Wildwood Gull Roost

Country/territory: Canada

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

Area: 1,100 ha

Birds Canada / Nature Canada

Site description
Wildwood Conservation Area is located southwest of Stratford and east of the town of St. Marys, Ontario. The Conservation Area extends across the broad valley of Trout Creek. The valley slopes are covered in White Pine and White Spruce plantations, or have been left to regenerate naturally. There is little natural forest, as most of the unplanted slopes are undergoing succession from old field and hawthorn pasture stages.

Wildwood Reservoir is an impoundment of Trout Creek, a tributary from the north branch of the Thames River. The reservoir is a 9.2 km long, S-shaped lake with a summer surface area of approximately 385 ha. At the east end of the reservoir is an impoundment created by Ducks Unlimited. Beginning in late August the reservoir is drawn down to create space for fall rains and winter snow melt.

Key biodiversity
Large numbers of Ring-billed Gulls begin roosting on Wildwood Reservoir in late summer. In 1993, as many as 100,000 birds were observed on the lake at the end of August, while 110,000 were reported in October 1994. This latter figure represents about 6% of the estimated global population for this species. In November, Herring Gulls begin arriving at the site, and by December the Ring-billed Gulls have moved on. The Herring Gulls generally remain until freeze-up, although they sometimes can be found throughout the winter. In November 1998, 38,000 birds were recorded on the lake, representing 15% of the estimated North American Herring Gull population. These gulls are often accompanied during the winter months by Great Black-backed Gulls (maximum 100+), Glaucous Gulls (maximum 5-10), Iceland Gulls (max 5-10), and Lesser Black-backed Gulls (maximum 1-3). It is speculated that these gulls may be from Lake Huron and remain all winter, depending on the extent of ice on Lake Huron. When Wildwood Lake is frozen they may roost on Lake Huron, but will continue to come inland to feed and congregate on the ice on Wildwood Lake during the day.

American Black Ducks and Mallards can also be found during fall migration in large numbers. Approximately 5% of the estimated Mississippi Flyway population of American Black Ducks has been recorded here, and up to 15,000 Mallards have been observed. In addition, as many as 2,000 shorebirds are attracted to the extensive mudflats created when the reservoir is drawn down early in the fall.

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Wildwood Gull Roost. Downloaded from on 25/03/2023.