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The site was identified as internationally important for bird conservation in 2000 because it was regularly supporting significant populations of the species listed below, meeting IBA criteria.

Populations meeting IBA criteria ('key species') at the site:

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Common Pochard Aythya ferina	VU	winter (1998)	6,000–9,900 individuals	B1i
Tufted Duck Aythya fuligula	LC	winter (1998)	7,000–9,700 individuals	B1i
Gadwall Mareca strepera	LC	winter (1998)	1,700–3,100 individuals	A4i, B1i
A4iii Species group - waterbirds	n/a	winter (1998)	min 20,000 individuals	A4iii

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2000. The most recent assessment (2011) is shown below.

Pressure (threats to the key species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Human intrusions and disturbance	likely in long term (beyond 4 years)	whole popul­ation/area (>90%)	slow deteri­oration (1–10% over 3 gener­ations)	medium
Invasive and other problematic species and genes	happen­ing now	whole popul­ation/area (>90%)	no deteri­oration (<1% over 3 gener­ations)	low
Biological resource use	happen­ing now	some of popul­ation/area (10–49%)	no deteri­oration (<1% over 3 gener­ations)	low

Response (conservation actions taken for the key species and/or their habitats)
Designation	Planning	Action	Result
Whole area of site (>90%) covered by appropriate conservation designation	No manage­ment planning has taken place	Very little or no conservation action taking place	low

Year	Protected Area	Designation (management category)	% coverage of IBA
1983	Untersee-Hochrhein	Landscapes and Natural Monuments of National Importance (V)	97
1991	Ermatinger Becken (TG)	Bundesinventar der Wasser- und Zugvogelreservate von internationaler und nationaler Bedeutung (IV)	93
1996	Espen Riet/Ermatinger Riet	Bundesinventar der Flachmoore von nationaler Bedeutung (IV)	11
1996	Espen Riet bei Ziegelhof	Bundesinventar der Flachmoore von nationaler Bedeutung (IV)	1
2007	Espen Riet	Bundesinventar der Amphibienlaichgebiete von nationaler Bedeutung (IV)	20
2007	Seerhein Chuehorn-Paradies	Bundesinventar der Amphibienlaichgebiete von nationaler Bedeutung (IV)	3

Habitat	% of IBA	Habitat detail
Wetlands (inland)	51	Standing freshwater; Water fringe vegetation
Grassland	23	Humid grasslands; Mesophile grasslands
Rocky areas (eg. inland cliffs, mountain peaks)	11	Scree & boulders
Artificial/Terrestrial	10	Other urban and industrial areas; Urban parks and gardens
Forest	2	Alluvial and very wet forest; Broadleaved deciduous woodland

Land use	% of IBA
agriculture	24
urban/industrial/transport	10
fisheries/aquaculture	-
hunting	-
tourism/recreation	-

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Lake Constance: Bay of Ermatingen (Switzerland). Downloaded from https://datazone.birdlife.org/site/factsheet/lake-constance:-bay-of-ermatingen-iba-switzerland on 22/01/2025.