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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
Brent Goose Branta bernicla	LC	winter (1997)	4,947–8,745 individuals	A4i, B1i, C3
Brent Goose Branta bernicla	LC	passage (1997)	1,000–10,000 individuals	A4i, B1i, C3
Common Shelduck Tadorna tadorna	LC	winter (1997)	1,728–4,445 individuals	A4i, B1i, C3
Northern Shoveler Spatula clypeata	LC	winter (1997)	32–514 individuals	B1i, C3
Northern Shoveler Spatula clypeata	LC	breeding (1997)	400–450 breeding pairs	B1i, C3
Little Egret Egretta garzetta	LC	breeding (1997)	310 breeding pairs	B1i, C2, C6
Pied Avocet Recurvirostra avosetta	LC	winter (1997)	1,450–1,788 individuals	A4i, B1i, B2, C2
Pied Avocet Recurvirostra avosetta	LC	breeding (1997)	284–404 breeding pairs	A4i, B1i, B3, C2, C6
Black-winged Stilt Himantopus himantopus	LC	breeding (1995)	212–249 breeding pairs	A4i, B1i, C2, C6
Grey Plover Pluvialis squatarola	VU	winter (1997)	1,578–6,110 individuals	A4i, B1i, C3
Grey Plover Pluvialis squatarola	VU	passage (1997)	3,000 individuals	A4i, B1i, C3
Eurasian Curlew Numenius arquata	NT	winter (1997)	700–3,530 individuals	A4i, B1i, B2, C3
Bar-tailed Godwit Limosa lapponica	NT	winter (1997)	42–1,090 individuals	A4i, B1i, B2, C2
Bar-tailed Godwit Limosa lapponica	NT	passage (1997)	1,500 individuals	A4i, B1i, C2
Dunlin Calidris alpina	NT	winter (1997)	4,853–15,582 individuals	B1i, B2, C3
Dunlin Calidris alpina	NT	passage (1997)	10,000–20,000 individuals	B1i, C3
Common Redshank Tringa totanus	LC	breeding (1997)	676–816 breeding pairs	B1i, C3
Common Tern Sterna hirundo	LC	breeding (1997)	42–50 breeding pairs	C6
Short-eared Owl Asio flammeus	LC	breeding (1995)	2–5 breeding pairs	C6
Western Marsh-harrier Circus aeruginosus	LC	breeding (1997)	80–120 breeding pairs	C6
Montagu's Harrier Circus pygargus	LC	breeding (1995)	50–100 breeding pairs	B3, C6
Black Kite Milvus migrans	LC	breeding (1995)	10–30 breeding pairs	C6
Bluethroat Luscinia svecica	LC	breeding (1995)	500–600 breeding pairs	C6
A4iii Species group - waterbirds	n/a	passage (1997)	20,000-49,999 individuals	A4iii, C4
A4iii Species group - waterbirds	n/a	winter (1997)	20,000-49,999 individuals	A4iii, C4

Year	Protected Area	Designation (management category)	% coverage of IBA
-	Baie de Bourgneuf	Hunting Reserve (-)	9
-	LPO-BirdLife Parcels	Private Reserve (-)	1
2004	MARAIS BRETON - BEAUVOIR	Terrain acquis par le Conservatoire du Littoral (IV)	<1
2008	Polder de Sébastopol	Réserve naturelle régionale (IV)	<1
2010	MARAIS BRETON - BOUIN	Terrain acquis par le Conservatoire du Littoral (IV)	<1

Habitat	% of IBA	Habitat detail
Grassland	-	Humid grasslands
Marine Coastal/Supratidal	-
Marine Intertidal	-
Marine Neritic	-

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

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Baie de Bourgneuf et marais breton (France). Downloaded from https://datazone.birdlife.org/site/factsheet/baie-de-bourgneuf-et-marais-breton-iba-france on 13/01/2025.