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Location Canada, Manitoba
Central coordinates 100o 31.23' West  53o 6.06' North
IBA criteria A4i
Area 380 ha
Altitude 0
Year of IBA assessment 2008

Bird Studies Canada/Nature Canada

Site description Dorys Reef is an island in the northern part of Lake Winnipegosis in Manitoba. Lake Winnipegosis is a large (5,403 km2), shallow freshwater lake (maximum depth ~55 m) with many islands. Deciduous and coniferous forests border Lake Winnipegosis, and large expanses of freshwater marsh occur along the lake. The habitats of this island are unrecorded, but are assumed to be as noted here. Also note that the latitude and longitude have not been confirmed.

Key Biodiversity Globally significant numbers of American White Pelican and Common Tern, and continentally significant numbers of Double-crested Cormorant, breed at Dorys Reef. In 1999, there were 1,467 American White Pelicans nesting on the island, which is almost 2% of this species global population. Approximately 1% of the North American population of Common Terns also nest at Dorys Reef; a 1999 survey found 641 Common Tern nests.

Three gull species also nest at this site. In 1999, 164 Ring-billed Gull pairs, 137 California Gull pairs and 25 Herring Gull pairs nested on the island.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
American White Pelican Pelecanus erythrorhynchos breeding  1999  1,467 nests  A4i  Least Concern 


IUCN habitat Habitat detail Extent (% of site)
Forest Temperate deciduous woods  -
Wetlands (inland) Freshwater lakes and pools; Freshwater marshes/swamps  -

Land use

Land-use Extent (% of site)
nature conservation and research major

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Dory's Reef. Downloaded from on 26/10/2016

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