Marais de la baie de L'Isle-Verte

Country/territory: Canada

IBA criteria met: A4i, A4iii (2008)
For more information about IBA criteria, please click here

Area: 4,200 ha

Birds Canada / Nature Canada

Site description (baseline)
Baie de l'Isle-Verte is a cove located beside the town of Saint-Jean-Baptiste de l'Isle-Verte, on the St. Lawrence River estuary, Québec. This town is located approximately 30 km east of Rivière-du-Loup. A National Wildlife Area (NWA) encompassing the marsh (marais) extends along km of shoreline to the west and east of the town, and a smaller Migratory Bird Sanctuary is centred in the middle of the NWA. There is a succession of different habitat types, from the estuarine waters and tidal marshes composed of saltwater cord-grass, to prairies of salt-meadow grass, and finally to coastal alder swamp. Its main feature is a vast marsh dotted with ice extraction pans created by the action of the retreating ice in the spring. This is the site of the largest remaining spartina marsh in southern Quebec. At low tide, the marsh has a minimal and maximal width of 610 m and 1070 m respectively. A constant supply of fresh water to this site is provided by a river and a few brooks.

Key biodiversity
Baie de l'Isle-Verte is a significant site for Greater Snow and Canada Geese. During spring and fall migrations, as many as 27,000 geese have been observed at this site. At the same time, greater than 4,000 Black Ducks (about 4% of the estimated Atlantic flyway population) can be observed at these sites. Other wayterbird migrants include: Green-winged Teals, Northern Pintails, Common Eiders, scoters, gulls and cormorants.

The variety of habitats found within Baie de L'Isle-Verte attract a large number of bird species throughout the year. Within the National Wildlife Area, more than 260 bird species have been recorded, including some rare species, such as Eurasian Widgeon, King Rail, Laughing Gull, Hawk Owl, Marsh Wren and Wilson's Phalarope. The Nelson's Sharp-tailed Sparrow, a species found only locally in Québec, breeds in Baie de L'Isle-Vert. Among the shorebirds that have been recorded are Whimbrel, Greater Yellowlegs, Black-bellied Plover, Semipalmated Plover, Spotted Sandpiper, Hudsonian Godwit, Common Snipe, Pectoral Sandpiper, Least Sandpiper, and Semipalmated Sandpiper. Older breeding season surveys recorded 501 Black Duck ducklings (1968), 386 ducklings (1969), and 167 broods in 1970.

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Marais de la baie de L'Isle-Verte. Downloaded from on 09/06/2023.