosa	VU	resident	2012	34 individuals	A1
A4iii Species group - waterbirds	n/a	winter	2018-2022	20,000 individuals	B3b

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2023) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2023. The most recent assessment (2022) is shown below.

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Wetlands (inland)	poor (40-69%)	moderate (70-90%)	very unfavourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Natural system modifications	happening now	whole area/population (>90%)	moderate to rapid deterioration	very high
Agricultural expansion and intensification	happening now	some of area/population (10-49%)	very rapid to severe deterioration	high
Invasive and other problematic species and genes	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high
Pollution	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high
Climate change and severe weather	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high
Geological events	past (and unlikely to return) and no longer limiting	small area/few individuals (<10%)	slow but significant deterioration	low
Transportation and service corridors	happening now	small area/few individuals (<10%)	no or imperceptible deterioration	low
Biological resource use	happening now	some of area/population (10-49%)	no or imperceptible deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Most of site (50-90%) covered (including the most critical parts for important bird species)	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
1988	El Calvario	Parque Municipal	<1
2004	Ciénegas de Lerma	Ramsar Site, Wetland of International Importance	100

Habitat1	Habitat detail	% of IBA
Artificial/Terrestrial	Arable land, Urban parks & gardens	60
Wetlands (inland)	Freshwater marshes & swamps	40

1. IUCN Habitat classification.

Land use	% of IBA
agriculture	65
urban/industrial/transport	34
rangeland/pastureland	-
tourism/recreation	-
fisheries/aquaculture	-

Tenencia de la tierra: Ejidal.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Ciénegas del Lerma (Mexico). Downloaded from https://datazone.birdlife.org/site/factsheet/ciénegas-del-lerma-iba-mexico on 23/11/2024.