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Location Switzerland, Thurgau
Central coordinates 9o 4.00' East  47o 39.00' North
IBA criteria A4i, A4iii, B1i
Area 458 ha
Altitude 380 - 400m
Year of IBA assessment 2000

SVS/BirdLife Switzerland



Summary The IBA includes a large shallow bay with a natural shoreline, including mudbanks, reedbeds and marshy areas. It also covers part of the river Rhine between Lake Constance and Untersee. The Swiss part of a transboundary IBA together with the German IBA «Untersee of Lake Constance» (site DE231). The site holds 20’000 or more waterbirds in winter, on a regular basis. Waterbird numbers are given for the whole bay of Ermatingen including both the Swiss and German IBAs. One of the main threats is disturbance from recreational activities, particularly boating and walking. Hunting is allowed in some places.

Site description Das Gebiet umfasst den schweizerischen Teil des Seerheins von Paradies bis Gottlieben und die schweizerische Bucht des Untersees von Gottlieben bis Ermatingen. Von Gottlieben bis Ermatingen-Stad ist die Uferlinie weitgehend natürlich und Sandbänke, Schwimmblattpflanzen, breite Schilfgürtel, Riedwiesen, Mädesüssfluren und Weichholzauen bilden den Uferbereich. Das IBA «Untersee: Ermatinger Becken» grenzt an das deutsche IBA DE231 «Untersee des Bodensees»34, wo das Wollmatingerried (Land Baden-Württemberg) die gegenüberliegende Buchtseite bildet. Die offene Seefläche in der Region des IBAs bildet eine grosse Flachwasserzone, welche in der Seemitte maximal 2 m tief ist (mit Ausnahme der Rheinrinne). Das Ermatinger Becken ist demnach das grösste Flachwasserbecken mit natürlicher Ufervegetation der Schweiz.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Gadwall Mareca strepera winter  1998  1,700-3,100 individuals  A4i, B1i  Least Concern 
Common Pochard Aythya ferina winter  1998  6,000-9,900 individuals  good  B1i  Least Concern 
Tufted Duck Aythya fuligula winter  1998  7,000-9,700 individuals  good  B1i  Least Concern 
A4iii Species group - waterbirds winter  1998  20,000 individuals  unknown  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Ermatingerbecken Reserves for Waterbirds and Migrants of International and National Importance 426 protected area overlaps with site 426  
Espen Riet / Ermatinger Riet Fenlands of National Importance 52 protected area contained by site 52  
Espen Riet bei Ziegelhof Fenlands of National Importance 5 protected area contained by site 5  
Untersee-Hochrhein Landscapes and Natural Monuments of National Importance 12,482 protected area overlaps with site 442  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater; Water fringe vegetation  51%
Artificial - terrestrial Other urban and industrial areas; Urban parks and gardens  10%
Forest Alluvial and very wet forest; Broadleaved deciduous woodland  2%
Rocky areas Scree & boulders  11%
Grassland Humid grasslands; Mesophile grasslands  23%

Land use

Land-use Extent (% of site)
agriculture 24%
fisheries/aquaculture -
hunting -
tourism/recreation -
urban/industrial/transport 10%

Protection status BLN-Landschaften: Untersee – Hochrhein: wenig im IBA; Flachmoore: 2 Objekte: vollständig im IBA; Wasservogelreservate WZVV: Ermatingerbecken: vollständig im IBA;

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Lake Constance: Bay of Ermatingen. Downloaded from http://www.birdlife.org on 02/08/2014

To provide new information to update this factsheet or to correct any errors, please email BirdLife