IBA Sagemace & Coleman Bay Islands
Southern Lake Winnipegosis, Manitoba
Site Summary
MB081 Latitude
51.882° N
100.039° W
253 m
181.09 km²
coniferous forest (temperate), deciduous woods (temperate), mixed woods (temperate), scrub/shrub, native grassland, freshwater lake, freshwater marsh, coastal cliffs/rocky shores (marine)
Land Use:
Nature conservation and research, Fisheries/aquaculture, Hunting
Potential or ongoing Threats:
Disturbance, Persecution, Recreation/tourism
IBA Criteria: Nationally Significant: Congregatory Species, Wading Bird Concentrations
Conservation status:
Restricted access for IBA coordinators
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Site Description
Sagemace Bay is located in the southern portion of Lake Winnipegosis, Manitoba, north of the community of Camperville and south of Winnipegosis. This site includes all the islands in the Sagemace and Coleman Bays. The Red Deer Point peninsula borders the IBA to the east and contains a diversity of habitats including shallow alkaline lakes and cattail marshes. Lake Winnipegosis is a large (5,403 km²), shallow (maximum depth ~55 m), freshwater lake with many small islands. Deciduous and coniferous forests border Lake Winnipegosis while large expanses of freshwater marsh occur along the lake. The surrounding forests are home to many mammals, including Black Bear and White-tailed Deer.
Sugar Island, in Sagemace Bay, supports high numbers of breeding Great Blue Herons. This Great Blue Heron colony has been existence for at least three decades. A 1986 survey found 300 nests on Sugar Island, which was almost 1% of this species Canadian population. Large numbers of Double-crested Cormorants also breed on the Sagemace and Coleman Bay islands. In 1986, 975 nests were found on two islands in Coleman Bay, and 20 nests were found on an island in Sagemace Bay.

Sagemace Bay is also a traditional molting and staging area for diving ducks, especially Redheads and, to a lesser degree, Canvasbacks. Unfortunately, exact numbers of these ducks have never been documented.

IBA Criteria
SpeciesT | A | I Links Date Season Number G C N
Note: species shown in bold indicate that the maximum number exceeds at least one of the IBA thresholds (sub-regional, regional or global). The site may still not qualify for that level of IBA if the maximum number reflects an exceptional or historical occurrence.
Conservation Issues
Colonial waterbirds nesting in Lake Winnipegosis face several problems. Some residents whose livelihood depends on fishing feel that the birds, especially cormorants, are eating too many fish. As a result, birds are sometimes shot, or nests are destroyed.

The IBA Program is an international conservation initiative coordinated by BirdLife International. The Canadian co-partners for the IBA Program are Birds Canada and Nature Canada.
   © Birds Canada